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去年九月份,我们处理过一批T8板件(170×130×26mm),板上镗有大小不一的孔,技术要求为HRC43～48。开始,我们按照常规的淬火工艺:加热到790～810℃,水(三硝水)→油双液淬火。在水中停留时间为6～8s,即在水中停留时间系数为0.2～0.3s/mm。淬火后孔与孔之间出现严重开裂现象。我们观察金相组织,除晶粒度稍大外,组织正常。用线切割割下26×10×10mm长方形试样,测得表面硬度为HRC62,心
In September last year, we handled a batch of T8 plates (170 × 130 × 26mm) with holes of different sizes. The technical requirements are HRC43 ~ 48. The beginning, we follow the conventional quenching process: heating to 790 ~ 810 ℃, water (triple-nitrous) → oil double-liquid quenching. The residence time in water is 6 ~ 8s, that is, the residence time coefficient in water is 0.2 ~ 0.3s / mm. Quenching hole and hole between the serious cracking phenomenon. We observe the microstructure, in addition to larger grain size, the normal organization. A 26 × 10 × 10 mm rectangular specimen was cut with a wire saw and the surface hardness was measured as HRC62, heart