摘要
采用ER309焊丝对SAF2205双相不锈钢与16MnR低合金高强钢进行了钨极氩弧焊(TIG)焊接,对其接头进行了拉伸试验、冲击试验及硬度测试,并用扫描电镜、光学显微镜及X射线衍射仪对接头的显微组织进行了分析。结果表明:母材16MnR钢一侧与焊缝结合界面处分别存在一个脱碳层和增碳层,焊缝中心区为奥氏体+针状铁素体组织;拉伸试样断裂在强度相对较低的母材16MnR钢一侧;在16MnR钢/焊缝界面部位存在硬度突变;接头质量较高,其力学性能能够满足一般工程结构的要求。
The weld between SAF2205 duplex stainless steel and 16MnR low alloy high strength steel was jointed using tungsten inert gas are welding （TIG） with ER309 welding wire. The tensile test, impact test and hardness measurement were carried out for the joint. The microstructure of the joint was analyzed by using SEM, optical micnscopy and XRD. The results show that the decarburized layer and carbon-enriched layer were distributed on the side of the 16MnR base metal and in the side of the bonding interface with weld metal, respectively, and the microstructure of austenite and needle-like ferrite was formed in the center of the joint. The fracture of the tensile specimen occurred in the base metal 16MnR with a relatively low strength, and the microhardness of the joint was changed quickly at the interface of 16MnR steel/welal metal. The dissimilar metal welded joint had high quality and could meet the requirements of mechanical properties for engineering structures.
出处
《机械工程材料》
CAS
CSCD
北大核心
2010年第6期17-20,共4页
Materials For Mechanical Engineering
关键词
双相不锈钢
异种金属
焊接
显微组织
力学性能
duplex stainless steel
dissimilar metal
welding
microstructure
mechanical property
