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采取光学显微镜、扫描电镜和热模拟试验机,对10Ni3Mn Cu Al钢进行固溶和时效工艺研究。结果表明:固溶后随着冷却速度的提高,试验钢硬度增加,当冷却速度大于1℃/s时,钢硬度变化不大;随着时效温度的提高,硬度呈抛物线变化,在500℃达到硬度峰值;随着时效时间的延长,硬度逐渐提高,45 min到60 min在380 HV5左右出现一个平台,当时效时间延长到90 min,硬度均值为401 HV5。10Ni3Mn Cu Al钢经900℃固溶保温3 min/mm,随后以大于1℃/s冷却到室温,500℃时效保温90 min,硬度可达38~42 HRC(373~412 HV5),满足客户对钢板的硬度要求。
The microstructure and aging process of 10Ni3Mn CuAl steel were studied by optical microscope, scanning electron microscopy and thermal simulation testing machine. The results show that the hardness of the test steel increases with the increase of the cooling rate after solution treatment. When the cooling rate is more than 1 ℃ / s, the hardness of the steel does not change much. With the increase of aging temperature, the hardness changes parabolically at 500 ℃ With the aging time increasing, the hardness gradually increased, a platform appeared at 380 HV5 from 45 min to 60 min, the aging time was extended to 90 min and the average hardness was 401 HV5.10Ni3Mn Cu Al steel solution at 900 ℃ The temperature was maintained for 3 min / mm, then cooled to room temperature with a temperature greater than 1 ° C / s, aged at 500 ° C for 90 min, and hardened to 38-42 HRC (373-412 HV5) to meet customers’ hardness requirements.