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研究了不同冷却速度下的35SiMnMo中空钢的显微组织和硬度的变化,并将计算机模拟结果与试验结果进行了对比分析。结果表明,随着冷却速度的增加,35SiMnMo中空钢中的特殊上贝氏体组织的体积分数有不断减少的趋势,而块状复合结构的体积分数有不断增加的趋势;计算机模拟得到的不同冷却速度下的特殊上贝氏体相和块状复合相的体积分数与热模拟试验得到的结果具有较好的一致性;线性拟合得到的35SiMnMo中空钢的硬度与冷却速度关系式H=24.76+14.2 V,关系式的方差为0.97,表明计算机模拟得到的硬度与热模拟试验得到的硬度值基本一致。
The microstructure and hardness of 35SiMnMo hollow steel under different cooling rates were studied. The results of computer simulation and experimental results were compared. The results show that with the increase of cooling rate, the volume fraction of special upper bainite in 35SiMnMo hollow steel tends to decrease, while the volume fraction of massive composite structure tends to increase. The different cooling The volume fraction of special upper bainite phase and bulk composite phase has good consistency with the results obtained by thermal simulation. The relationship between hardness and cooling rate of 35SiMnMo hollow steel obtained by linear fitting is H = 24.76 + 14.2 V, the variance of the correlation is 0.97, which shows that the hardness obtained by computer simulation is basically the same as that obtained by thermal simulation.