摘要
采用AA-TIG焊打底埋弧焊填充盖面的方法,进行了12Cr2Mo1R耐热钢和304不锈钢两种大厚板的对接焊研究。通过对焊接接头微观组织及元素分布的观察及对接头硬度、拉伸性能、冲击韧性和弯曲性能的测试,分析了接头的组织和力学性能。结果表明,不锈钢热影响区为奥氏体基体和少量带状铁素体;耐热钢热影响区为贝氏体和马氏体;焊缝为奥氏体和铁素体。线扫描分析发现不锈钢侧熔合区Fe,Ni元素变化较大,而耐热钢侧Fe,Ni,Cr元素明显变化;显微硬度结果显示,焊缝硬度在220 HV左右,耐热钢热影响区出现明显的硬化现象;接头的抗拉强度最高达到678 MPa,-30℃条件下焊缝及不锈钢和耐热钢热影响区的冲击吸收能量为132 J,124 J,241 J。
The method of AA-TIG welding to weld bottom and the submerged arc welding to fill the cover surface was used to study the butt welding of two large and thick plates of 12Cr2Mo1R heat-resistant steel and 304 stainless steel.The microstructure and mechanical properties of welded joints were analyzed by methods of observing the microstructure and element distribution of welded joints and testing hardness,tensile properties,impact toughness and bending properties of welded joints.The results showed that the heat-affected zone of stainless steel was austenitic matrix with a small amount of band ferrite,the heat-affected zone of heat-resistant steel was bainite and martensite,while the weld was austenite and ferrite.It was founded by line scan analysis that the Fe and Ni element content in the fusion zone on the stainless steel side changed significantly,while the Fe,Ni,and Cr element content on the heat-resistant steel side change significantly.The microhardness test results showed that the hardness of the weld zone was about 220 HV,and there was obvious hardening in the heat-affected zone of heat-resistant steel.The tensile strength of welded joints was up to 678 MPa.The impact toughness of the weld and the heat-affected zone of stainless steel and heat-resistant steel at-30℃was 132 J,124 J,241 J.
作者
张建晓
刘光银
刘世恩
黄健康
樊丁
Zhang Jianxiao;Liu Guangyin;Liu Shien;Huang Jiankang;Fan Ding(State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Lanzhou LS Heavy Equipment Co.,Ltd.,Lanzhou 730314,China)
出处
《焊接》
2020年第10期7-13,61,62,共9页
Welding & Joining
基金
国家自然科学基金资助项目(51775256)。
