SEDL / STP / STP672-EB / STP36879S

Effect of Heat Treatment and Microstructure on the Mechanical and Corrosion Properties of a Precipitation Hardenable Stainless Steel

Kosa, T
Metallurgist, Stainless Alloy Metallurgy, and supervisor, Corrosion and Welding Research, Carpenter Technology Corporation, Research and Development Center, Reading, Pa.

DeBold, TA
Metallurgist, Stainless Alloy Metallurgy, and supervisor, Corrosion and Welding Research, Carpenter Technology Corporation, Research and Development Center, Reading, Pa.

Pages: 15    Published: Jan 1979

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Abstract

Custom 450 is a martensitic precipitation hardenable stainless steel. The strengthening mechanism during aging is attributed to precipitation of a very fine Laves phase. The precipitate was found to be relatively stable with respect to coarsening at aging temperatures above 811 K (1000°F). The aging reaction is accompanied by austenite reversion. The decrease in hardness and strength and increase in impact strength with increasing aging temperature and time when aging above 811 K are shown to be related to the increasing reverted austenite content of the alloy. Data are presented showing the effect of heat treatment on resistance to stress corrosion cracking. The relationship of cracking to toughness and general corrosion resistance is discussed.