Effects of alloying elements on microstructure, hardness and growth rate of compound layer in gaseous-nitrided ferritic alloys

研究成果: Article査読

抄録

Pure iron and FeM (M = Mo, Si, Mn, Cr, Al, V) binary ferritic alloys were nitrided at 843 K for various times. Phase constituent, hardness distribution and growth rate of the compound layer are investigated by means of X-ray diffraction, EBSD, EPMA, 3DAP and nanoindentation. In pure iron, ¾ and £ A (beneath ¾) form on the surface, and voids form along the interface. The hardness of £ A is higher than ferrite matrix, while void formation causes softening of compound layer. Although alloying effects on the hardness of compound layer are small, Si, V and Al additions suppress the formation of voids, and therefore the softening is also contained. All the elements investigated increase growth rate of compound layers. Especially the Si, V and Al additions significantly accelerate their growth rate due to the presence of excess nitrogen in compound layer. However, in the case of Al-added specimen, the growth layer becomes sluggish at longer nitriding time, presumably because of the extensive precipitation of AlN into the diffusion layer.

本文言語English
ページ(範囲)596-602
ページ数7
ジャーナルMaterials Transactions
62
5
DOI
出版ステータスPublished - 2021

ASJC Scopus subject areas

  • 材料科学(全般)
  • 凝縮系物理学
  • 材料力学
  • 機械工学

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