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1.1 残余奥氏体的形成 奥氏体是面心立方相,在可淬火钢中,它在ACs和ACm相界以上的温度时是稳定的,但在这些温度以下则是不稳定的。从稳定的奥氏体区进行冷却时,它可能分解或转变为几种组成物之一,其类型取决于三个因素:(1)化学成份,就是淬火时固熔体中的合金元素和碳含量(若未溶解的碳化物或其它组成物跟奥氏体共存,这可能和基本成份不同),(2)
1.1. Retained austenite formation Austenite is a face-centered cubic phase that is stable in hardenable steels at temperatures above the ACs and ACm phase boundaries, but is unstable below these temperatures. When cooling from a stable austenite zone, it may decompose or transform into one of several compositions, the type of which depends on three factors: (1) The chemical composition, which is the alloying element in the solid solution during quenching and the carbon Content (if undissolved carbide or other composition coexists with austenite, which may differ from the basic composition), (2)