金属粉末射出成形法による高速度鋼の諸特性

Abstract

Metal Injection Molding (MIM) is becoming a cost-effective production route for relatively small, complex and high performance metal components. This process also alleviates the need for secondary working operations because of providing net shape components. This is hoped to be a suitable production route for hard materials such as high speed steels. The purpose of this work is to test the feasibility of using the MIM approach to attain the same performance properties as those of the high speed steels produced by conventional P/M processes.In this work, the debinding and sintering parameters were optimized in terms of carbon content, density and microstructure for water and gas atomized powders with different powder characteristics. Subsequently, the effect of heat treatment on the mechanical properties of those fully dense materials was investigated with the microstructure analysis. Finally, high performance properties such as a transverse ruputure strength over 3GPa and a hardness of 70HRC were obtained with full density and fine scale microstructures through the optimum heat treatments by using water atomized powder.