9Ni钢焊条电弧焊接头组织与性能  

Analysis on microstructure and properties of welded joint for 9Ni steel with SMAW welding

作　　者：尹燕[1] 李雪[1] 朱旻 罗晓军 张瑞华 

机构地区：[1]兰州理工大学省部共建有色金属先进加工与再利用国家重点实验室,甘肃兰州730050 [2]中石油第二建设公司,甘肃兰州730060 [3]中国钢研科技集团有限公司,北京100081

出　　处：《电焊机》2015年第12期138-141,共4页Electric Welding Machine

基　　金：国家自然科学基金资助(51265031)

摘　　要：为了保证产品的焊接质量,为现场焊接提供理论依据与指导,采用焊条电弧焊对12 mm厚的9Ni钢板进行多层多道焊焊接,使用光学显微镜、维氏显微硬度计、万能试验机对焊接接头的微观组织及力学性能进行分析。结果表明:焊接接头熔合良好,没有出现裂纹、气孔等缺陷。热影响区的组织为板条马氏体组织,焊缝的组织为树枝晶状奥氏体组织。焊接接头的硬度随着与焊缝距离的增加,呈先增大后减小的趋势,试样的抗拉强度平均值为715 MPa;进行弯曲试验,试验后没有出现表面裂纹和其他表面缺陷。In order to guarantee the welding quality of the product and provide theory basis and guidance for field welding, SMAW is selected in this experiment for 12 mm thickness of 9 Ni steel multipass welding.In this paper,the microstructures and the mechanical properties of welded joints are analyzed by optical microscope, HV type micro-hardness meter and universal machine.The results show that there arc good welded joints without any gas pores and cracks.The microstructures of HAZ and welds respectively are lath martensite and branch crystal austenite.As the distance from weld increases,the hardness of welded joint increases first and then decreases, the average value of the tensile strength of specimens are 715 MPa, and no cracks or defects appears on the surfaces during bending experiment.

关 键 词：9NI钢 焊条电弧焊 显微组织 力学性能 

分 类 号：TG457.11[金属学及工艺—焊接]