Abstract
Abstract This paper deals with the TiN coating of a new low alloy high speed steel W3Mo2Cr4VSi. According to transmission electron microscopy and X-ray diffraction investigations, the TiN coating can be divided into two layers: the main-body layer and the transition layer. The main-body layer consists of columnar TiN which is vertical to the substrate surface, with fine-grained TiN and small amounts of ϵ-Ti 2 N between some columns. The transition layer is composed of equiaxed grains of TiN, ϵ-Ti 2 N and α-Fe. The orientation relationship between the columnar TiN and the ϵ-Ti 2 N grains in the main-body layer was found to be (101) Ti 2 N ∥ (200) TiN and [111] Ti 2 N ∥ [011] TiN . It was shown that the amount of α-Fe in the transition layer decr eased with increasing silicon content in this steel. A compressive residual stress between 180 and 200 N mm −2 exists in the coating.
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