反应堆压力容器用低合金钢平衡相热力学计算与分析  

Thermodynamic calculation and analysis on equilibrium phase in low alloy steel for reactor pressure vessel

作　　者：何西扣[1] 李昌义[1] 刘正东[1] 林肇杰[1] 

机构地区：[1]钢铁研究总院特殊钢研究所,北京100081

出　　处：《金属热处理》2013年第5期14-17,共4页Heat Treatment of Metals

基　　金：国家科技重大专项基金项目(2010ZX06004-016)

摘　　要：利用Thermo-calc热力学计算软件对反应堆压力容器用508-3和508-4N低合金钢的热力学平衡相进行计算和比较。结果表明:在ASME规定的回火温度范围内,508-3钢中的平衡相主要为两种M3C型碳化物(渗碳体和ξ-碳化物),508-4N钢中的平衡相为M23C6型碳化物。根据平衡相在α-铁和γ-铁中的析出驱动力讨论了两种钢中平衡相的析出行为。利用TEM观察实际508-3钢和508-4N钢调质态样品的微观组织,衍射斑标定析出相分别为M3C和M23C6,与热力学计算结果相符合。Thermodynamic equilibrium phase in 508-3 steel and 508-4N steel were calculated and compared by using Thermo-calc thermodynamic software. The results show that thermodynamic equilibrium phases are mainly M3 C carbides including eementite and C-carbide in 508-3 steel, while is M23 C6 carbide in 508-4N steel for the tempering temperature region required by ASME code. The precipitation behavior of M3C and M23C6 carbides was discussed by precipitation driving force of the equilibrium phases in α-Fe and γ-Fe. Microstrueture of 508-3 and 508-4N steels was observed by TEM, and found that the precipitation is M3 C and M23 C6 respectively, which are accorded with the thermodynamic calculation results.

关 键 词：反应堆压力容器 508—3钢 508-4N钢 热力学平衡相 

分 类 号：TG142.41[一般工业技术—材料科学与工程]