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某厂生产的18CrNiMo7-6齿轮轴,在进行热处理过程中出现开裂,将齿轮轴切开,采用金相、扫描电镜等分析方法对试样断口的裂纹源以及裂纹的扩展、裂纹末端进行了综合分析,查找开裂原因。结果表明裂纹两侧没有氧化脱碳,没有非金属夹杂物聚集,裂纹是淬火裂纹,没有发现导致淬火裂纹的冶金缺陷,裂纹是齿轮轴淬火后没及时回火造成的。

Gear shaft of 18CrNiMo7-6 steel in some plants happen to crack in the heat-treatment process; the gear shaft was cut, aiming to find out the cracks on 18CrNiMo7-6 steel by testing the gear shaft, the crack source on the fracture surface, its propagation and its end using macroscopic inspection, microscopic inspection as well as elec- tronic microscope scanning. There were no oxidation, decarburization and gathering of nonmetallic inclusions along the crack and its two sides; no metallurgical defects that cause cracking were found and the results showed that cracks were quenching cracks, which were mainly caused by tempering non-timely after quenching

参考文献

[1] 王广生.金属热处理分析及案例[M].北京:机械工业出版社,2007
[2] 崔忠圻;谭耀春.金属学与热处理[M].北京:机械工业出版社,2007
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