正火12Cr1MoV钢回火脆化的冷速敏感性  

COOLING RATE SENSITIVITY OF TEMPER EMBRITTLEMENT OF NORMALIZED 12Cr1MoV STEEL

作　　者：孙树文[1,2] 雷廷权[1,2] 唐之秀 犹公[1,2] 王欣 陈家伦[1,2] 

机构地区：[1]哈尔滨工业大学 [2]哈尔滨锅炉有限责任公司

出　　处：《钢铁》1998年第8期38-41,共4页Iron and Steel

摘　　要：采用示波冲击试验和高分辨透射电子显微分析技术，研究了回火冷却方式对正火１２Ｃｒ１ＭｏＶ钢回火脆化的影响。结果表明，该钢存在两个不同的回火冷速敏感性温度区间：高于６４０℃回火，铁素体基体中沉淀析出碳化物以ＶＣ类型为主，回火脆性没有明显的冷速敏感性；低于６４０℃回火，基体中沉淀析出的碳化物以Ｆｅ３Ｃ类型为主，回火脆化具有明显的冷速敏感性和可逆性。Effect of cooling rate after tempering on the temper embrittlement of normalized 12Cr1MoV steel was studied by means of instrumented Charpy impact tests and HRTEM observations The results show that there are two tempering temperature ranges with different cooling rate sensitivity For the embrittlement occurred at higher temper temperatures(>640 ℃),there's no sensitivity to the cooling rate after tempering The embrittlement is irreversible and is caused mainly by VC precipitates For the embrittlement occurred at lower temper temperatures(<640 ℃),there's a great sensitivity to the cooling rate after tempering The embrittlement is reversible and is caused by Fe 3C precipitates

关 键 词：回火脆性 沉淀硬化 冲击韧性 合金钢 冷速敏感性 

分 类 号：TG142.33[一般工业技术—材料科学与工程] TG111.91[金属学及工艺—金属材料]