Mechanical Properties of As-HIPed High-Cbaron High-Chromium P/M Tool Steel

Abstract

High-chromium steel powder containing 2.2%C-18%Cr-2%Mo-1%V, called "KAD181", has been produced by gas atomization, and hot isostatically pressed (HIPed) to full density.
Microstructures and mechanical properties of as-HIPed KAD181 have been compared with those of HIPed and forged KAD181 and of conventionally cast and forged SKD11 steel (1.5%C-12%Cr). Bend strength, impact strength and fatigue properties of as-HIPed KAD181 are intermediate between those of longitudinal and transverse samples of as-forged KAD181. Wear resistance and fracture toughness of as-HIPed KAD181 are almost equivalent to those of as-forged KAD181 respectively. Mechanical properties of KAD181 are much superior to those of SKD11 except for fracture toughness, due to finer and prop homogeneous microstructure of KAD181.