Abstract
Hot isostatic pressing technology has been applied to produce new materials with high performance using gas atomized alloy powders as raw materials. The author has been studying the technology in order to extend the application field for a long time. High speed tool steels and alloy tool steels, bimetallic products lined with corrosion and wear resistant alloy powders, heat resistant superalloy disks etc. are described.
Mechanical and physical properties of PM high speed steels with and without a large amount of nitrogen were evaluated in comparison with conventional steels so that the difference in the roles of nitrogen and carbon in the steels and in the manufacturing processes could be made clear. The manufacturing process of bimetallic cylinders and valves and the alloy design of lining, especially the effects of alloying elements. in Co and Ni base alloys are discussed. As-HIP and HIP plus isothermal forging of superalloy disks were studied and isothermal forging of dual property disk made of different powders was also described.
