Zhili Feng
Materials Joining Group
Materials Science & Technology Division
Oak Ridge National Laboratory
P.O. Box 2008
Oak Ridge, TN 37831-6095
Phone: (865) 576-3797
Fax: (865) 574-4928
e-mail: fengz@ornl.gov

Research Interests:

Dr. Zhili Feng is a Senior R&D Staff Member of Materials Joining and NDE group of Metals and Ceramics Division, specializing in thermal-mechanical-metallurgical behaviors of materials during welding and joining. He is recognized for his research and development related to computational weld mechanics and materials, and computational simulations of welding processes and performances of welded structures. His research interests include:

  • Friction stir welding and processing;
  • Novel welding process development;
  • Effects of welding on weld microstructure and integrity of welded structures;
  • Thermal-mechanical-metallurgical modeling of welding processes and weld phase transformations;
  • Welding residual stress and distortion analysis and control;
  • Welding process simulation and optimization;
  • Modeling of weld solidification cracking, control of weld cracking by means of active thermal management, and modeling and design for advanced weldability test.
  • Application of neutron to study materials behavior during welding;
  • Effects of welding on irradiated materials;
  • Basic welding science and technology.

Dr. Feng has broad interactions with the industry in the area of materials joining, and extensive experience in application of analysis results to solve industry problems. Many of his R&D programs came from automotive, aerospace, petrochemical and power generation industries, as well as from government agencies such as DOE, DOD, NASA, NSF and NIST.

Education:

  • 1993 Ph.D., The Ohio State University, Columbus, OH
  • 1986 M.S., Tsinghua University, Beijing, CHINA
  • 1983 B. Eng., Tsinghua University, Beijing, CHINA

Professional Experience:

  • 2003 - Present:  Senior R&D Staff, Oak Ridge National Laboratory, Oak Ridge, TN.
  • 1999 - 2003:  Research Leader, Engineering Mechanics Corporation of Columbus, Columbus, OH.
  • 1995 - 1999:  Senior Research Engineer, Edison Welding Institute, Columbus, OH.
  • 1994 - 1995:  Postdoctoral Researcher, Oak Ridge National Laboratory, Oak Ridge, TN.

Awards:

  • 2001 Professor Koichi Masubuchi Award, American Welding Society
  • 1999 A. F. Davis Medal Award, American Welding Society
  • 1995 Arsham Amirikian Memorial Maritime Welding Award, American Welding Society
  • 1994 Henry Granjon Prize, International Institute of Welding.
  • 1991 W. H. Hobart Memorial Medal Award, American Welding Society

Major Professional Activities:

  • Principlal Reviewer, Welding Journal
  • Member, Board of Review in Metallurgical and Materials Transactions, B

Selected Publications:

  • Feng, Z. 2005, Processes and Mechanisms of Welding Residual Stress and Distortion, Woodhead Publishing Ltd, Cambridge, UK. 
  • Woo W, et al., 2005, "Deconvoluting the Influences of Heat and Plastic Deformation on Internal Strains Generated by Friction Stir Processing", Applied Physics Letters, 86, 231902.
  • Feng Z, et al., 2005, "Friction Stir Spot Welding of Advanced High-Strength Steels - a Feasibility Study", SAE 2005 Transactions Journal of Materials and Manufacturing 592-598.
  • Feng Z, et al., 2004, "Modeling of Residual Stresses and Property Distributions in Friction Stir Welds of Aluminum Alloy 6061-T6", 5th Int. Symp. on Friction Stir Welding, Metz, France.
  • Chauhan, V and Feng, Z, 2002, “Gas Transmission Pipeline Girth Weld Residual Stresses and the Effects of Hydrotesting,” Pro. 4th Intl Pipeline Conf 2002, Calgary, Canada, ASME Paper # IPC02-27140.
  • Feng, Z. et al. 2002, “Repair Welding of Irradiated Materials – Modeling of Helium Bubble Distributions for Determining Crack-Free Welding Procedures,” Proc. 10th Int. Conf. on Nuclear Engineering, ASME, Paper # ICONE10-22660.
  • Feng, Z., et al., 2001, “Modeling of Resistance Spot Welds – Process and Performance” Welding in the World, 45(11/12), 18-24.
  • Feng, Z., et al., 1999, “Development of Compressive Residual Stresses in Underwater PTA Welds,” 9th Int. Conf. On Environmental Degradation of Materials in Nuclear Power Systems Water Reactors, TMS, 757-764.
  • Feng. Z., et al., 1997. “Quantification of Thermomechanical Conditions in Weld Solidification Cracking,” Science and Technology of Welding and Joining, Vol 2, No 1, 11-19. 
  • Feng. Z. 1994.  “A Computational Analysis of Thermal and Mechanical Conditions for Weld Metal Solidification Cracking,” Welding in the World, 33(5): 340-347.

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