12Cr-4Ni-3Mo-V-Nb-N叶片钢高频淬火后回火硬化现象  

Secondary Hardening of 12Cr-4Ni-3Mo-V-Nb-N Steel after High Frequency Quenching and Tempering

作　　者：高振桓[1] 巩秀芳[1] 徐永锋[1] 杨明[1] 张邦强[1] 范华[1] 

机构地区：[1]东方汽轮机有限公司,四川德阳618000

出　　处：《东方汽轮机》2015年第1期65-67,共3页Dongfang Turbine

摘　　要：12Cr-4Ni-3Mo-V-Nb-N叶片钢在高频淬火后进行不同温度的回火,发现随回火制度不同,硬度在250℃/4 h回火后下降,但在250℃/4 h+500℃/4 h及500℃/4 h回火后明显升高,文章对不同温度下回火的组织进行了TEM观察,结果显示在500℃回火过程中弥散析出的MX相和M23C6是导致硬度升高的关键原因。12Cr-4Ni-3Mo-V-Nb-N steel was tempered after high frequency quenching at different temperature, it found that with different tempering, the hardness at 250 ℃ / 4 h declined after tempering, but at 250 ℃ / 4 h ＋ 500 ℃ / 4 h and 500 ℃ / 4 h significantly increased after tempering. TEM observation showed that the dispersed precipitated phase including M23C6 and MX in the process of tempering at 500 ℃ was the key reason for the high hardness.

关 键 词：叶片钢 高频淬火 回火硬化 

分 类 号：TG151[金属学及工艺—热处理]