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本文结合提高5CrMnMo矿用刮板机连接环热锻模使用寿命的攻关试验,对锻造淬火组织结构的遗传作用、高温淬火和复合等温淬火的综合强化工艺进行了研究。结果表明,经锻造余热淬火后,由于组织结构的遗传作用,使最终热处理后试件的亚结构细化,位错密度增大。在锻造余热淬火后的后续热处理工艺中,将淬火温度适当提高,并进行复合等温淬火,可使板条马氏体量增大,并获得较理想的马氏体与下贝氏体的复合组织。与原工艺相比,经同样温度回火后,试件的强度、硬度明显提高;而在硬度相同的条件下,其冲击韧性可提高1.5倍左右,回火稳定性显著提高。按综合强化工艺处理的连接环热锻模,使用寿命较原工艺提高4—6倍,工艺简单,经济效益显著。按目前蛟河煤机厂连接环的产量,经初步计算,每年可节约资金七万元左右。
In this paper, combined with improving the service life of hot forging dies of 5CrMnMo mining scraper, the genetic effects of forging quenching structure, the combination of high temperature quenching and compound isothermal quenching were studied. The results show that after forging residual heat quenching, the substructure of the final heat-treated specimen is refined and the dislocation density is increased due to the genetic effect of the structure. In the afterheat quenching forging heat treatment process, the quenching temperature is appropriately increased, and the composite isothermal quenching, the lath martensite can increase, and to obtain the ideal combination of martensite and lower bainite . Compared with the original technology, after the same temperature tempering, the strength and hardness of the test pieces obviously increased; while under the same hardness, the impact toughness can be increased by about 1.5 times, and the tempering stability is significantly improved. According to the comprehensive strengthening process of connecting ring hot forging die, the service life of 4-6 times higher than the original process, the process is simple, significant economic benefits. At present, Jiaohe coal machine factory production output ring, the initial calculation, the annual savings of about 70,000 yuan.