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Electron Backscatter Diffraction Analysis of Joints Between AISI 316L Austenitic/UNS S32750 Dual-Phase Stainless Steel

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Abstract

Stainless steels are among the most economical and highly practicable materials widely used in industrial areas due to their mechanical and corrosion resistances. In this study, a dissimilar weld joint consisting of an AISI 316L austenitic stainless steel (ASS) and a UNS S32750 dual-phase stainless steel was obtained under optimized welding conditions by gas tungsten arc welding technique using AWS A5.4:ER2594 filler metal. The effect of welding on the evolution of the microstructure, crystallographic texture, and micro-hardness distribution was also studied. The weld metal (WM) was found to be dual-phased; the microstructure is obtained by a fully ferritic solidification mode followed by austenite precipitation at both ferrite boundaries and ferrite grains through solid-state transformation. It is found that welding process can affect the ferrite content and grain growth phenomenon. The strong textures were found in the base metals for both steels. The AISI 316L ASS texture is composed of strong cube component. In the UNS S32750 dual-phase stainless steel, an important difference between the two phases can be seen in the texture evolution. Austenite phase is composed of a major cube component, whereas the ferrite texture mainly contains a major rotated cube component. The texture of the ferrite is stronger than that of austenite. In the WM, Kurdjumov-Sachs crystallographic orientation relationship is found in the solidification microstructure. The analysis of the Kernel average misorientation distribution shows that the residual strain is more concentrated in the austenite phase than in the other phase. The welding resulted in a significant hardness increase in the WM compared to initial ASS.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, 84156-83111, Esfahan, Iran

    Morteza Shamanian, Mahyar Mohammadnezhad & Mahdi Amini

  2. Department of Natural Resources, Isfahan University of Technology, 84156-83111, Esfahan, Iran

    Azam Zabolian

  3. Department of Mechanical Engineering, University of Saskatchewan, Saskatoon, SK, S7N5A9, Canada

    Jerzy A. Szpunar

Authors
  1. Morteza Shamanian
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  2. Mahyar Mohammadnezhad
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Correspondence to Morteza Shamanian.

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Shamanian, M., Mohammadnezhad, M., Amini, M. et al. Electron Backscatter Diffraction Analysis of Joints Between AISI 316L Austenitic/UNS S32750 Dual-Phase Stainless Steel. J. of Materi Eng and Perform 24, 3118–3128 (2015). https://doi.org/10.1007/s11665-015-1597-8

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  • DOI: https://doi.org/10.1007/s11665-015-1597-8

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