Study on Microstructure, Tensile Test and Hardness 304 Stainless Steel Jointed by TIG Welding

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Author(s) Halil İbrahim Kurt | Ramazan Samur
Pages 163-168
Volume 2
Issue 2
Date February, 2013
Keywords TIG Welding, Austenitic Stainless Steel, Tensile Test
Abstract

In this study, microstructure evaluation and mechanical properties of 304 austenitic stainless steels (SS) jointed by tungsten inert gas (TIG) welding by using 308 stainless steel filler wire were examined. Microstructure and mechanical properties (tensile testing and hardness measurement) of the jointed material were investigated. It was observed from the tensile test result that the ultimate tensile strength is 1800 Mpa, yield strength is 75 Mpa, the breaking strength is 1520 Mpa, percent elongation and reduction area are 25%. The hardness values of welding metal (WM), base metal (BM) and HAZ are 233, 321 and 201 HV, respectively. Microstructures of BM, HAZ and WM were studied with scanning electronic microscopy (SEM) and electron dispersive spectrum (EDS) analysis, optical microscopy (OM) and stereo microscopy (SM). In weld metal chromium carbide precipitation was observed. The welding metal contains a dendrite structure (skeletal and lathy ferrite).

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