摘要
采用焊条电弧焊(SMAW)、埋弧焊(SAW)和等离子弧焊+钨极氩弧焊组合焊(PAW+TIG)三种方法对国产06Cr19Ni10奥氏体不锈钢进行焊接,室温下经8%的应变强化后,对焊接接头进行单向静拉伸和低温冲击试验。结果表明:应变强化后,原板材和三种焊接接头的屈服强度和抗拉强度增加,屈服强度的增幅尤为显著,伸长率减小;焊缝区冲击吸收功和侧向膨胀量升高,热影响区的冲击吸收功和侧向膨胀量下降。SMAW焊缝应变强化后的伸长率和冲击吸收功低于行业标准,焊缝不合格;PAW+TIG焊接接头力学性能最优异。应变强化前后,原板材显微组织均为单一的奥氏体相;三种焊缝及热影响区为奥氏体和铁素体的两相组织,SMAW焊缝中的铁素体分布最密集,SAW焊缝中的铁素体最粗大,PAW+TIG焊缝中的铁素体分布最杂乱。
Shielded metal arc welding(SMAW),submerged arc welding(SAW)and the combination welding of plasma arc welding and tungsten-argon arc welding(PAW+TIG)were used to weld domestic 06Cr19Ni10 austenitic stainless steel.After strain strengthening treatment with the strain of 8%,the uniaxial static tensile test and low temperature impact test of the welded joints were conducted.The results indicat that after strain strengthening the yield strength and the tensile strength of the plates and welded joints increase,the increase of yield strength is especially significant,and the elongation decreases.The impact absorption energy and lateral expansion of the welding zones increase,while the impact absorption energy and lateral expansion of the heat affected zones(HAZs)descend.After strain strengthening the elongation and impact absorption energy of the weld produced by SMAW are lower than the industry standards,so the weld is not qualified.The mechanical properties of the PAW+TIG welded joint are the best.Before and after strain strengthening,the microstructures of the plate are single austenite and the microstructures of the weld zones and the heat affected zones produced by the three weld methods are austenitic matrix and ferrite dual-phase structures.The highest density of ferrite is found in the SMAW welded joints.The coarsest ferrite is found in the SAW welded joints.The most disordered ferrite is found in PAW+TIG welded joints.
作者
王丽芳
满达虎
张德勤
游胜意
WANG Lifang;MAN Dahu;ZHANG Deqin;YOU Shengyi(School of Mechanical and Materials Engineering,Jiujiang University,Jiujiang 332005,China;Ao Sheng(Jiujiang)Advanced Materials Co.,Ltd.,Jiujiang 332000,China)
出处
《热加工工艺》
北大核心
2019年第23期48-51,57,共5页
Hot Working Technology
基金
江西省高等学校教学改革项目(JXJG-17-17-4)
九江学院校级科研项目(2013KJ11)
关键词
焊接方法
奥氏体不锈钢
焊接接头
应变强化
welding method
austenitic stainless steel
welded joint
strain strengthening
