研究了Ｆｅ－３０Ｎｉ合金冷轧板由马氏体到奥氏体（α－γ_ｒ）逆相变过程中的织构变化．原始材料的组织状态为形变马氏体、淬火马氏体及残余奥氏体．经过在不同温度加热后，利用Ｘ射线衍射精确测量了马氏体及奥氏体的取向密度分布函数（ＯｒｉｅｎｔａｔｉｏｎＤｉｓｔｒｉｂｕｔｉｏｎＦｕｎｃｔｉｏｎ简称ＯＤＦ）．结果表明，逆相变过程中奥氏体的织构变化可分为两个阶段：低温区，奥氏体织构逆变为原冷轧奥氏体织构，相变的进行可解释为具有强烈取向选择的剪切机制；高温区，相变的进行为定向长大机制，逆变奥氏体织构与冷轧奥氏体织构之间出现偏差，｛２１１｝〈１１１〉织构成分比原冷轧织构强度变弱．由ＯＤＦ差得到两温度区间的相变停止温度，此温度与取向有关，并可假设为相变机制变化温度．相变停止温度越高的取向，以定向长大机制进行的相变开始得越晚．
The original structure of Fe-30Ni alloy consisted of deformation-induced martensite, quenching martensite and retained austenite. After heating to different temperatures the ODF of austenite and martensite were determined. The result shows that at lower temperatures the texture of austenite reverts to the original texture of cold rolled austenite and the transformation is carried out by a shear-mechanism with strong variant selection. In the higher temperature range the transformation is carried out by an oriented-growth mechanism and the texture of retransformed austenite deviates from that of cold-rolled austenite. From the difference of ODF a " transformation-stop" temperature has been found, which is orientation-dependent and corresponding to the change of transformation mechanism. For the orientation with higher transformation-stop temperature, the transformation controlled by an oriented-growth mechanism will begin later.
参考文献
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| [6] | KesslerH,PitschW．ArchEisenhuettenwes,1968 |
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