摘要
通过向碳素钢中添加微量钙元素,在钢中形成弥散的热稳定的第二相含钙的氧化物粒子。利用扫描电镜、光学电镜、系列冲击试验和显微硬度测试等检测方法,对微钙钢焊接粗晶热影响区(CGHAZ)组织、奥氏体晶粒度及强韧度进行了研究。结果表明,弥散分布的含钙的氧化物粒子,钉扎了焊接热循环过程中CGHAZ的奥氏体晶界迁移,限制了奥氏体晶粒的长大,获得较细的焊接CGHAZ晶粒度,进而改善了微钙钢焊接CGHAZ的强韧度。
The thermal-stable particles of oxide containing Ca can be formed in micro-calcium steel which can be obtained by appending Si-Ca powder into carbon steel.The microstructure,γ grain size,strength and toughness of coarse grain heat affected zone(CGHAZ)in micro-calcium and no micro-calcium steels were studied by SEM,microscope,tensile test and series impact experimental.The research show that the second phase particles have strong pinning force to γ grain boundary of CGHAZ in micro-calcium steel.It can retard γ grain growth in the course of welding,and fine γ grain in the CGHAZ,and improve the strength and toughness of CGHAZ in micro-calcium steel.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2007年第3期73-76,共4页
Transactions of The China Welding Institution
关键词
微钙钢
奥氏体晶界
晶粒
韧度
micro-calcium
γ grain boundary
γ grain size
toughness
