Abstract
The dissimilar austenitic stainless steel (AISI316) and low carbon steel (AISI1018) have been welded without filler metal by CO2 4 kW laser welding. Then, the effect of Post Weld Heat-Treatment (PWHT) on the microstructure, tensile and yield strength, microhardness, phase composition in the weld zone and distribution of Ni and Cr of welded joints was investigated. As a result of remove chromium carbide formed during welding process and homogenizes the microstructure, heat treatment was carried out on the sample at 960 °C. The microstructural, fracture cross-section, phase composition and distribution of Ni and Cr of welded samples were investigated by OM, SEM and EDS. Tensile strength, yield strength and microhardness tests were employed to illustrate mechanical properties of the samples. The results designate that the welded joints had good mechanical properties after the heat treatment so that the best tensile and yield strength obtained at 960 °C. Because of reduce grain size, the heat-treatment samples show higher mechanical properties at 960 °C in comparison to as-welded.
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