Carnegie Mellon University

Warren M. Garrison, Jr.

Warren M. Garrison, Jr.

Professor of Materials Science and Engineering

Department of Materials Science and Engineering
Carnegie Mellon University
5000 Forbes Avenue
Pittsburgh, PA 15213-3890


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 an Associate Editor for Materials and Metallurgical Transactions A.


Ph.D., University of California at Berkeley


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 (1) the effects of inclusion distributions and fine-scale microstructure on the toughness of ultra-high strength steels, (2) the effects of composition and heat treatment on the strength and toughness of martensitic precipitation strengthened stainless steels, (3) the effects of fine-scale microstucture and inclusion distributions on the strength and formability of advanced high strength steels for sheet applications and (4) the effects of microstructure and inclusion distributions on the stress corrosion cracking resistance of ultra-high strength steels. The effects of inclusion spacing, of inclusion volume fraction and of void nucleation resistance on toughness have been investigated for a wide range of fine-scale steel microstructures. It has been found that particles of titanium carbosulfide are much more resistant to void nucleation than particles of other sulfide types and that this improved resistance to void nucleation can lead to significant improvements in toughness, particularly in the steels HY180 and AF1410. The effects of cobalt on the strength of precipitation strengthened martensitic stainless steels has been investigated and has led to the development of new ultra-high strength stainless.


“A Discussion of the Effect of Inclusion Volume Fraction on the Toughness of Steel”, Warren M. Garrison Jr. and Andrzej Wojcieszynaki, Materials Science and Engineering A, 464, 321(2007)

“Controlling Inclusion Distributions to Achieve High Toughness in Steels”, W.M. Garrison Jr., AIST Transactions, 4, 132 (2007)

“A Comparison of the Effects of Cobalt, Silicon, Nickel and Aluminum on the Tempering Response of Medium Chromium Secondary Hardening Steel”, W. M. Garrison Jr., ISIJ International, 46, 782 (2006)

“The Effects of Titanium Additions on AF1410 Ultra-high Strength Steel”, L.E. Iorio and W.M. Garrison Jr., Metallurgical and Materials Transactions A, 37A, 1165 (2006)

“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)