Process and Property Trends for Powder Metallurgy Hot Isostatic Pressed A508 Grade 4N

Powder Metallurgy Hot Isostatic Press (PM-HIP) is a near-net shape forming process that has the potential to revolutionize the fabrication of large, modern-day components within the nuclear, space and defense industries. Relative to traditional manufacturing, PM-HIP Components can reduce the cost and manufacturing span times, as well as enable designs that provide a performance advantage, but are not economical to produce via forgings or castings. A key material of interest for material development via PM-HIP is the low-alloy steel, ASTM A508 Grade 4N (A508Gr4N). Within this study, various aspects of the PM-HIP process were explored to better understand the resultant mechanical properties associated with PM-HIP A508Gr4N. Variables evaluated included alternative canister materials, canister liners and HIP cycle parameters. Resultant trends associated with these unique processing conditions were correlated to material performance in an attempt to better understand the optimal achievable properties in PM-HIP A508Gr4N material.