【摘要】 利用自制的焊接工作台 ,在TIG焊基础上 ,对新型Cr30Mo2超纯铁素体不锈钢施焊。焊接过程中对焊缝和热影响区附加拖罩和背衬的Ar气延续保护。对焊接接头质量进行宏观和X射线探伤检验 ;借助金相显微镜、扫描电镜 (SEM)、透射电镜 (TEM)分析焊缝组织特征和冲击断口形貌 ;按国家标准测试焊接接头的力学性能。研究结果表明 ,在焊接接头上未发现任何焊接缺陷 ,焊缝质量良好 ;其强度、延性和韧性均达到母材水平 ,特别是在焊缝和热影响区未出现脆化现象 ,冲击韧性值较高。冲击断口形貌特征为韧窝断口形貌。更多还原

【Abstract】 A welding bench was designed.By using it a new type of high purity ferritic stainless steel was welded based on TIG.The welded joints of Cr30Mo2 ferritic stainless steel were formed by the argon arc welding with stretching argon shielding behind nozzle.The qualities of welded joints were carried on by visual examination and X radiographic inspection.Microstructure of welded joint was investigated by means of metalloscope.Impact fracture morphologies were analyzed by making use of scanning electron microscope(SEM) and transmission electron microscope(TEM).The joint mechanical properties were measured according to national standard.The results showed that any weld defects were not found in welded joint.Mechanical properties of welded joint were in good agreement with the base metal,especially,the plastic and impact toughness properties on the weld metal and heat affected zone(HAZ) were not decreased.Toughness fracture micromorphology characters were found in heat affected zone of welded joint.更多还原