CMU > Materials Science and Engineering

Professor Warren M. Garrison, Jr.
Professor of Materials Science and Engineering
Ph.D., University of California at Berkeley

3303 Wean Hall
Carnegie Mellon University
Pittsburgh, PA 15213-3890

E-mail:
Phone: (412) 268-3593
FAX: (412) 268-7596

Research Interests

Professor Garrison's primary research interests are in the influence of microstructure on the mechanical behavior of metallic materials with an emphasis on steels. Currently the primary interests are the effects inclusion distributions and fine-scale microstructure on the fracture toughness of ultra-high strength steels and the effect of composition on the strength and toughness of martensitic precipitation strengthened stainless steels. The effects of inclusion spacing and the effect of void nucleation resistance at inclusions has been investigated for a wide range of fine-scale steel microstructures, and it has been found that particles of titanium carbosulfide are much more resistant to void initiation than particles of other sulfide types and this improved resistance to void nucleation can lead to very high toughness in HY180 and AF1410 steels. The effects of cobalt on the strength of precipitation strengthened martensitic stainless steels is currently being investigated and these results are being applied to the development of new martensitic stainless steels.

Biography

Professor Garrison graduated Phi Beta Kappa in Physics from the University of California at Berkeley. He received his M.A. in Physics from the University of California at Davis. He received his Ph.D in Materials Science from the University of California at Berkeley in 1979. From 1979 until 1984 he was in the Materials Science Department at the Sandia National Laboratory, Livermore, California. He joined Carnegie Mellon University in 1984 and became a full professor in 1990. He has been most interested in the effects of microstructure on the mechanical behavior of steels and this work has led to two alloys currently in production. The first is a new jet engine shaft alloy developed with General Electric Aircraft Engines and the second is a low alloy steel developed for mining applications. He holds four patents. He is a fellow of the ASM and is presently an Associate Editor for Materials and Metallurgical Transactions A.

Recent Publications

"The Effect of Sulfide Type on the Fracture Behavior of HY180 Steel", J. L. Maloney and W.M. Garrison Jr., Acta Materialia, 53, 533 (2005)

"The Effects of Inclusion Type on the Toughness of Ultra-high Strength Structural Steels", W. M. Garrison Jr., Proceedings of the 7th Workshop on the Ultra-Steel, Tsukuba, Japan June 24-25, 2003, page 11.

"Nanotechnology and the Development of New Ultra-high Strength Stainless Steels for Landing Gear Applications", W. M. Garrison Jr., Proceedings of the 7th Workshop on the Ultra-Steel, Tsukuba, Japan June 24-25, 2003, page 92.

"Solubility of Titanium Carbosulfide in Austenite",Luana E. Iorio and Warren M. Garrison, Jr., ISIJ International, 42 545 (2002)

"Effects of Gettering Sulfur as CrS or MnS on Void Generation Behavior in Ultra-High Strength Steel", L. E. Iorio and W.M. Garrison, Jr., Scripta Materialia, 46, 863 (2002)