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Glenn Daehn

  • Fontana Professor, Materials Science Engineering
  • 2041 College Rd
    Columbus, OH 43210
  • 614-292-6779

Honors

  • January, 2009

    Innovators Award of Ohio State College of Engineering.

  • January, 2007

    ASM Jacquet-Lucas Award for Excellence in Metallography.

  • January, 2004

    Lumley Research Award of Ohio State University College of Engineering.

  • January, 2000

    Lumley Research Award of Ohio State University College of Engineering.

  • January, 1994

    Winner of conference best paper award, Ceramic Entineering and Science.

  • January, 1992

    National Young Investigator.

  • January, 1992

    Lumley Research Award of Ohio State University College of Engineering.

  • January, 1992

    Robert Lansing Hardy Gold Medal of TMS.

  • January, 1992

    Army Research Office Young Investigator Award.

  • January, 1990

    ASM Marcus A. Grossmann Young Author Award.

Chapters

2005

  • 2005. "High Velocity Metal Forming." In ASM Handbook, Volume 14B, Metalworking: Sheet Forming,

1996

  • 1996. "Modeling of Enhanced Composite Creep and Plastic Flow in Temperature Cycling." In (invited chapter) Numerical Analysis and Modeling of Composite Materials, edited by J. W. Bull,

1995

  • 1995. "Hyperplasticity - A Competitor to Superplastic Sheet Forming?." In Superplasticity and Superplastic Forming, edited by A. K. Ghosh and T. R. Bieler,

1994

  • 1994. "Effects of Transformation and Chemistry on the Microstructure and Properties of Co Continuous Ceramic Composite Materials." In Composite Materials: Commonalty of Phenomenon, Proceedings of TMS Annual Meeting, edited by K. K. Chawla, P. K. Liaw and S. G. Fishman,

Journal Articles

2020

  • Li, J.; Schneiderman, B.; Gilbert, S.M.; Vivek, A. et al., 2020, "Process characteristics and interfacial microstructure in spot impact welding of titanium to stainless steel." Journal of Manufacturing Processes 50, 421-429 - 421-429.

2019

  • Lee, T.; Zhu, M.; Dittrich, T.; Hwang, J. et al., 2019, "Microstructural Investigation of the Impact Weld Interface of Pseudo Single Grained Cu and Ag." Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
  • Su, S.; Chen, S.; Xiao, J.; Mao, Y. et al., 2019, "Study on Vaporizing Foil ActuatorWelding Process of 5A06/0Cr18Ni10Ti with Interlayer." Jinshu Xuebao/Acta Metallurgica Sinica 55, no. 8, 1041-1048 - 1041-1048.
  • Thurston, B.P.; Vivek, A.; Nirudhoddi, B.S.L.; Daehn, G.S., 2019, "Vaporizing foil actuator welding." MRS Bulletin 44, no. 8, 637-641 - 637-641.

2018

  • Chen, S.; Su, S.; Xiao, J.; Mao, Y. et al., 2018, "Flyer Impact Velocity in Vaporizing Foil Actuator Welding Process and Its Influencing Factors." Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering 47, no. 11, 3439-3443 - 3439-3443.
  • Daehn, G.S.; Taub, A., 2018, "Metamorphic manufacturing: The third wave in digital manufacturing." Manufacturing Letters

2016

  • Wang, H.; Vivek, A.; Wang, Y.; Taber, G. et al., 2016, "JLA." LIA Today 24, no. 5, 25 - 25.
  • Y. Lu, H. Song, G. A. Taber, D. R. Foster, G. S. Daehn and Wei Zhang, 2016, "In-Situ Measurement of Relative Motion during Ultrasonic Spot Welding of Aluminum Alloy using Photonic Doppler Velocimetry." Journal of Materials Processing Technology 231, 431-440 - 431-440.

2012

  • Brandes,M,C; Kovarik,L; Miller,M,K; Daehn,G,S; Mills,M,J, 2012, "Creep behavior and deformation mechanisms in a nanocluster strengthened ferritic steel." ACTA MATERIALIA 60, no. 4, 1827-1839 - 1827-1839.

