铬含量对热作模具钢热处理工艺及热稳定性的影响  

Effect of Cr content on heat treatment process and thermal-stability of hot work steel

作　　者：朱姣[1,2] 马党参[2] 周健[2] 陈再枝[2] 项金钟[1] 迟宏宵[2] 

机构地区：[1]云南大学物理科学技术学院,云南昆明650091 [2]钢铁研究总院结构材料研究所,北京100081

出　　处：《材料热处理学报》2013年第10期121-126,共6页Transactions of Materials and Heat Treatment

摘　　要：利用OM,SEM和TEM及ThermoCalc(TCFE 3数据库)热力学计算等方法,结合热稳定性试验数据,研究了两种不同铬含量的热作模具钢4Cr3SiWMoVNb钢和4Cr5SiWMoVNb钢的热稳定性能。结果表明:4Cr3SiWMoVNb钢和4Cr5SiWMoVNb钢的最佳淬火温度分别为1000℃和1030℃;回火温度高于600℃后,4Cr3SiWMoVNb钢表现出更好的回火抗性;随回火时间的延长,两钢的硬度均呈下降趋势,4Cr5SiWMoVNb钢中有较多的以含Cr为主的M23C6碳化物粗化长大,组织较快发生回复与再结晶,硬度下降较快,而4Cr3SiWMoVNb钢热稳定性相对优异。Thermal-stability of 4Cr3SiWMoVNb steel and 4CrSSiWMoVNb steel with different content of Cr was investigated by means of OM, SEM, TEM and calculation using ThermoCalc software and TCFE3 database. The results show that the optimum quenching temperature of 4Cr3SiWMoVNb steel and 4Cr5SiWMoVNb steel is 1000 ℃ and 1030 ℃. When the tempering temperature is higher than 600 ℃ , 4Cr3SiWMoVNb steel shows better tempering resistance. The hardness of 4Cr3SiWMoVNb steel and 4CrSSiWMoVNb steel both decreases during long time aging at the tempering temperature. But there is more Cr23 C6 carbides in the 4CrSSiWMoVNb steel, which tend to grow and coarsen during tempering, and the recrystallization of the steel occurs more quickly. That is the reason that the hardness of 4CrSSiWMoVNb steel decreases more quickly than that of 4CrSSiWMoVNb steel during tempering. And the 4Cr3SiWMoVNb steel has better thermal-stability.

关 键 词：热作模具钢 热处理 热稳定性 碳化物 组织演变 

分 类 号：TG162.8[金属学及工艺—热处理]