Investigation of phase transformation for ferrite-austenite structure in stainless steel thin films

Noureddine Merakeb, Amel Messai, Ahmad I. Ayesh

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

Abstract

In this work we report on phase transformation of 304 stainless steel thin films due to heat treatment. Ex-situ annealing was applied for evaporated 304 stainless steel thin films inside an ultra-high vacuum chamber with a pressure of 3 × 10- 7 Pa at temperatures of 500°C and 600°C. The structure of thin films was studied by X-ray diffraction (XRD) and conversion electron Mössbauer spectroscopy (CEMS) techniques. The results revealed a transformation from α-phase that exhibits a body-centered cubic structure (BCC) to γ-phase that exhibits a face-centered cubic (FCC) due to annealing. In addition, the percentage of γ-phase structure increased with the increase of annealing temperature. Annealing thin films increased the crystal size of both phases (α and γ), however, the increase was nonlinear. The results also showed that phase transformation was produced by recrystallization of α and γ crystals with a temporal evolution at each annealing temperature. The texture degree of thin films was investigated by XRD rocking curve method, while residual stress was evaluated using curvature method.

Original languageEnglish
Pages (from-to)120-126
Number of pages7
JournalThin Solid Films
Volume606
DOIs
Publication statusPublished - May 1 2016
Externally publishedYes

Keywords

  • Ferrite-austenite
  • Stainless steel
  • Thermal evaporation
  • Thin film

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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