Fine structure and interface structure of ion-bombardment nitrided layers

Fengzhao Li, Dongsheng Sun, Qing Ao, Jiyan Dai, Douxing Li, Hengqiang Ye

Research output: Journal article publicationJournal articleAcademic researchpeer-review

1 Citation (Scopus)

Abstract

The fine structure and interface structure of ion-nitrided layers in 35CrMo steel treated by ion-nitriding at 550°C for 6 h were studied with a transmission electron microscope (TEM) and a high resolution transmission electron microscope (HRTEM). The results showed that the phase γ́ (Fe4N) is a compact structure of equi-axis fine grains. The outermost layer of ion-nitriding is phase ε and γ′, which are arranged in alternating, ribbon-like strips. There are abundant vacancy, dislocation, twin and stacking fault defects. Nitrogen atoms in γ′ (Fe4N) are distributed orderly. The interface between phase ε and phase γ′ is smooth and straight and coherent. Their orientation relationships are (1 11)γ′∥ // (0001)ε and [110]γ′; // [11 20]ε. Not only the structure ledges of monoatom layer, but also those of multiatom layer were found on the interface of phase ε and phase γ′. The existence of a number of crystal defects is the main reason why bombing of ions can accelerate the nitriding process.
Original languageEnglish
Pages (from-to)579-585
Number of pages7
JournalScience in China, Series E: Technological Sciences
Volume41
Issue number6
DOIs
Publication statusPublished - 1 Jan 1998
Externally publishedYes

Keywords

  • Crystal defect
  • Fine structure
  • Interface structure
  • Ion-bombardment nitrided layer

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering(all)

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