Structure and Abrasive Wear of Composite HSS M2/WC Coating

Abstract

Features of phase-structure formation and abrasive wear resistance of composite coatings "WC-M2 steel" worn against tungsten monocarbide have been investigated. It was established that adding 20 wt.% WC to the deposited powder mixture leads to the increase in M 6 C carbide content. These carbides show a multimodal size distribution consisting of ∼5.9 μm eutectic carbides along the grain boundaries, ∼0.25 μm carbides dispersed inside the grains. Also a greater amount of metastable austenite (∼88 vol.%) is found. The high abrasive wear resistance of these coatings is provided by γ → α -martensitic transformation and multimodal size distribution of reinforcing particles.

Structure and properties of WC–Co coatings obtained on steel substrates by liquid state sintering in vacuum

“…Use of high energy sources to melt powder composites and the surface layer of the original material contributes to the development of surfacing technologies, which allow making dispersedly hardened composite coating with unique properties. [4][5][6][7][8] The main goal of surfacing is to produce such compositions as 'wear resistant coating over main metal material', which would allow use of the product under heavy working conditions and avoiding brittle destruction while retaining high surface wear resistance.…”