Verification of a Microstructurally-Based Equation for Elevated-Temperature Transient Isotropic Hardening

摘要

A recent investigation quantified, by a root-mean-square equation, the separate effects of forest dislocations and subgrain boundaries on elevated (750 exp 0 C) temperature strength of type 304 stainless steel. This was accomplished by producing structures in which the subgrain size and forest dislocation density were not related by the usual one-to-one correspondence. Such structures were produced by combinations of warm and cold working. In the present investigation the equation is evaluated against data on transient structures produced exclusively at elevated temperatures (750 to 1065 exp 0 C). It is shown that the equation reliably predicts, over this elevated temperature range, the strength of structures in which the prominent microstructural features are subgrains and forest dislocations. (ERA citation 07:054416)