中文摘要：

在热模拟试验机上利用自行设计的试验装置进行热变形试验,研究了Cr15Mn9Cu2NiN及Cr17Mn6Ni4Cu2N两种奥氏体不锈钢铸坯在不同变形温度及变形量下裂纹的产生。结果表明,当变形量达到一定程度时,在研究的变形温度下,两种试验钢均会产生裂纹,裂纹均沿奥氏体晶界扩展。在这两种试验钢中均存在一个开裂倾向较高的温度区间,但该温度区间的大小及临界开裂应变量随温度的变化特点在两种钢中不同。该温度区间形成的主要原因是铸态组织及其变形特性引起的,而临界开裂变形量随温度表现出的不同特点则是由微观组织的差异导致的。

英文摘要：

The influence of deformation temperature and quantity on the occurrence of the cracks in austenitic stainless steels Crl 5Mn9Cu2NiN and Crl 7Mn6Ni4Cu2N was studied by hot deformation testg The results show that, when deformation quantity is in a certain amount, the specimens crack at research deformation temperatures, and the cracks propagate along the austenite grain boundary. There is a temperature range in which the cracking tendency of the specimen is severe. But the scale of the temperature range and critical cracking deformation quantity is different in the two steels. The analysis suggestes that the formation of temperature range is related to the as-cast microstructure and its deformation characteristics. The difference between the critical crack deformation amount is due to the different microstructure in the steels.