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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。
The microstructure evolution of low-metastable austenite Fe Cr Mn (W, V) alloy was studied by observing the phase evolution of deformed austenite by long-term aging. Experiments show that when the alloy is above 40 0 ℃, the phase equilibrium is in the γ + α + σ three phase region, and the stability of metastable austenite can be ensured when the temperature is below 40 0 ℃. Metastable austenite can occur γ → ε → α ’→ α transformation γ → γ (f) → α’ (f) → α transformation, ε martensite is not the only intermediate transition phase γ → α transition. Deformation induced ε martensite with the formation of austenite grain size reduction can produce fine grain strengthening, which is an important way to develop metastable austenite Fe Cr Mn alloy.