SA508-3钢平衡相转变的热力学计算和分析  

Thermodynamic Calculation and Analysis on Equilibrium Phases Transformation in SA508-3 Steel

作　　者：陈红宇[1] 刘正东[2] 林肇杰[2] 周芸[1] 

机构地区：[1]昆明理工大学材料与冶金工程学院,昆明650093 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《特殊钢》2007年第2期19-21,共3页Special Steel

摘　　要：采用Thermo-Calc热力学软件计算了SA508-3钢(％:0．19C、0．01-0．22Si、1．40-1．58Mn、0．65- 0．76Ni、0．50-0．55Mo)的析出相、析出温度和各相的含量,并研究了Si和Mn-Ni-Mo含量对该钢析出相的影响。计算结果表明,SA508-3钢平衡态的析出相主要为合金渗碳体、M7C3及Mo的碳化物。Si含量变化对钢中各相析出温度和析出量无显著影响。随Mo含量降低,钢中脆性相析出减少,但对合金渗碳体析出无显著影响。SA508-3钢最佳回火温度为643-678℃。Precipitated phases, precipitated temperature and each phase content in SA508-3 steel - 0. 19C, 0.01 - 0. 22Si, 1.40 - 1.58Mn, 0. 65 -0. 76Ni, 0. 50 -0.55Mo have been calculated by using Thermo-Calc thermodynamic software, and effect of Si and Mn-Ni-Mo content on precipitated phases in the steel was studied. The calculated results show that main equilibrium precipitates in SA508-3 steel are alloying cementite, MTC3 and Mo carbide. There is no obvious effect of Si content change on precipitated temperature and precipitated amount of each phase. With increasing Mo content the brittle precipitated phases decreased while there is not obvious effect on alloying cementite precipitates. The optimum tempering temperature for SA508-3 steel is 643- 678 ℃.

关 键 词：SA508.3钢 析出相 热力学计算 

分 类 号：TG115[金属学及工艺—物理冶金]