ASTM 4130钢的局部脆化研究  

Study on Local Brittleness of ASTM 4130 Steel

作　　者：李宏伟 李立英[2] 韩涛[2] 杨浩[2] 

机构地区：[1]上海外高桥造船有限公司,上海200137 [2]中国石油大学(华东)机电工程学院,山东东营257061

出　　处：《压力容器》2010年第6期16-20,共5页Pressure Vessel Technology

基　　金：国家高技术研究发展计划(863计划)资助项目(2006AA09A103-6)

摘　　要：利用焊接热模拟试验以及金相和透射电镜技术研究了中碳调质钢ASTM 4130钢的组织转变与冲击性能的关系。结果表明,一次热循环的粗晶区和二次热循环的临界粗晶区是调质态ASTM 4130钢焊接热影响区的2个局部脆化区,相对母材韧性损失分别达94.5%和96.6%。粗晶区脆化的主要原因是大量上贝氏体和未回火马氏体的生成以及晶粒粗大;沿晶分布的"项链"状M-A组元和块状铁素体的存在是临界粗晶区脆化的主要组织因素。The relationship between microstrcture and impact toughness in medium carbon queched and tempered steel ASTM 4130 was investigated using welding thermal simulation experiment, matallography and transmission electron microscope （TEM）. The results show that Coarse -Grained Heat affected zone （CGHAZ） and the Intercritically Reheated Coarse- Grained Heat affected zone （IRCGHAZ）, with the toughness loss by 94.5% and 96.6% respectively compared to the base metal, become the two brittle zones. The embrittleness of CGHAZ is due to the formation of a large amount of non - tempered martens- ite and upper bainite and grain coarsing. And the reason for the embrittleness of IRCGHAZ is the pres- ence of a large amount of M - A constituent and massive ferrite.

关 键 词：ASTM 4130 热影响区 冲击性能 局部脆化 

分 类 号：TG40[金属学及工艺—焊接]