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.
出处
《钢铁》
CAS
CSCD
北大核心
2013年第4期70-75,共6页
Iron and Steel
关键词
正火温度
Δ铁素体
冲击功
马氏体耐热钢
normalizing temperature
δ-ferrite
impact energy
martensite heat-resistant steel
