摘要
采用钨极氩弧焊方法,实现了22MnB5超高强钢淬火前后同种材料之间的连接,进行了焊接接头拉伸试验和热影响区内显微组织及硬度分布试验,并对焊接前后材料的抗腐蚀性能进行了试验分析.结果表明,淬火处理后22MnB5组织结构从铁素体+珠光体组织转变为马氏体组织,显微硬度与抗拉强度大幅度提高,原始及淬火后材料的焊接接头具有良好的力学性能和组织形貌,焊后焊接接头抗拉强度和硬度略低于原始母材,经淬火处理后的材料焊后抗拉强度达到1 179.59 MPa,略低于淬火材料但比原始母材高很多,淬火热处理材料的腐蚀速率略有上升,而焊接后将大幅度增加腐蚀速率,通过比较淬火焊缝钢腐蚀速率最大.
The ultra high strength steel 22MnB5 before and after quenching were joined by tungsten inert gas(TIG) arc welding,the mechanical properties and microstructure of welded joints were studied by experiments,and the corrosion property of welded joints was analysis and compare with the base metal as well.The result shows that the ferrite and pearlite of nonquenched material were transformed to martensite after quenching treatment.The welded joints of the base metal have good mechanical property and microstructures,the tensile strength and hardness of the joints are slightly lower than the one of the base metal,the tensile strength of welded joints of quenched material reach 1 179.59 MPa,that is slightly lower than that of quenched material,but much higher than that of non-quenched base metal.The corrosion rates were rising after quenching heat treatment,the corrosion rate of the welding zone is much higher than the base metal,and the welding zone corrosion rate of the quenching material is highest.
出处
《焊接学报》
EI
CAS
CSCD
北大核心
2014年第2期67-69,78,共4页
Transactions of The China Welding Institution
基金
哈尔滨工业大学创新基金资助项目(HIT.NSRIF.201012)
关键词
22MnB5超高强钢
淬火
组织性能
腐蚀性能
22MnB5 ultra high strength steel
quenching
microstructure
corrosion property
