800H合金焊接性能研究  

Study on Welding Properties of Alloy 800H

作　　者：程晓农[1] 邱宇[1] 李冬升[1] 戴起勋[1] 高仕渊[1] 姜杨[1] 王植栋[1] 高佩[2] 王国建[2] 

机构地区：[1]江苏大学材料科学与工程学院,江苏镇江212013 [2]江苏银环精密钢管股份有限公司,江苏宜兴214203

出　　处：《热加工工艺》2013年第7期154-156,160,共4页Hot Working Technology

基　　金："十二五"国家863重大项目(2012AA03A501);江苏大学高级专业人才基金资助项目(12JDG066);省级重点实验室开放课题(kjsmcx1004)

摘　　要：采用TIG焊接了800H合金。利用OM和SEM对焊接接头的微观组织进行表征，通过EDS分析了第二相的成分，用XRD对焊缝和母材进行物相分析。使用万能试验机和硬度试验机测试了焊接接头的力学性能，并观察了拉伸断口的形貌。结果表明：采用焊接电流65～70A、焊接速度100～120ram／rain、氩气流量8～10L／min的工艺条件，有效避免了焊接热裂纹的出现，焊缝组织为奥氏体和少量第二相（主要为Fe、Cr的碳化物和TiN）；焊接接头的平均抗拉强度高达520MPa、伸长率为32％，拉伸断裂为韧性断裂；焊缝和热影响区的硬度较低，平均值分别为154．2和161．7HV，母材硬度平均为184HV。Alloy 800H was welded by TIG. The microstructure of the welded joint was characterized by optical microscopy （OM） and scanning electron microscopy （SEM）. The chemical composition of the second-phase was analyzed by energy diffraction spectrum （EDS）. The phase of weld metal and base metal was scanned by X-ray diffraction （XRD）. The mechanical properties of the welded joint were tested by universal testing machine and hardness tester （HV）, and the morphology of the tensile fracture was observed. The results show that the heat cracks can be avoided by this process （welding current is 65-70 A, welding speed is 100-120 mm/min, flow rate of argon gas is 8-10 L/min）. The microstructure of the welding metal is austenite and a small amount of second-phase （TiN and carbide of Fe and Cr）. The average tensile strength and elongation of the welded joint is 520 MPa and 32%, respectively, and the failure is ductile. The average hardness of the weld metal and heat-affected zone is 154.2 HV and 161.7 HV, respectively. The average hardness of the base metal is 184 HV.

关 键 词：800H合金 焊接 力学性能 显微组织 核电 

分 类 号：TG444[金属学及工艺—焊接] TG142.73[一般工业技术—材料科学与工程]