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渗碳之后,为了细化晶粒,传统的处理工艺是二次淬火,第一细化芯部晶粒,第二次细化渗层晶粒。但由于这后一次淬火温度低,芯部基体未溶铁素体多,强度不高;而如果提高最后一次淬火温度,则渗层晶粒可能长大,降低了二次淬火的工艺效果。多年以来,我厂将渗碳后的冲头,采用循环加热办法使芯部和渗层晶粒超细化,最最后提高淬火温度,使芯部淬透成低碳马氏体,渗层细晶能经受最后淬火温度的考验,
After carburizing, in order to refine the grain, the traditional treatment process is secondary quenching, the first refinement of the core grain, the second refinement of the infiltration grain. However, due to the latter quenching temperature is low, the core matrix of undissolved ferrite, the strength is not high; and if the last quenching temperature increase, the diffusion layer grain may grow, reducing the secondary quenching process. Over the years, I plant the carburizing punch, the use of circulating heating method to make the core and layer grain refinement, the final increase in quenching temperature, the core quench into a low-carbon martensite, thin layer of fine Crystal can withstand the test of the final quenching temperature,