Abstract
Spray Forming is a material processing technology in which molten metal is transformed into near net shape solid by capturing spray of atomized metal or alloy onto a moving substrate. In the present work, performance of spray formed tool steel, H13 is investigated in terms of tensile, Charpy impact and fracture toughness properties which are then compared with that of conventional route steel. The analysis was done in two hardness ranges i.e. 44~46 HRc and 48~50 HRc. Tensile test results show that YS, UTS, %El and %RA are similar for both route materials at both hardness ranges. Charpy impact strength obtained for spray formed route steel is lower in all three directions as compared to that of conventional route steel. Fracture toughness results, at higher hardness range, show that KIC value obtained for spray formed route steel is approximately 19.5% & 33.3% lower than that of conventional route steel in LS and TS orientations, respectively. The same at lower hardness range is approximately 28.7% and 24.8% lower for spray formed route steel when compared with that of conventional rote steel in LS and TS orientations, respectively. Metallography and SEM has been done to establish reasons behind the better performance of conventional route steel.
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