Microstructural evolution of subsurface on Inconel 690TT alloy subjected to fretting wear at elevated temperature

L. Xin, B. B. Yang, Z. H. Wang, J. Li, Y. H. Lu, T. Shoji

Research output: Contribution to journalArticlepeer-review

42 Citations (Scopus)

Abstract

The subsurface layers underneath the worn surface of Inconel 690 alloy subjected to dry fretting wear at 220 °C in air were characterized. The results indicated that there are five layers: oxide layer, mixed layer, TTS layer, plastic deformation layer and base materials in the subsurface. In addition, duplex microstructure evolution took place during the fretting wear. The stable oxide layer of NiCr2O4 and Fe2O3 formed on the worn surface due to the sufficient oxidation and persistent mechanical effect, while the oxygen easily penetrated into TTS layer, which produced the mixed zone consisting of ultra-fine metal grains and oxides of NiO and Cr2O3. Amorphous structure was found in the interface between TTS and mixed zone due to the crystal defects and atomic disorder. The equiaxed-grained TTS layer formed as a consequence of large plastic strain by dynamic recrystallization, leading to disappearance of carbides in the grain boundary. Moreover, in the plastic deformation layer, grain refinement was controlled by formation of dislocation tangles and walls.

Original languageEnglish
Pages (from-to)152-161
Number of pages10
JournalMaterials and Design
Volume104
DOIs
Publication statusPublished - 2016 Aug 15

Keywords

  • Fretting wear
  • Nickel based superalloys
  • Oxidation
  • Plastic deformation

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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