2010

  • Unocic,K,A; Mills,M,J; Daehn,G,S, 2010, "Effect of gallium focused ion beam milling on preparation of aluminium thin foils." JOURNAL OF MICROSCOPY 240, no. 3, 227-238 - 227-238.
  • Unocic,Kinga,A; Hayes,Robert,W; Mills,Michael,J; Daehn,Glenn,S, 2010, "Microstructural Features Leading to Enhanced Resistance to Grain Boundary Creep Cracking in ALLVAC 718Plus." METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 41A, no. 2, 409-420 - 409-420.

2009

  • Johnson,Jason,R; Taber,Geoff; Vivek,Anupam; Zhang,Yuan; Golowin,Scott; Banik,Kristin; Fenton,Gregg,K; Daehn,Glenn,S, 2009, "Coupling Experiment and Simulation in Electromagnetic Forming Using Photon Doppler Velocimetry." STEEL RESEARCH INTERNATIONAL 80, no. 5, 359-365 - 359-365.

2008

  • Daehn,Glenn,S; Unocic,Kinga,A, 2008, "TEM sample preparation method for grain boundary phase identification in Al-Mg alloys." ADVANCED MATERIALS & PROCESSES 166, no. 2, 42-43 - 42-43.
  • Daehn, G.S.; Unocic, K.A., 2008, "Jacquet-Lucas Award: TEM sample preparation method for grain boundary phase identification in Al-Mg alloys." Advanced Materials and Processes 166, no. 2, 42-43 - 42-43.

2007

  • Golowin, S.; Kamal, M.; Shang, J.; Portier, J. et al., 2007, "Application of a uniform pressure actuator for electromagnetic processing of sheet metal." Journal of Materials Engineering and Performance 16, no. 4, 455-460 - 455-460.
  • Kamal,Manish; Daehn,Glenn,S, 2007, "A uniform pressure electromagnetic actuator for forming flat sheets." JOURNAL OF MANUFACTURING SCIENCE AND ENGINEERING-TRANSACTIONS OF THE ASME 129, no. 2, 369-379 - 369-379.

2006

  • Gan,Wei; Zhang,Peihui; Wagoner,Robert,H; Daehn,Glenn,S, 2006, "Effect of load redistribution in transient plastic flow." METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 37A, no. 7, 2097-2106 - 2097-2106.
  • S. B. Alapati, W. A. Brantley, J. M. Nussten, G. S. Daehn, T. A. Svec, J. M. Powers, W. M. Johnston, W. Gao, 2006, "Vickers hardness investigation of work-hardening in used NiTi rotary instruments." Journal of Endodontics 32, 1191-1193 - 1191-1193.

2005

  • Gan,W; Zhang,P,H; Wagoner,R,H; Daehn,G,S, 2005, "Transient plastic flow at nominally fixed structure due to load redistribution." ZEITSCHRIFT FUR METALLKUNDE 96, no. 6, 572-577 - 572-577.

2003

  • Miles, M.P.; Daehn, G.S.; Wagoner, R.H., 2003, "Prediction of limit strains in superplastic materials." Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science 34 A, no. 11, 2559-2564 - 2559-2564.
  • Miles,M,P; Daehn,G,S; Wagoner,R,H, 2003, "Prediction of limit strains in superplastic materials." METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 34A, no. 11, 2559-2564 - 2559-2564.
  • Xin,X,J; Jayaraman,P; Daehn,G,S; Wagoner,R,H, 2003, "Investigation of yield surface of monolithic and composite powders by explicit finite element simulation." INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 45, no. 4, 707-723 - 707-723.
  • Jiang,G; Daehn,G,S; Wagoner,R,H, 2003, "Observations on densification of Al-Al2O3 composite powder compacts by pressure cycling." POWDER METALLURGY 46, no. 1, 78-82 - 78-82.

