The Formation Mechanism of Ground White Layers

Abstract

This paper deals with formation mechanism of ground white layers in relation to grinding temperature and grinding heat energy. Obtained results are as follows : 1) A ground white layer is formed during a rapid cooling process of a workpiece, which follows the generation of grinding heat energy. 3) The structure Of the ground White layer consists of fine α-phase, α'-phase, fine recrystalized γ_R-phase and fine secondary Fe₃C-phase, Fe₃O₄ and FeO-phase. 3) Hardness of ground white layers is increased because (1) fine untempered martensite contains a greater quantity of carbon in the super-saturated state in the base α-phase, and (2) the fine secondary Fe₃C-phase precipitates.