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某45钢锥套锻件在调质热处理后的粗加工时发现轮缘面有沿圆周向裂纹。通过金相、化学成分、硬度测试、扫描电镜、补充热处理等分析试验,对45钢锥套裂纹原因进行了分析。结果表明,该45钢锥套裂纹性质为淬火裂纹,淬火裂纹产生原因有二:一是淬火介质为盐水,淬火冷速过快,淬火冷却应力过大;二是锥套轮缘面厚度处于45钢临界淬火尺寸范围内。并提出了热处理工艺参数预防措施,至今未再发生类似事故,锥套锻件废品率降为零。
A 45 steel cone forging in the quenching and tempering after roughing found along the circumferential surface of the rims have cracks. Through the analysis of metallographic, chemical composition, hardness test, scanning electron microscopy, supplemental heat treatment and other analytical tests, the causes of crack in 45 steel taper sleeve were analyzed. The results show that the crack nature of the 45 steel taper sleeve is quenching crack, and there are two reasons for the quench cracking. One is that the quenching medium is salt water, quenching speed is too fast and quenching cooling stress is too large; second, Steel critical quenching size range. And put forward the heat treatment process parameters preventive measures, so far no similar accident, cone forgings scrap rate dropped to zero.