N50不锈钢铠甲焊丝研制与焊接接头性能研究  

Study on welding wire and performance of welded joint for N50 stainless steel jacket

作　　者：原园 刘锟 王松涛 牟淑坤 刘宏 邓素怀 王维俊 Yuan Yuan;Liu Kun;Wang Songtao;Mu Shukun;Liu Hong;Deng Suhuai;Wang Weijun(Shougang Research Institute of Technology,Beijing 100043,China;Beijing Key Laboratory of Green Recyclable Process for Iron&Steel Production Technology,Beijing 100043,China;Hefei Institutes of Physical Science,Chinese Academy of Sciences,Hefei 230031,China)

机构地区：[1]首钢集团有限公司技术研究院,北京100043 [2]绿色可循环钢铁流程北京市重点实验室,北京100043 [3]中国科学院合肥物质科学研究院,合肥230031

出　　处：《低温与超导》2024年第9期30-36,43,共8页Cryogenics and Superconductivity

基　　金：国家重点研发计划(2021YFB3702400);首钢科技项目(K202400310Y)资助。

摘　　要：针对核聚变CICC导体铠甲,通过设计成分以及采用真空冶炼、电渣、轧制和拉拔等工艺,研制出SGN50WG不锈钢焊丝。利用制备的SGN50WG焊丝采用氩弧焊焊接CICC铠甲用N50方圆管,并对焊接接头进行组织表征和力学性能检测。结果表明,所有焊接接头焊缝与母材结合良好,经过冷变形和导体热处理工艺后4.2 K下表现出优异的强韧性(角位置和面位置屈服强度分别为1442和1378 MPa,抗拉强度为1698和1684 MPa,延伸率为23.8和20.1%,断裂韧性高达195 MPa·m^(1/2)),有望用作CICC铠甲焊接材料。For the CICC conductor jacket,SGN50WG stainless steel welding wire was developed through designing the composition and using processes such as vacuum melting,electroslag,rolling and drawing.This welding wire was then employed to weld N50 circle-in-square tubes for CICC jacket by TIG welding.The microstructures and mechanical properties of the welded joints were thoroughly characterized and tested.The results demonstrate that all welded joints exhibit excellent bonding between the weld metal and the base metal.These joints exhibit excellent strength and toughness at 4.2 K after cold-deformation and conductor heat-treatment with yield strengths of 1442 MPa and 1378 MPa at the corner position and plane position respectively,ultimate tensile strengths of 1698 MPa and 1684 MPa,elongations of 23.8%and 20.1%,and fracture toughness as high as 195 MPa·m^(1/2),suggesting this welding wire has promising potential as a welding material for CICC jacket.

关 键 词：CICC铠甲 焊丝 氩弧焊 焊接接头 力学性能 

分 类 号：TG422.3[金属学及工艺—焊接]