Solute Induced Embrittlement in Steel and Several Face-Centered Cubic Alloys

摘要

A hydrogenated f.c.c. alloy, 66Ni-30Cu-3Al, was subject under the conditions examined to brittle delayed failure. The static fatigue curve together with discontinuous crack propagation was an almost perfect image of that observed in high strength steel. Fracture behavior in alpha brass was studied under conditions where strain-aging type phenomena are operative. Alpha brass, under the proper conditions, exhibited both spontaneous strain-aging embrittlement and embrittlement produced by separately straining and aging. The alpha brass also exhibited delayed failure which has all the main characteristics of interstitial induced brittle delayed failure. The phenomenon of delayed failure has been correlated with microstructure in two alloy steels at three moderate strength levels. Delayed failure may occur over a relatively significant range of applied stress at these strength levels. The sensitivity to delayed failure may persist even though conventional tensile results indicate full ductility. The observed reductions in ductility are a function of microstructure at given strength level. (Author)