2002

  • Fu,Y; Jiang,G; Lannutti,J,J; Wagoner,R,H; Daehn,G,S, 2002, "Effect of cyclic pressure consolidation on the uniformity of metal matrix composites." METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 33, no. 1, 183-191 - 183-191.
  • Mills, MJ; Neeraj, T; Savage, MF; Tatalovich, J; Daehn, GS, 2002, "Deformation mechanisms during creep of titanium alloys at lower temperatures." CREEP DEFORMATION: FUNDAMENTALS AND APPLICATIONS 389-398 - 389-398.
  • Turner, A; Zhang, PH; Vohnout, V; Daehn, G, 2002, "Spot impact welding of sheet aluminum." ALUMINUM ALLOYS 2002: THEIR PHYSICAL AND MECHANICAL PROPERTIES PTS 1-3 396-4, 1573-1578 - 1573-1578.

2001

  • Jiang,G; Daehn,G,S; Lannutti,J,J; Fu,Y; Wagoner,R,H, 2001, "Effects of lubrication and aspect ratio on the consolidation of metal matrix composites under cyclic pressure." ACTA MATERIALIA 49, no. 8, 1471-1477 - 1471-1477.
  • Jiang,G; Daehn,G,S; Wagoner,R,H, 2001, "Inclusion particle size effects on the cyclic compaction of powder composites." SCRIPTA MATERIALIA 44, no. 7, 1117-1123 - 1117-1123.
  • Jiang,G; Daehn,G,S; Wagoner,R,H, 2001, "Void filling and cluster breaking of metal-ceramic composites under pressure cycling." SCRIPTA MATERIALIA 44, no. 2, 287-292 - 287-292.

2000

  • Jiang,G; Wu,W; Daehn,G,S; Wagoner,R,H, 2000, "Experimental and numerical investigation of idealized consolidation - Part II: Cyclic compaction." ACTA MATERIALIA 48, no. 17, 4331-4335 - 4331-4335.
  • W. Wu, G. Jiang, R. H. Wagoner and G. S. Daehn, 2000, "Experimental and Numerical Investigations of Idealized Solid State Consolidation." Acta Mater 48, no. 17, 4323-4330 - 4323-4330.
  • Neeraj,T; Hou,D,H; Daehn,G,S; Mills,M,J, 2000, "Phenonomenological and microstructural analysis of room temperature creep in titanium alloys." ACTA MATERIALIA 48, no. 6, 1225-1238 - 1225-1238.
  • Carroll,M,C; Gouma,P,I; Mills,M,J; Daehn,G,S; Dunbar,B,R, 2000, "Effects of Zn additions on the grain boundary precipitation and corrosion of Al-5083." SCRIPTA MATERIALIA 42, no. 4, 335-340 - 335-340.

1999

  • X. J. Xin, R. H. Wagoner and G. S. Daehn, 1999, "A Numerical Method to Solve for General Dislocation Configurations: The Finite Segment Method." Materials Transactions, 30A 2073-2087 - 2073-2087.
  • Xin,X,J; Wagoner,R,H; Daehn,G,S, 1999, "A general numerical method to solve for dislocation configurations." METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 30, no. 8, 2073-2087 - 2073-2087.

1998

  • X. J. Xin, R. H. Wagoner and G. S. Daehn, 1998, "Finite Segment Method for Dislocation Mechanics." Scripta Mater 39, 397-407 - 397-407.
  • Xin,X,J; Daehn,G,S; Wagoner,R,H, 1998, "Modeling the generation equilibrium, and emission of dislocations at elastically misfitted particles." ACTA MATERIALIA 46, no. 17, 6131-6144 - 6131-6144.

1997

  • S. Suri, T. Neeraj, G. S. Daehn, D-H Hou, J. M. Scott, R. W. Hayes and M. J. Mills, 1997, "Mechanisms of Primary Creep in ï�¡ï€¯ï�¢ Titanium Alloys at Lower Temperatures." Materials Science and Engineering A 996-999 - 996-999.
  • Xin,X,J; Daehn,G,S; Wagoner,R,H, 1997, "Equilibrium configuration of coaxial prismatic dislocation loops and related size-dependent plasticity." ACTA MATERIALIA 45, no. 5, 1821-1836 - 1821-1836.
  • A. A. Tamnane, V. J. Vohnout, M. Padmanabhan, G. Fenton, V. S. Balanethiram, M. Altynova and G. S. Daehn, 1997, "Opportunities in the High Velocity Forming of Sheet Metal." Metal Forming 42-49 - 42-49.
  • A.A. Tamhane, M. Padmanabhan, G. Fenton, M. Altynova and G. S. Daehn, 1997, "Opportunities in High Velocitiy Forming of Sheet Metal." Metal Forming 42-49 - 42-49.

