机械工程材料
MATERSALS FOR MECHANICAL ENGINEERING DOI;10.11973/jxgecl201509016
2015年9月第39券第9期Vel.39No.9Sep.2015
Incoloy825合金TIG和PAW焊接接头
耐晶间腐蚀性能的对比徐学利"，王纯"，毕宗岳"，杨耀斌"，张万鹏”，王冬（1.西安石油大学材料科学与工程学院，西安710065；
2.国家石油天热气管材工程技术研究中心，宝鸡721008；3.宝鸡住金石油钢管有限公司，宝鸡721008）
摘要：采用ASTMA262-E标准方法对Incoloy825合金钨极氢弧焊(TIG)接头和等离子弧焊(PAW)接头进行晶间扁蚀试验，通过腐蚀速率、背弯曲性能以及扁蚀形貌对两种焊接接头的耐晶间腐蚀性能进行了对比。结果表明：PAW接接头的平均腐蚀速率为0.1566g*m-2.h-1,TIG
接头紧邻熔合线的热影响区中晶粒较粗大，晶界上有细小的碳化物析出；PAW焊接接头紧邻熔合线附近区城的热影响区中晶粒长大不明显；PAW焊接接头的晶粒尺寸比TIG接头的粗大。
关键词：Incoloy825合金；晶间腐蚀；焊接接头；钨极氢弧焊；等离子弧焊
中图分类号：TG174.3
文献标志码：A
文章编号：1000-3738(2015)09-0068-04
ComparisonofIntergranularCorrosionResistanceofTIG
and PAW Welded Joints of Incoloy825Alloy
XU Xue-li',WANG Chun',BI Zong-yuel-,YANG Yao-bin’,ZHANG Wan-peng’,WANG Dong
(1.School of Materials Science and Engineering, Xi'an Shiyou University, Xi'an 710065, China;
2.Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods, Beoji 721008, China
3.Baoji-SMI Petroleum Steel Pipe Corporation,Baoji 721008,China)
Abstract: Intergranular corrosion test was carried on TIG and PAW welded joints of Incoloy825 alloy according to ASTM A262-E, and the intergranular corrosion resistance of the two kinds of welded joints was compared by corrosion rate, back bending property and corrosion morphology. The results show that the average corrosion rate of PAW and TIG welded joints were 0. 156 6 g*m h1 and 0.229 3 g*m1 .h1, respectively. No cracks were found on the tensile surface of the two kinds of welded joint after back bending. For the TIG welded joint, the grains located in the heat affected zone near to the fusion line were coarse, and fine carbides precipitated on grain boundaries, For the PAW welded joint, the grains located in the heat affected zone near to the fusion line had not obvious growth, and the grains size in PAW welded joint was larger than that in TIG welded joint.
Key words: Incoloy825 alloy; intergranular corrosion; welded joint; tungesten argon are weiding(TIG), plasma arc welding(PAW)
0引言
与一般碳钢、不锈钢及其它耐蚀合金相比，镍基收稿日期：2014-09-27；修订日期：2015-07-10
基金项目：国家高技术研究发展计划资助项目（2013AA031303)；队
西省优势学科专项资金资助项目(ys37020203）
作简介：徐学利（1963一)，男，陕西泾阳人，教授。
通讯作者：王纯 68
万方数据
合金在各种腐蚀环境中都表现出了优良的耐腐蚀性能"]，而且具有强度高以及塑、韧性好等优异的性能，广泛应用于石油、化工、航空航天等领域(2-3。镍基合金中具有代表性的为Incoloy825合金，它是由Inconel公司开发的一种添加了钼、铜和钛的镍-铁-铬固溶强化合金。由于含有镍、铬和钼等元素，该合金具有良好的抗氟化物应力腐蚀、抗氧化以及抗点蚀的能力，同时还具有抗中性和还原性酸和碱