铬钒共渗层出现黑洞的原因与控制

GCr15链条销轴经铬钒共渗热处理后,渗金属层出现黑洞,较多的黑洞对基体的连续性起到破坏作用,增大了脱落的风险。针对黑洞的情况,进行了一系列试验。结果表明,渗剂中钒的含量、催化剂的选用、设备的密封性等是形成黑洞的主要原因,通过修正渗剂的配比,采用真空设备来进行热处理,解决了渗金属层的黑洞的问题,大幅度提高了销轴的耐磨性。

Causes and control of black holes in chromvanadized layer

In order to avoid the risk of the damage of the continuity of matrix and the shedding of surface, a series of experiments were conducted to explore the cause of black holes appeared in the infiltrating metal layer of GCr15 chain pin by chromvanadizing heat treatment. The results show that the main reasons for the formation of black holes are the content of vanadium in the penetrating agent, the selection of catalysts and the airtightness of equipment. By modifying the proportion of permeating agent and using vacuum equipment to carry out heat treatment, the problem of black hole in permeating metal layer is solved, and the wear resistance of the pin shaft is greatly improved.