1994

  • L. Xu and G. S. Daehn, 1994, "Allegatoring and Damage in the Cold Rolling of Spheroidized Steels." Metallurgical Transactions 25A, 589-98 - 589-98.
  • X. Hu, R. H. Wagoner, G. S. Daehn and S. Ghosh, 1994, "Comparison of Explicit and Implicit Finite Element Methods in the Quasistatic Simulation of Uniaxial Tension." Communications in Numerical Methods in Engineering 10, 993-1003 - 993-1003.
  • X. Hu, R. H. Wagoner, G. S. Daehn and S. Ghosh, 1994, "The Effect of Inertia on Tensile Ductility." Metallurgical Transactions 25A, 2723-35 - 2723-35.

1993

  • A. L. Marasco, J. Ringnalda, M. C. Breslin, G. S. Daehn and H. L. Fraser, 1993, "Transformation Kinetics and Properties of Co-Continuous Ceramic Composites." TMS

1991

  • H. Zhang, G. S. Daehn and R. H. Wagoner, 1991, "Simulation of the Plastic Response of Whisker Reinforced Metal-Matrix Composites Under Thermal Cycling Conditions." Scripta Metallurgica 25, 2279-84 - 2279-84.

1990

  • G. S. Daehn, H. Zhang, R. H. Wagoner, 1990, "The Temperature-Cycling Deformation of Particle Reinforce Metal Matrix Composites -- A Finite Study." Scripta Metallurgica et Materialia 24, 2151-2155 - 2151-2155.
  • Y. C. Chen, G. S. Daehn and R. H. Wagoner, 1990, "The Potential for Forming Metal Matrix Composites Via Thermal Cycling." Scripta Metallurgica et Materialia 24, 2157-2162 - 2157-2162.

Papers in Proceedings

2018

  • Liu, B.; Palazotto, A.; Vivek, A.; Daehn, G.S. "Impact welding of wrought and additively manufactured 15-5 PH stainless steel." (1 2018).

2017

  • Vivek, A.; Daehn, G.; Mao, Y.; Liu, B. et al. "Impact welding of automotive materials with vaporizing foil actuator welding." (1 2017).

2016

  • Mao, Y.; Kapil, A.; Taber, G.; Vivek, A. et al. "Impact spot welding of aluminum alloy 5052-H32 to dual phase 590 steel by vaporizing foil actuator." (1 2016).
  • Polasik, A.K.; Daehn, G.S.; McCombs, M.R. "Implementation of materials science in the high school classroom." (6 2016).

2015

  • Vivek, A.; Liu, B.; Sakkinen, D.; Harris, M. et al. "Impact Welding of Aluminum Alloy 6061 to Dual Phase 780 Steel Using Vaporizing Foil Actuator." (1 2015).
  • Liu, B.; Vivek, A.; Daehn, G.S. "Use of vaporizing foil actuator for impact welding of aluminum alloy sheets with steel and magnesium alloys." (1 2015).

2014

  • Boos, K.N.; Vivek, A.; Hansen, S.R.; Liu, B.C. et al. "Solid state impact welds between dissimilar metals utilizing vaporizing foil actuators: A microstructural evaluation." (1 2014).

2009

  • J. R. Johnson, G. K. Fenton, G. Taber, A. Vivek and G. S. Daehn "High Strain Rate Constitutive Relations and Ductility Parameters via Electromagnetic Launch and Velocimetry." in Proceedings International Deep Drawing Research Group, Golden CO. (1 2009).

