金属表面渗碳 meaning in English

diffusion hardening

Eddy current testing is a method suitable for testing changes occurred in the surface or subsurface of specimen . when using this method to test carburized components , the variable of eddy current signal is depend on the change of constituents " physical property in carburized layer . so it can be used to test carburized components nondestructively
涡流检测是一种适用于试件表面和近表面变化的检测方法，利用涡流方法检测渗碳件时，涡流检测信号的变化主要取决于渗碳层组织的物理特性的变化，所以涡流检测方法可以对金属表面渗碳层深度进行检测而不构成任何破坏。