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热处理大刃具淬裂的机率较多,但如果采用的工艺得当或预防措施有力,是可以避免的。本文就以我厂生产的大丝锥为例,介绍如下。一、9SICr钢制M64×6和M80×6丝锥淬裂及预防我厂原来热处理大丝锥时,操作者参考本厂M4～M30丝锥的热处理工艺卡,按表1的工艺分级淬火,结果工件全部淬裂。经试验研究改进工艺和采取预防措施后,就保证了淬火质量和预防了淬火裂纹。其基本情况介绍如下。 1.裂纹发生情况原工艺路线为:整体淬火→检查硬度和显微组织→回火(180～200℃×2h)→检查硬度→局部回柄(盐浴炉820～830℃加热方尾后水冷)→检查方尾硬度和裂纹→磨削表面检查裂纹深度。检查结果:淬火硬度为HRC65;金相显微镜观察组织为稳晶马氏体,无脱碳现象;全部产品都有表面
Heat treatment of large blade quench cracked more chances, but if used properly or precautionary measures, can be avoided. This article on my factory production of tap, for example, described below. First, 9SICr steel M64 × 6 and M80 × 6 tap quench cracking and prevention I plant the original heat treatment tap, the operator reference to the factory M4 ~ M30 tap heat treatment process card, according to the classification of Table 1 quenching process, the results of all the work Quench crack. After the experimental study to improve the process and take precautions, to ensure the quality of quenching and prevent quenching cracks. The basic situation is described below. 1. The occurrence of cracks The original route is: the overall quenching → check the hardness and microstructure → tempering (180 ~ 200 ℃ × 2h) → check the hardness → local back handle (820 ~ 830 ℃ furnace salt water heater tail water cooling ) → Check the square tail hardness and cracks → grinding surface inspection crack depth. Test results: quenching hardness HRC65; metallographic microscope to observe the organization as a stable martensite, no decarburization phenomenon; all products have a surface