Nondestructive testing CHD/NHD/SHD/FHD/Hardness of surface heat treatment

Hardening depths: case-hardening depth (CHD) after carburizing, nitriding hardness depth (NHD) after nitriding, surface-hardening depth (SHD) after induction hardening, and the fusion hardness depth (FHD) after laser hardening are the most important quality characteristics of surface-hardened workpieces, in addition, hardness and residual stress values at the surface and in the bulk or even the depth-profiles, all which can be tested non-destructively by 3MA technique.