EFFECT OF POST-WELD HEAT TREATMENT ON MICROSTRUCTURE, MECHANICAL PROPERTIES, RESIDUAL STRESSES AND ELECTROCHEMICAL BEHAVIOR OF AISI 4140 TIG WELDMENTS

Shoaib Manzoor, Muhammad Tahir, Ramzan Abdul Karim, Jinping Xiong and Muhammad Imran Khan
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Shoaib Manzoor: College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
Muhammad Tahir: ��Institute of Materials, Minerals & Mining Engineering, Abbottabad University of Science & Technology, Havelian, Abbottabad 22500, Pakistan
Ramzan Abdul Karim: ��Faculty of Materials and Chemical Engineering, Ghulam Ishaq Khan Institute of, Engineering Sciences and Technology, Topi 23640, Pakistan
Jinping Xiong: College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, P. R. China
Muhammad Imran Khan: ��Faculty of Materials and Chemical Engineering, Ghulam Ishaq Khan Institute of, Engineering Sciences and Technology, Topi 23640, Pakistan

Surface Review and Letters (SRL), 2023, vol. 30, issue 07, 1-12

Abstract: Welded structures, specifically their fusion and heat-affected zones, are majorly prone to embrittlement and enhanced corrosion due to the induced residual stresses resulting from the complexity of the heating and cooling cycles during welding. In this work, TIG welding of AISI 4140 alloy steel (chromium–molybdenum steel) was done using the filler wire ER80S-B2 (AWS A5.28) followed by post-weld heat treatment. A comparison of base metal, as-welded, and post-weld heat-treated samples is made based on residual stresses, corrosion resistance, and mechanical properties. Due to the presence of stresses and the formation of unstable martensitic structure, the as-welded samples depicted the highest corrosion rate (8.982 mpy) as compared to the post-weld heat-treated sample (5.707 mpy) which is closer to that of base metal (5.627 mpy). Post-weld heat treatment relieves the residual stresses which results in the enhancement of corrosion resistance. The tensile strength for the base metal, as-weld and PWHT samples come out to be 739, 763, and 744 MPa, respectively. Ductility, on the other hand, is restored by post-weld heat treatment which was compromised in the as-welded samples.

Keywords: TIG welding; residual stresses; post-weld heat treatment; potentiodynamic polarization; mechanical properties (search for similar items in EconPapers)
Date: 2023
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DOI: 10.1142/S0218625X23500427

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