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Influence of heat treatment on the abrasive wear resistance of a Cr3C2NiCr coating deposited by an ethene-fuelled HVOF spray process

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)444-451
Number of pages8
JournalSurface and Coatings Technology
Volume291
DOIs
Publication statusPublished - 15 Apr 2016
Publication typeA1 Journal article-refereed

Abstract

This work reveals the influence of heat treatments on the microstructure, mechanical properties and abrasive wear behaviour of a Cr3C2NiCr coating deposited by an ethene-fuelled high-velocity oxygen-fuel spray process using an agglomerated-and-sintered feedstock powder. The wear resistance of an as-sprayed and heat treated (8 h at 800 °C) coating was evaluated in low- and high-stress abrasion regimes, the latter in a temperature range up to 800 °C. Precipitation of secondary carbides from the supersaturated as-sprayed binder matrix is at the core of the observed changes in the coatings wear resistance upon heat treating. This aging process renders the binder matrix softer and more ductile, as was probed by means of nanoindentation, and thereby improves its resistance against micro-cracking which is identified as an important wear mechanism in high-stress abrasion conditions.

Keywords

  • Abrasion, CrC, Heat treatment, HVOF, Mechanical properties

Publication forum classification

Field of science, Statistics Finland