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文中研究了GCr15电渣重熔钢的淬火方法、冷处理方法、回火温度及磨削过程中的附加回火工艺对工序间变形、尺寸稳定性和耐磨性的影响。热处理设备:淬火加热——C-25和H-45;冷处理—干冰—酒精溶液,冷冻机,液体氧;回火—油炉。残留奥氏体量用差示磁性法和X光法。尺寸精度用0.2u的光学扭簧表测量。耐磨性在ZYS-5型接触疲劳试验机上进行。通过一系列试验认为:1.淬火到深冷的停留时间、深冷方式(干冰—酒精、冷冻机、液态氧)、时间、次数对残留奥氏体量有影响,在不回火的情况下对残留奥氏体稳定性有相应的影响,但经过160℃ 3小时的回火后,上述因素对残留奥氏体的稳定性便没有什么影响了。5小 时与100小时β加回火的试样,其残留奥氏 体的稳定性差大。2.回火对残留奥氏体 的稳定性有很向,160℃3小时的回火 可使不深冷试样残留奥氏体的稳定性与经 过-78℃ 2小时深冷的相近似,200℃ 3 小时回火,可使之完全一样。但残留奥氏体 量并不一样。3.分级淬火能大大减少淬回火 和磨削过程中的变形;初磨套圈外圆后进行 一次附加回火(141一150℃ 5小时)能显著减少磨沟道过程中小圆椭圆度的变化。4. 150—160℃ 3分钟分级淬火,-78℃ 2小时深冷,160—170℃ 3小时回火,三次附加回火(140—150℃(5、5、10小时)处理的 B 236207 E?
In this paper, the effects of quenching method, cold treatment method, tempering temperature and additional tempering process on the deformation, dimensional stability and wear resistance of GCr15 ESR steel were studied. Heat Treatment Equipment: Quenching and Heating - C-25 and H-45; Cold Treatment - Dry Ice - Alcohol Solutions, Freezers, Liquid Oxygen; The amount of retained austenite by differential magnetic method and X-ray method. Dimensional accuracy with 0.2u optical torsion spring table measurement. Wear resistance ZYS-5 contact fatigue testing machine. Through a series of experiments that: 1. Quenching to cryogenic residence time, cryogenic way (dry ice - alcohol, freezers, liquid oxygen), time, the number of residual austenite have an impact, without tempering On the stability of the retained austenite have a corresponding impact, but after 160 ℃ 3 hours of tempering, the above factors on the stability of retained austenite had no effect. 5 hours and 100 hours β plus tempering of the sample, the retained austenite stability is poor. 2. Tempering the stability of the retained austenite has very direction, 160 ℃ 3 hours of tempering can make the stability of the retained austenite is not deep-frozen sample after 2 hours at -78 ℃ cryogenic phase similar, 200 ℃ 3 hours tempering, can make it exactly the same. However, the amount of retained austenite is not the same. 3. Classification quenching can greatly reduce the quenching and tempering during the deformation of the grinding process; initial ring after the outer circle of an additional tempering (141 a 150 ℃ 5 hours) can significantly reduce the process of milling round small ovality Variety. Quenching at 150-160 ° C for 3 minutes, cryogenic cooling at -78 ° C for 2 hours, tempering at 160-170 ° C for 3 hours, and tempering (140-150 ° C (5, 5, 10 hours) ?