二辊楔横轧轧件的微观组织

 为了研究楔横轧条件下工件的性能，在考虑原始棒料直径、变形温度、断面收缩率以及工件轧后热处理状态等的基础上，利用二辊楔横轧机进行了系列楔横轧轧制实验。对轧后工件进行指定位置线切割取样，并用金相分析法得到变形后工件的高温奥氏体晶粒尺寸分布及低温相组成。实验结果表明：降低轧制温度有利于得到较细小的高温奥氏体晶粒，是一种提高工件综合性能的新工艺。对于直径较细的工件，轧后立即淬火几乎可得到全部马氏体。

Microstructure of Workpiece for Two-Roll Cross Wedge Rolling

In order to research product properties of the cross wedge rolling(CWR),a series of rolling experiments have been carried out on two-roller CWR under the condition of considering the variation of the original diameter,deformation temperature,area reduction and heat treatment methods and so on.The hot austenite grain distribution and the phase composition at normal temperature were obtained with the aid of metallographic analysis method after the rolled workpieces were divided at the specified position on the linear cutting machine.The experimental results show that decreasing rolling temperature is helpful in getting the fine austenite grain size in comparison with the conventional rolling deformation temperature,which is a kind of potential technique for improving the general properties of the workpieces.As for small diameter workpiece,martensite distribution can be obtained by immediately quenching.