Abstract
Abstract In this study, the effect of the tool rotational speed on the microstructure evolution and its significance on the mechanical properties of friction stir welded 9Cr-1Mo (P9) steel is investigated, and its properties are compared with A-TIG welding process. Friction stir welding (FSW) was carried out at two different rotational speeds viz., 200 rpm and 500 rpm with the constant traverse speed of 30 mm/min using the W-La2O3 tool. The consequence of this study showed that irrespective of tool rotational speed, the better tensile properties are achieved by the FSW process, and it is comparable to the A-TIG welded joint. This study proved that FSW is a potential welding technique for welding of P9 steel, and also, there is scope to avoid PWHT by lowering the tool rotational speed (
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