应用TEM研究了H13钢580℃软氮化扩散层中同时生成的三种合金氮化物即CrN,VN和Mo_2N的形貌、位向关系及惯习面,发现它们由混合偏聚区经有序化连续转变而成,并且其形貌和晶体学特征与由不变线应变模型所预测的一致。
A TEM investigation was made of the morphology, orientation rela-tionship and habit plane of three kinds of alloy nitrides, namely CrN, VN andMo_2N, formed simultaneously in the diffusional nitrided layer of a 4Cr5MoV1Si(H13) steel nitrided at 580℃. It was found that the nitrides were precipitated bycontinuous clustering and subsequent ordering of both interstitial (N) and substitu-tional (Cr, V, Mo) solutes on {001} habit plane. The observed morphology andcrystallography of the nitrides are in good agreement with the predictions from theinvariant line strain model proposed for precipitation transformations.
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