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通过黑匣子装置测试退火炉中准150mm AISI4145H钢棒料退火的温度分布规律,研究在实验室模拟AISI4145H钢在650～740℃,在不同装炉位置试样的升温和冷却速度变化规律。还研究了退火工艺对其组织及硬度性能的影响。结果表明:AISI4145H钢在退火工艺为740℃保温1 h后空冷,试样组织为铁素体+粒状珠光体和少量细片状珠光体、硬度为21.2HRC,满足了工业切屑加工生产需要。该退火工艺采用坑冷的冷却方式,提高了退火冷却速度,退火冷却时间为10h,缩短了工件在炉时间,有效地提高了生产效率,降低了生产成本。
Through the black box device, the temperature distribution law of annealing of 150mm AISI4145H steel bar in the annealing furnace was studied. The variation of the heating and cooling rate of the AISI4145H steel was simulated in the laboratory at 650 ~ 740 ℃. The effect of annealing process on the microstructure and hardness properties was also studied. The results show that the AISI4145H steel is air-cooled after being annealed at 740 ℃ for 1 h and the microstructure of the sample is ferrite + granular pearlite and fine flake pearlite with hardness of 21.2HRC, which meets the need of industrial chip processing. The annealing process adopts the cooling method of pit cooling to improve the annealing cooling speed, the annealing cooling time is 10 hours, the working time of the workpiece is shortened, the production efficiency is effectively increased, and the production cost is reduced.