焊接热输入量和保护气体成分对S32205双相不锈钢低温冲击韧性的影响  

Effect of Welding Heat Input and Shielding Gas Composition on Low Temperature Impact Toughness of S32205 Duplex Stainless Steel

作　　者：徐阿敏 吉海 许全光 吕越 沈强 XU A'min;JI Hai;XU Quanguang;LYU Yue;SHEN Qiang(Zhejiang Jiuli Special Material Science and Technology Co.,Ltd.,Huzhou 313028,Zhejiang,China;Huzhou University,Huzhou 313000,Zhejiang,China)

机构地区：[1]浙江久立特材科技股份有限公司,浙江湖州313028 [2]湖州师范学院,浙江湖州313000

出　　处：《焊管》2024年第4期25-31,共7页Welded Pipe and Tube

基　　金：湖州市公益性应用研究项目“S32750超级双相不锈钢管低温韧性的影响因素研究及加工工艺优化”(项目编号2021GZ03)。

摘　　要：采用等离子弧焊(PAW)+钨极惰性气体保护焊(GTAW)对2205双相不锈钢进行焊接,研究了在GTAW焊接过程中,热输入量和保护气体这两个要素对材料焊接部位低温冲击韧性的影响,并通过金相和SEM等对微观组织结构进行分析研究。结果表明,采用GTAW焊接时,热输入量会影响晶粒组织中铁素体/奥氏体相比例和奥氏体形态,当热输入量为1.76 kJ/cm时,焊接部位的低温冲击性能(-46℃)最佳;在保护气体中添加N_(2),会影响奥氏体和铁素体比例以及氮化物(CrN/Cr_(2)N)析出相在铁素体中的析出数量,并且导致微气孔形成,当N_(2)添加量为1%左右时,焊接部位的低温冲击性能最佳。The plasma arc welding(PAW)+gas tungsten arc welding(GTAW)technology is used to weld 2205 duplex stainless steel.During GTAW welding process,the effects of heat input and shielding gas on the low⁃temperature impact toughness of the material welding site are studied,and through metallographic and SEM analysis the microstructure are analyzed.The results show that the heat input can affect the morphology and the proportion of austenitic and ferrite grains during GTAW welding.When the heat input is 1.76 kJ/cm,the low temperature(-46℃)impact performance of the welding part is the best.The addition of N2 in the protective gas will affect the proportion of austenite and ferrite and the precipitation amount of CrN/Cr_(2)N in the ferrite.It may lead to the formation of microvoids.When the addition amount of N_(2) is 1%,the low temperature(-46℃)impact performance of the welding site is the best.

关 键 词：2205双相不锈钢 钨极惰性气体保护焊 低温冲击韧性 金相分析 

分 类 号：TG142.71[一般工业技术—材料科学与工程]