加热温度对22Si2MnCrNi2MoA钢渗碳层的影响  

Influence of Heating Temperature on Carburized Layers of22Si2MnCrNi2MoA Steel

作　　者：黄斌[1,2] 朱洪武[1] 杨忠[1,2] 周乐育[1] 刘雅政[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]西宁特殊钢股份有限公司,青海西宁810005

出　　处：《凿岩机械气动工具》2015年第3期36-42,共7页Rock Drilling Machinery & Pneumatic Tools

摘　　要：通过固体渗碳试验研究了加热温度对钎具用钢22Si2MnCrNi2MoA渗碳层的影响，分析了加热温度一碳浓度一显微硬度一残余奥氏体的关系以及残余奥氏体的控制措施。结果表明：当渗碳时间为6h时，随着加热温度的升高，渗碳层的碳浓度逐渐增加，碳浓度分布梯度越来越平缓。22Si2MnCrNi2MoA钢渗碳层的显微硬度一碳浓度关系符合正态分布。在渗碳处理过程中，为了使渗碳表层获得硬度很高的马氏体组织，22Si2Mn．CrNi2MoA钢渗碳层表面碳浓度应该控制在0．80％-0．90％之间。当表面碳浓度超过0．80％～0．90％时，渗碳完成后需采取后续的工艺措施来消除已经存在的残余奥氏体，如采用长时间自然时效或深冷处理等。Influence of heating temperature on carburized layers of 22Si2MnCrNi2MoA drill steel was studied by the solid carhurization experiment. The relationship between heating temperature, carbon intensity, micro-hardness and retained austenite and the measures to remove retained austenite were analyzed. The results indicate that with the heating temperature increasing as the earburizing time is fixed at 6 h, the carbon intensity of the carburized layers gradu- ally increased, and the distribution gradient of the carbon intensity of the carburized layers got smoother. The relation- ship between the micro-hardness of the earburized layers and carbon intensity obeyed the law of normal distribution. Fi- nally, it is established that, in the process of carburizing, the surface carbon intensity of the steel should be targeted be- tween 0.80% and 0.90% in order to make the surface of the carburized layers be the martensite of great hardness. Oth- erwise, when the surface carbon intensity is more than 0.80%~ 0.90%, the measures to remove the existing retained austenite after carburizing, such as the natural aging for a long time or deep cryogenic treatment, etc, were required.

关 键 词：钎具用钢 22Si2MnCrNi2MoA 渗碳 残余奥氏体 加热温度 

分 类 号：TG142.1[一般工业技术—材料科学与工程]