摘要
通过对形变奥氏体组织进行长期时效观察合金相演化过程 ,研究了低放射性亚稳奥氏体Fe Cr Mn(W ,V)合金的组织稳定性。实验表明 :合金在高于 40 0℃时 ,相平衡处在γ +α +σ三相区 ,低于 40 0℃可以保证亚稳奥氏体的稳定性。亚稳奥氏体可以发生γ→ε→α′→α转变也可以发生γ→γ(f)→α′(f)→α转变 ,ε马氏体不是γ→α转变的唯一中间过渡相。形变诱发ε马氏体形成过程中伴随奥氏体晶粒碎化 ,可产生细晶强化作用 ,这是开发亚稳奥氏体Fe Cr Mn合金的重要途径。
Phase Stability in a low radioactivity sub\|stable austenite after long time ageing.The results show that the alloy is in a (γ+α+σ) three phases triangle when aged higher than 400℃. The phase stability of the sub\|stable austenite has maintained when below 400℃ ageing.\;The transformation of γ→ε→α′→α may occur and there is also transformation of γ→γ(f)→α′(f)→α in the sub\|stable austenite.ε Martensite is not only transition phase of γ→α transformation.Formation of deformation induced ε martensite is accompanied with grain refinement of austenite, which may lead to grain refinement strength.This is a important way of development of sub\|stable austenitic Fe\|Cr\|Mn(W,V) alloy.
基金
国家自然科学基金!资助项目 ( 5 9781 0 0 3)
