Evolution of Steel Surface Morphology During Controlled Gaseous Nitriding, Nitrocarburizing, and Oxidation

Thermochemical heat treatments are commonly used to enhance mechanical and anti-corrosion properties of various components. Some of these treatments induce considerable changes in surface topography and dimensions. Controlled gaseous nitriding is recognized as one of the best available techniques considering dimension and surface morphology stability. However, higher industry standards impose tighter control of surface finishing.

This work presents the investigation of the evolution of steel surface morphology during different stages of gaseous nitriding, nitrocarburizing and oxidation (based on Nitreg®, Nitreg®-C and ONC® technologies) using Atomic Force Microscopy and X-Ray Diffraction measurements, and demonstrates how better control of surface properties is possible.