残留奥氏体对下贝氏体短时热处理工具钢性能的影响

Effect of Residual Austenite on Properties of Tool Steel following Shortened Treatments in Lower Bainitic Phase

近期研究表明,铬合金工具钢进行低成本的下贝氏体短时处理是可行的。但这些稍高于Ms温度的热处理保留了一定数量的残留奥氏体。为了更好地从金相学的角度弄清奥氏体转变为下贝氏体的机制,采用膨胀法进行了试验研究。以100Cr6(SAE 52100)钢为例,论述了经不同工艺热处理后的组织特征和性能变化。

Recent investigation show the possibility of shortened low-cost treatment of chromium alloyed tool steels in the lower bainitic state. But with these treatments just above the martensite start temperature remains still an amount of residual austenite. For better understanding of the reactions due to the transformation of austenite into lower bainite metallographic, studies completed by dilatometric tests have been carried out. Structural characteristics due to applied heat treatment processes are discussed and special changes of specific properties are discussed by example of the steel 100Cr6 （SAE 52100）.