Abstract
The sintering of injection molded M2 high speed steel (HSS) was studied. The sintering parameters investigated were: sintering atmosphere, heating rate, sintering temperature and sintering time. Mechanical properties and SEM microstructures were used to determine an optimum sintering schedule. It was found that sintering in vacuum is better than in nitrogen as densification is faster in the former. In vacuum sintering, effective sintering took place in the range 1190–1210°C, whereas in nitrogen atmosphere, effective sintering occurred form 1250°C to 1270°C. A heating rate of 10°C/min is preferred since a higher heating rate of 30°C/min resulted in distortion. Near full density was obtained within 10 min after reaching an optimum sintering temperature of 1210°C. However, the maximum ultimate tensile strength of 752.6 MPa was obtained after 2 h of sintering in a vacuum.
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