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《Materials for Mechanical Engineering》 2015-09
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Comparison of Intergranular Corrosion Resistance of TIG and PAW Welded Joints of Incoloy825 Alloy

XU Xue-li;WANG Chun;BI Zong-yue;YANG Yao-bin;ZHANG Wan-peng;WANG Dong;School of Materials Science and Engineering,Xi′an Shiyou University;Chinese National Engineering Research Center for Petroleum and Natural Gas Tubular Goods;Baoji-SMI Petroleum Steel Pipe Corporation;  
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 6g·m-2·h-1 and 0.229 3g·m-2·h-1,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.
【Fund】: 国家高技术研究发展计划资助项目(2013AA031303);; 陕西省优势学科专项资金资助项目(ys37020203)
【CateGory Index】: TG444.74;TG456.2
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