考虑相差异的煤矿液压支柱缸体用27SiMn钢组织性能预测

Microstructure and Properties Prediction for Colliery Hydraulic Prop Cylinder Used 27SiMn Steel Considering Phase Difference

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 microstructure and properties of hydraulic prop cylinder used 27SiMn steel in process of solidification and cooling was simulated. In calculation, considering the difference of different phase＇s microstructure and properties, the thermal physical performance parameters and some mechanical properties for the main phase from room temperature to the melting temperature, as well as the CCT curve were obtained. The results show that：the transition temperature range for austenite is 716-838 ℃ ; MNS phase exists at 900-1453℃ , At 1414-1468 ℃ , the austenite content begins to decrease and high-temperature ferrite phase increases. In addition, when the temperature is lower than 731.64 ℃, the cementite precipitates; and M7C3 appears when the temperature is below 380 ℃, the final room temperature equilibrium microstructure is ferrite, cementite, M3P and M7C3.