Effects of sigma phase and carbide on the wear behavior of CoCrMo alloys in Hanks' solution

Yan Chen, Yunping Li, Shingo Kurosu, Kenta Yamanaka, Ning Tang, Yuichiro Koizumi, Akihiko Chiba

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

This study aims to elucidate the synergy effects of the σ phase and carbide on the wear behavior of low-carbon (LC) and high-carbon (HC) cobalt-chromium-molybdenum (CoCrMo) alloys, by using pin-on-disc tests under Hanks' lubricated conditions. Fractured or torn-off σ-phase precipitates were observed to be the main reason for abrasion for both LC and HC alloys. Carbides were torn off at the initial high contact pressure to form pitting; σ-phase precipitates around the pitting were uprooted and led to micro cracks, which is considered as surface fatigue of HC alloy. In contrast, strain-induced martensite observed on the worn surface was contributed to the increase of hardness and abrasion resistance of LC alloy.

Original languageEnglish
Pages (from-to)51-62
Number of pages12
JournalWEAR
Volume310
Issue number1-2
DOIs
Publication statusPublished - 2014 Feb 15

Keywords

  • Carbide
  • CoCrMo alloy
  • Contact mechanics
  • Surface fatigue
  • Wear behavior
  • σ phase

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

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