2008

  • Y. Zhang, P. L’Eplattenier, G. Taber, A. Vivek, G. S. Daehn and S. Babu "Numerical Simulation and Experimental Study for Magnetic Pulse Welding Process on AA6061-T6 and Cu101 Sheet." in 10th International LS-DYNA Users Conference. (1 2008).
  • I. Henchi, P. L’Eplattenier, G. S. Daehn, Y. Zhang, A. Vivek and N. Stander "Material Constitutive Parameter Identification Using an Electromagnetic Ring Expansion Experiment Coupled with LS-DYNA and LS-OPT." in 10th International LS-DYNA Users Conference. (1 2008).
  • P. Jimbert, I. Eguia, M. A. Gutierrez, B. Gonzalez, G. S. Daehn, Y. Zhang, R. Andersson, H. Sundberg, S. O. Olsson, P. Brännström "Flanging and Hemming Auto Body Panels using Electromagetic Forming." in Proceedings of Third International Conference on High Speed Forming. (1 2008).

2007

  • G.S. Daehn "Agile Sheet Metal Forming: Basic Concepts and the Role of Electromagnetic Metal Forming." in Proceedings from IDDRG 2007. (5 2007).
  • Jimbert, P.; Perez, I.; Eguia, I.; Daehn, G. "Straight hemming of aluminum sheet panels using the electromagnetic forming technology: First approach." (5 2007).
  • P. Jimbert et. al. "Hemming of Aluminum Sheet Panels Using the Electromagnetic Forming Technology." in Proceedings from IDDRG 2007. (5 2007).

2006

  • P. Jimbert, A. Arroyo, I. Eguia, J. I. Fernandez, E. Silveria, I Garuz and G. S. Daehn "Efficiency Improvement and Analysis of Microstructure Associated with Use of a Uniform Pressure Actuator." in Proceedings from 2nd Annual ICHSF 2006. (3 2006).
  • E. Iriondo, B. Gonzalez, M. Gutierrez, V. Vonhout, G. Daehn, B. Hayes "Electromagnetic Springback Reshaping." in Proceedings from 2nd Annual ICHSF 2006. (1 2006).
  • Manish Kamal, Vincent Cheng, John Bradley, Steve Hatkevich, Glenn S. Daehn "Design, Construction, and Applications of the Uniform Pressure Electromagnetic Actuator." in Proceedings from 2nd Annual ICHSF 2006. (3 2006).
  • E. Iriondo, B. González, M. A. Gutiérrez, G. S. Daehn "New Approach for Springback Correction: Electromagnetic Impulses." in Proceedings from the International Conference New Developments in Sheet Metal Forming. (5 2006).
  • M. Kamal, V. Cheng, T.K. Sue, J. Shang and G.S. Daehn "Replication of Microfeatures by Electromagnetic Launch and Impact." in Proceeding from International Conference on Micromanufacturing. (9 2006).

2005

  • Edurne Iriondo, Beátriz Gonzalez, Iñaki Eguia, Marian Gutiérrez, Glenn Daehn "Experimental Study of Spingback Elimination Using Electromagnetic Forming." in Proceedings from the 2005 DDRG: Conference. (6 2005).

2004

  • V.J. Vohnout, J Shang, G.S. Daehn "Improved Formability by Control of Strain Distribution in Sheet Stamping Using Electromagnetic Impulses." in Proceedings from ICHSF. (3 2004).
  • I. Eguia, P. Zhang, G.S. Daehn "Improved Crimp-joining of Aluminum Tubes onto Mandrels with Undulating Surfaces." in Proceedings from ICHSF. (3 2004).

2002

  • A. Turner, P. Zhang, V.J. Vohnout and G.S. Daehn "Spot Impact Welding of Sheet Aluminum." in Materials Science Forum; Proceedings of the 8th International Conference ICAA8. (7 2002).
  • Li,D; Brantley,W,A; Mitchell,J,C; Daehn,G,S; Monaghan,P; Papazoglou,E "Fatigue studies of high-palladium dental casting alloys: Part 1. Fatigue limits and fracture characteristics." in 30th Annual Meeting of the American-Association-of-Dental-Research. (4 2002).

2001

  • N. Thirumalai, M.F. Savage, M. J. Mills and G. S. Daehn "Primary Creep in Polycrystalline Alpha-Titanium: Coupled Observations and a Stochastic Cellular Automaton Model." in Proceedings of the 9th International Conference on Creep and Fracture of Engineering Materials and Structures. (1 2001).

