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第四讲形变诱发马氏体相变今天我们将要讨论形变对马氏体相变的影响。我们知道,马氏体相变是位移式的,因此对弹性应力和范性应变是敏感的。许多年前,我们曾利用范性形变的影响来测定T_(?),即母相奥氏体与产物相马氏体自由能相等的温度。由图4—1可以看出,在含27至35％(原子)Ni的铁镍合金中,Ms温度随镍含量的增加而降低。当一个给定合金(例如含30％镍)冷却到低于Ms温
Lecture 4 Deformation-induced martensitic transformation Today we will discuss the effect of deformation on martensitic transformation. We know that martensitic transformation is a displacement type and therefore sensitive to elastic stress and normal strain. Many years ago, we used the effect of the normal deformation to determine the T_ (?), That is, the temperature at which the parent austenite equals the free energy of the product martensite. It can be seen from Fig. 4-1 that in the iron-nickel alloy containing 27 to 35% (atomic) Ni, the Ms temperature decreases with increasing nickel content. When a given alloy (for example containing 30% nickel) cools below Ms temperature