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Mechanical Properties and Microstructures of Gas Tungsten Arc Welded SUS316LN Steel Reduced with Impurity Co for Basic Study of High-Power Target System

In this study, mechanical properties and microstructures of a high-strength austenitic stainless steel 316LN (SUS316LN) welded through Gas Tungsten Arc Welding (GTAW) were examined for a basic study of high-power target system such as spallation mercury target and the others. About 300-kg ingot of SUS316LN reduced with impurity cobalt (<0.002wt%), which is denoted as SUS316LN-LCo, was fabricated for reduction of residual radio-activity of the vessel after the operation, and the SUS316LN with higher strength is expected to realize the robust target vessel for higher power operation. Some properties of the welded specimen of the SUS316LN-LCo were examined in the tensile tests, Vickers hardness, and microstructural observation. The tensile properties of the welded SUS316 LN-LCo were measured at room temperature. The yield strength and tensile strength in average were about 362 and 626 MPa, respectively. The uniform elongation, total elongation and reduction area in average were about 33%, 44% and 75 %, respectively. Vickers Hardness increased in the welded region, and it was found that the increment depended on the distance from the surface. From these results, it is found that the welded SUS316LN-LCo had good mechanical properties and good weldability.