Evaluation of Microstructure and Mechanical Properties in Dissimilar Austenitic/Super Duplex Stainless Steel Joint

被引:0
作者
Mehdi Rahmani
Abbas Eghlimi
Morteza Shamanian
机构
[1] Islamic Azad University,Department of Materials Engineering, Najafabad Branch
[2] Isfahan University of Technology,Department of Materials Engineering
来源
Journal of Materials Engineering and Performance | 2014年 / 23卷
关键词
austenitic stainless steel; dissimilar welding; mechanical properties; microstructure; super duplex stainless steel;
D O I
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中图分类号
学科分类号
摘要
To study the effect of chemical composition on microstructural features and mechanical properties of dissimilar joints between super duplex and austenitic stainless steels, welding was attempted by gas tungsten arc welding process with a super duplex (ER2594) and an austenitic (ER309LMo) stainless steel filler metal. While the austenitic weld metal had vermicular delta ferrite within austenitic matrix, super duplex stainless steel was mainly comprised of allotriomorphic grain boundary and Widmanstätten side plate austenite morphologies in the ferrite matrix. Also the heat-affected zone of austenitic base metal comprised of large austenite grains with little amounts of ferrite, whereas a coarse-grained ferritic region was observed in the heat-affected zone of super duplex base metal. Although both welded joints showed acceptable mechanical properties, the hardness and impact strength of the weld metal produced using super duplex filler metal were found to be better than that obtained by austenitic filler metal.
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页码:3745 / 3753
页数:8
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