Cr18Ni3Mn11Cu3NbN钢焊接接头的组织和显微硬度  

Microstructure and Microhardness of Welded Joint of Cr18Ni3Mn11Cu3NbN Stainless Steel

作　　者：李丹[1] 陈希章[1] 刘瑜[2] 高佩[2] 王志健[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：《上海交通大学学报》2010年第S1期33-36,共4页Journal of Shanghai Jiaotong University

基　　金：镇江市科技支撑项目(GY2009004);江苏省普通高校研究生科研创新计划(CX09B_194Z)

摘　　要：采用脉冲钨极氩弧焊对Cr18Ni3Mn11Cu3NbN钢进行焊接试验,重点对其焊接接头的微观组织和硬度进行观察和分析,并利用PSR模型描述了Cr18Ni3Mn11Cu3NbN钢焊接接头3个区域的显微硬度随试验载荷变化的规律.结果表明:采用合适的工艺可以获得成形性能良好的焊缝,且焊缝中的熔敷金属为单相奥氏体;当载荷为9.81~980.00 mN时,焊缝和基体的硬度随载荷的降低而明显减小,当超过980.00 mN时,其硬度趋于稳定,当载荷为4.90 N时,沿垂直接头方向的焊缝区域硬度高于基体,热影响区的硬度介于基体和焊缝之间.The Cr18Ni3Mn11Cu3NbN steel was welded by pulsed tungsten argon arc welding,and the microstructure and microhardness of the welded joint were analyzed.The PSR model was adopted to describe accurately the variation of the microhardness in three weld regions with different testing load.The results show that good weld shape could be attained by suitable process,and the deposited metal is composed of single-phase austenite.The microhardness of each region of the welded joint decreases with the decrease of load under a load range of 9.81―980.00 mN,and it reaches a stable value as the load surpasses 980.00 mN.Along the vertical direction of the weld joint,the weld area hardness is higher than the matrix hardness,and the hardness of heat affected zone is between the matrix and the weld.

关 键 词：奥氏体不锈钢 氩弧焊 显微组织 显微硬度 

分 类 号：TG407[金属学及工艺—焊接]