Improvement of Mechanical Properties of Liquid Phase Sintered Low Alloy Steel Powder Compacts by Addition of TiC

Abstract

The effect of addition of Tic powders on the sintering behavior, microstructure and mechanical properties of atomized low alloy steel powder compacts by liquid phase sintering using Fe-Ni-B master alloy powder has been studied. The rate of grain growth during liquid phase sintering in the specimen with no additive followed a time to the 1/3 power dependence. Small amount of TiC inhibited the grain growth without having been accompanied by a lower densification rate. A good combination of 1000 MPa in strength and 7 % in elongation was obtained in the liquid phase sintered compacts added 1 % TiC with fine upper bainite structure.