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一引言固体渗碳的最大缺点之一,是起因于另件和渗碳剂在渗碳箱中直接接触所引起的倾向于形成过饱和的渗碳表层。这种渗碳层在冷却时会变成脆性的网状碳化物,而大大地降低渗碳另件的强度。苏联学者柯兹洛夫斯基及奥尔叶莱毫夫斯基在研究渗碳钢的强度时,曾得出这样的结论:当渗碳层表面区的含碳量在1.05％以下(即在0.8％至1.05％时),钢的疲劳强度最为合适,若含碳量继续增高,则疲劳强度就会急剧下降。因此如何降低渗碳另件表面的含碳量,也就成为机械制造和热处理工作者所关心的问题了。
I. INTRODUCTION One of the biggest disadvantages of solid carburizing is the carburized skin that tends to form a supersaturated zone due to direct contact between the cementitious material and the carburizing agent in the carburizing tank. This carburized layer, upon cooling, becomes a brittle, networked carbide which greatly reduces the strength of the carburized part. When Soviet scholar Kozlovsky and Orlezeux Vwski studied the strength of carburized steel, he concluded that when the carbon content in the carburized surface area is below 1.05% 0.8% to 1.05%), the fatigue strength of steel is the most appropriate, if the carbon content continues to increase, then the fatigue strength will drop sharply. Therefore, how to reduce the carbon content on the surface of carburized parts has also become a concern of workers in mechanical manufacturing and heat treatment.