TWIP钢TIG焊接接头的组织与性能  

Microstructure and mechanical properties of TIG welding joint of TWIP steel

作　　者：胡志强[1] 李春福[1] 宋开红[1] 陈庆勇[1] 阳义[1] 杨凯朝[1] 

机构地区：[1]西南石油大学油气藏地质及开发国家重点实验室,四川成都610500

出　　处：《金属热处理》2012年第3期46-50,共5页Heat Treatment of Metals

摘　　要：研究了TWIP(21Mn24Cr5Ni2Al2Si)钢冷轧板手工TIG焊接后的焊接接头组织和力学性能。结果表明,焊接接头和母材组织均为单一奥氏体,且不形成孪晶,拉伸后的组织有少量形变孪晶。母材的抗拉强度和显微硬度远高于焊接接头,母材伸长率略低于焊接接头;母材断口为准解理断裂,无缩颈;焊接接头为韧窝型韧性断裂,有明显缩颈。母材和焊接接头的性能有巨大差异,且TWIP效应不明显,有必要对其整体进行固溶处理。Microstructure and mechanical properties of 21Mn24Cr5Ni2Al2Si-TWIP cold rolling plate after manual TIG welding was studied.The results shows that the microstructure of base metal and welded joint both are single austenite,and without twin structure.There is a little deformation twins after tensile test.The tensile strength and hardness of base metal is much higher than welded joint,but the elongation is slightly lower than welded joint;Fracture morphology shows that fracture of base metal is quasi-cleavage fracture without necking down.Fracture of welding joint is dimple-type ductile fracture with clearly necking down.The performance matching of base metal and welding joint has huge difference,and TWIP effect is not obvious.Therefore,solution treatment for the welding metal is very necessary.

关 键 词：TWIP钢 TIG焊 焊缝区 显微组织 力学性能 

分 类 号：TG142.2[一般工业技术—材料科学与工程]