Mo含量对大热输入下焊缝金属组织及冲击韧性的影响  

Effects of Mo Content on Microstructure and Impact Toughness of Weld Metal under High Heat Inputs

作　　者：宋峰雨 李艳梅[2] 王平 朱伏先[2] SONG Fengyu1, LI Yanmei2, WANG Ping3, ZHU Fuxian2(1. College of Mechanical and Electrical Engeneering, Longyan University, Longyan 364012, China; 2. State Key Laboratory of Rolling and Automation （RAL）, Northeastern University, Shenyang 110819, China; 3. Key Laboratory of Electromagnetic Processing of Materials（EPM）, Ministry of Education, Northeastern University, Shenyang 110819, China)

机构地区：[1]龙岩学院机电工程学院,福建龙岩364012 [2]东北大学轧制技术及连轧自动化国家重点实验室,辽宁沈阳110819 [3]东北大学材料电磁过程研究教育部重点实验室,辽宁沈阳110819

出　　处：《热加工工艺》2018年第5期25-28,共4页Hot Working Technology

基　　金：国家自然科学基金资助项目(51174058)

摘　　要：使用单道次垂直气电立焊和药芯焊丝在Q235钢板上制备了不同Mo含量的焊缝熔敷金属,研究了Mo含量对大热输入焊缝金属组织与冲击韧性的影响。结果表明：在大热输入焊接条件下,焊缝金属的奥氏体晶内形成了大量以微细夹杂物为核心的细密状针状铁素体,使焊缝金属具有较高的低温冲击韧性。随着Mo含量的增加,晶内针状铁素体晶粒尺寸减小,焊缝金属的低温冲击韧性增大,当Mo含量进一步提高至0.81%时,形成了大量粒状贝氏体组织,恶化了焊缝金属的低温冲击韧性。The weld metal with different Mo contents was prepared on Q235 steel sheet by using single pass vertical electro-gas welding and flux cored wires. The effects of Mo content on microstmcture and impact toughness of the weld metal under high heat inputs were studied. The results show that when welding with high heat input, a large number of acicular ferrite in austenite grains of the weld metal is formed with micro inclusions as core, and the weld metal has high low-temperature impact toughness. With the increase of Mo content, the grain size of intragranular acicular ferrite decreases, and the low-temperature impact toughness of the weld metal increases. When the Mo content increases to 0.81%, a large number of granular bainite structure is formed, and the low-temperature impact toughness of the weld metal is deteriorated.

关 键 词：大热输入 焊缝金属 针状铁素体 冲击韧性 

分 类 号：TG422.3[金属学及工艺—焊接]