Abstract
Recently, sintered components are required to have higher strength. For instance, 17-4PH stainless steel, which is a martensitic age-hardened stainless steel or a hard working material, has found wide usage in aerospace application where high strength is required, and this material is known as one of the useful materials under severe service conditions of exposure.In this study, 17-4PH stainless steel bulk was produced by using the injection moulding method, and its mechanical properties and microstructures were compared with those of wrought 17-4PH stainless steel and sintered 18-8 stainless steel.The main results obtained are summarized as follows;(1) A martensitic high strength 17-4PH stainless steel was able to be produced by the injection moulding and sintering method.(2) The pore size and shape of the sintered 17-4PH stainless steel were smaller and closer to the sphericity than those of the sintered 18-8 stainless steel.(3) The optimum solution treatment temperature of the sintered 17-4PH stainless steel was 1183K, and it was lower about 150K than that of wrought 17-4PH stainless steel.(4) The age-hardening behavior of sintered 17-4PH stainless steel was the same as that of wrought 17-4PH stainless steel.(5) In the tensile strength, sintered and aged 17-4PH stainless steel was slightly inferior to wrought 17-4PH stainless steel, but it was twice as strong as sintered 18-8 stainless steel.
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