| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Welding Wires on Microstructures and Mechanical Properties of T91/316L Dissimilar Welding Joints |
XIAO Longren, LEI Yucheng, ZHU Qiang, LI Tianqing, CHEN Gang, LUO Meng,
ZHAO Jun, CHEN Wenbin
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| School of Material Science and Engineering, Jiangsu University, Zhenjiang 212013; |
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Abstract Dissimilar welding between T91 martensitic steel and 316L austenitic stainless steel is typically used in ultra-supercritical (USC) boilers for power plants and in the accelerator driven systems (ADS) for nuclear industry. This paper investigated the microstructure and mechanical properties of T91/316L tungsten inert gas (TIG) welding joints fabricated by three different kinds of welding wires (ER309L, ER316L and ERNiCr-3). The microstructure of three welding joints were all coarse dendritic austenitic grains with the orientation perpendicular to the fusion line. Before post welding heat treatment (PWHT), the fracture of tensile specimens all took place in T91 side CGHAZ due to the formation of the coarse grains at T91 side CGHAZ in the process of welding thermal cycle. However, after PWHT (750 ℃/1 h), the fracture locations of tensile specimens shifted to the 316L base metal and the tensile strength increased obviously, indicating that PWHT was necessary for the enhancement of the tensile strength of T91/316L dissimilar welding joints. The impact toughness of ERNiCr-3 welding seam was better than ER309L and ER316L welding seams in as-welded condition. The hardness of all samples in the as-welded condition exhibited an obvious increase in the fusion zone at T91 side, while the bump disappeared after PWHT.
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Published: 22 November 2018
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2018, Vol. 32 
