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我厂承接加工的滚轮(如图),用45钢制成,要求外圆耐磨,并要有一定韧性,淬火后要求硬度HRC 50～55。但经常规工艺淬火后,小孔部位严重开裂,造成成批报废。试用各种冷却介质,效果甚微。后改为亚温淬火工艺,解决了小孔的开裂问题。我们作了不同温度加热于5％食盐水中冷却,看开裂和硬度情况的试验,结果见表1。根据试验结果可以看出:在两相区加热淬火,可以达到零件所要求的硬度,并且无裂纹产生,为此确定淬火温度为755℃,保温15分钟。亚温淬火的回火
I plant to undertake the processing of the wheel (pictured), made of 45 steel, requiring external wear-resistant, and have a certain toughness, hardness after quenching HRC 50 ~ 55. However, after conventional quenching process, a serious crack hole parts, resulting in bulk scrapped. Try a variety of cooling media, with little effect. After changing to sub-temperature quenching process to solve the problem of cracking holes. We made different temperature heating in 5% salt water cooling to see the cracking and hardness of the test results in Table 1. According to the test results, it can be seen that in the two-phase zone, heating and quenching can achieve the required hardness of the part and there is no crack, so a quenching temperature of 755 ° C. and a holding time of 15 minutes are determined. Sub-tempered tempered tempering