深冷处理对20CrMnTi钢渗碳齿轮硬度和残余奥氏体评定的影响

Steven

【文章名称】：深冷处理对20CrMnTi钢渗碳齿轮硬度和残余奥氏体评定的影响
【发表期刊】：<<理化检验-物理分册 >>2000年03期
【作者】：施友方
【摘要】：20CrMnTi钢渗碳齿轮最表层硬度偏低，系残余奥氏体量过多所致。通过深冷处理可使部分残余奥氏体转变成马氏体，从而提高了表面硬度。对金相法评定残余奥氏体的局限性进行了探讨。
Lower surface layer hardness in carburized 20CrMnTi gear was a result of excesssive amount of retained austeaite.A study was wade to increase its surface layer hardness by subzero treatment, during which re-tained austenite transformed into martensite. A discussion was made on limitation of metallographic evaluation of retained austenite.
【关键词】：硬度 有效硬化层深度 深冷处理 马氏体 残余奥氏体