Nano Precipitation in Fe-C-M Martensitic Steels During Nitriding

摘要

Nitriding is one of the most important surface treatments used in industry to increase surface hardness and improve the fatigue strength. Compared with other surface hardening treatments accompanying quenching (carburizing, induction heating and so on), this process, which utilizes precipitation hardening by fine alloy nitrides, has several advantages as listed in the following;(1) Smaller strain accompanying heat treatment(2) Higher hardness achievable(3) Excellent heat resistanceand thus, attracts more attention recently in needs of much higher precision in size scale of structural parts after heat treatment.Here we report our recent study on nano-sized precipitation of alloy nitrides in Fe-C-M (M: substitutional alloying element) martensitic steels during plasma nitriding [1]