δ铁素体形成机制以及对马氏体耐热钢冲击功的影响  

Forming Mechanism of δ-Ferrite and Its Effect on Martensite Heat-Resistant Steel Impact Energy

作　　者：赵义瀚[1,2] 赵成志[1] 王健楠[1] 蒋辰宇 袁玉平[1] 

机构地区：[1]哈尔滨工程大学材料科学与化学工程学院,黑龙江哈尔滨150001 [2]哈尔滨汽轮机厂有限责任公司,黑龙江哈尔滨150046

出　　处：《钢铁》2013年第4期70-75,共6页Iron and Steel

摘　　要：通过Thermo-Calc热力学软件计算、定量金相分析、冲击试验和SEM试验分析,研究了化学成分和正火温度对材料中δ铁素体含量的影响,并分析了δ铁素体的形成机制,以及含量和位置分布对材料冲击韧性的影响。结果表明:化学成分和正火温度对δ铁素体含量影响显著,C+N含量增加能够显著降低材料中的δ铁素体含量;δ铁素体主要集中在原奥氏体晶界位置生成,显著降低材料的冲击功,并且在δ铁素体与马氏体基体界面位置会聚集大量富Nb碳化物,降低韧性的同时减少了MX相生成量。The effect of chemical compositions and heat treatment normalizing temperature on δ-ferrite content was investigated to analyze the forming mechanism of δ-ferrite through thermo-calc thermodynamic equilibrium phase calculations and quantitative metallographic analysis,mechanical property test,SEM analysis.The effect of content and position distribution of δ-ferrite on impact energy was also analyzed.The results show that chemical compositions and normalizing temperature have obvious effect on δ-ferrite content.δ-ferrite content will decrease with increase in C and N content.The δ-ferrite mainly concentrates in the prior austenite grain boundary,which can decrease impact energy.There are the large aggregations of rich Nb cabide,which can decrease MX phase content.

关 键 词：正火温度 Δ铁素体 冲击功 马氏体耐热钢 

分 类 号：TG142.15[一般工业技术—材料科学与工程]