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利用JMatPro软件模拟了液压支柱缸体用27SiMn钢凝固和冷却过程的组织与性能。计算时,考虑不同相的组织性能差异,得到室温至熔化温度区间合金中主要相的热物理性能参数和部分力学性能参数,以及27SiMn钢冷却过程的CCT曲线。结果表明:27SiMn钢奥氏体转变温度区间为716~838℃;在900~1453℃,存在MNS相;在1414~1468℃,奥氏体含量开始减小,高温铁素体相增大。当温度低于731.64℃时,有渗碳体析出;当温度低于380℃时,有M7C3形成,室温平衡组织为铁素体+渗碳体+M3P+M7C3。
The structure and properties of 27SiMn steel for solidification and cooling of hydraulic prop cylinder were simulated by JMatPro software. In the calculation, the thermophysical properties and the partial mechanical properties of the main phases in the alloy at room temperature to the melting temperature were obtained, and the CCT curves of the cooling process of 27SiMn steel were taken into account. The results show that the austenite transformation temperature of 27SiMn steel ranges from 716 to 838 ℃. At 900 to 1453 ℃, the MNS phase exists. At 1414 to 1468 ℃, the austenite content begins to decrease and the high temperature ferrite phase increases. When the temperature is lower than 731.64 ℃, cementite is precipitated. When the temperature is lower than 380 ℃, M7C3 is formed. The equilibrium structure at room temperature is ferrite + cementite + M3P + M7C3.