1999

  • V. J. Vohnout, G. S. Daehn and R. Shivpuri "A Hybrid Quasi-Static-Dynamic Process for Increased Limiting Strains in the Forming of Large Sheet Aluminum Parts." in Advanced Technology of Plasticity, Proceedings of the 6th ICTP Conf.. (1 1999).
  • Glenn S. Daehn, G. B. Viswanathan, Michael J. Mills and V. K. Vasudevan "A Model of Creep Based on Interacting Elements and its Application to the Primary Creep of Fully-Lamellar -TiAl." in Creep and Creep Resistant Materials for the 21st Century. (1 1999).
  • M.C. Carroll, M. J. Mills G. S. Daehn, P. I. Gouma, M. F. Savage and B. R. Dunbar "Effects of Minor Sc and Zr Additions on Commercial Al-Mg-Mn Alloys." in TMS Proceedings: Aluminum Alloys for Automotive Applications. (1 1999).

1998

  • L. Ceschini, M.C. Breslin, G.S. Dahen, G.L. Garagnani, G. Poli "Tribiological behaviour of Al-20%Si/Al2O3 high reinforcement content composites produced by a displacement reaction." in Proceedings of ECCM-8 (European Conference on Composite Materials), Napoli, 3-6 giugno. (1 1998).

1994

  • M. C. Breslin, J. Ringnalda, J. Seeger, A. L. Marasco, G. S. Daehn and H. L. Fraser "Alumina/Aluminum Co-Continuous Ceramic Composites Produced by Solid-Liquid Displacement Reactions: Processing Kinetics and Microstructures." in Ceramic Entineering and Science Proceedings. (1 1994).

1991

  • T. C. Lowe, P. Follansbee, T. Rollett, and G. S Daehn eds., "Modeling the Deformation of Crystalline Solids, Physical Theory, Application and Experimental Comparisons." in New Orleans. (1 1991).

Patents

  • John, R. Bradley, James G. Schroth and Glenn S. Daehn. "Electromagetic Formation of Fuel Cell Plates." Patent number: U.S. Patent 7,076.981
  • G. S. Daehn. "“Electromagnetic Metal Forming” (Uniform Pressure Actuator." Patent number: U. S. Patent, 2,069,756
  • G. S. Daehn, V. J. Vohnout and A. Tamhane. "Electromagnetic actuator, method of use and article made therefrom." Patent number: U. S. Patent 5,860,306
  • G. S. Daehn, V. J. Vohnout, L. DuBois. "Hybrid matched tool-electromagnetic forming apparatus incorporating electromagnetic actuator." Patent number: U.S. Patent 6,047,582
  • G. S. Daehn, V. J. Vohnout and L. DuBois. "Hybrid matched tool-electromagnetic forming apparatus." Patent number: U. S. Patent 6,050,120
  • G. S. Daehn and V. J. Vohnout. "Hybrid methods of forming using electromagnetic forming." Patent number: U.S. Patent 6,050,121
  • G. S. Daehn, V. J. Vohnout and E. A. Herman. "Hybrid matched tool forming methods." Patent number: U. S. Patent 6,085, 562
  • G. S. Daehn and Vincent J. Vohnout. "Hybrid Matched Tool-Hydraulic Forming Methods." Patent number: U.S. Patent 6,227, 023
  • G. S. Daehn. "High Velocity Forming of Local Features Using a Projectile." Patent number: U. S. Patent 7,000,300
  • Glenn S. Daehn. "Electromagnetic Actuator for Multiple Operations." Patent number: PCT Applicaton: PCT/US08/61066
  • Glenn D. Daehn and John C. Lippold.. "Low Temperature Spot Impact Welding Driven Without Contact." Patent number: PCT Application: PCT/US09/36499
  • John R. Bradley and Glenn S. Daehn. "Driver Plate for Electromagnetic Forming of Sheet Metal." Patent number: US Patent Application 2009/0090162
  • M. C. Carroll, M. J. Mills, R. G. Buchheit, G. S. Daehn, B. Morere, P. Kobe, and H. S. Goodrich. "5000 series alloys with improved corrosion properties and methods for their manufacture and use." Patent number: US Patent Application 10/628579