Journal of Materials Science

, Volume 21, Issue 9, pp 3065–3070 | Cite as

Precipitation behaviour of a sensitized AISI type 316 austenitic stainless steel in hydrogen

  • P. Rozenak
  • D. Eliezer


The purpose of this study was to characterize the precipitation behaviour of AISI type 316 steel in hydrogen. The different precipitates (M23C6, M6C), the intermetallicχ-phase and the martensitic phase (α′,ε) were determined by using transmission electron microscopy (TEM) and X-ray diffraction techniques. All the specimens were sensitized at 650‡ C for 24 h. Some samples were carburized up to 2 wt% C. Additions of carbon content decrease the time required for sensitization. Short-term (24 h) exposure of this steel to sensitization temperature results in a complex precipitation reaction of various carbides and intermetallic phases. Hydrogen was introduced by severe cathodic charging at room temperature. This study indicates that by conventional X-ray techniques it is possible to detect those precipitates and their behaviour in a hydrogen environment. The zero shift as observed by X-ray diffraction from the carbides (M23C6, M6C) and the intermetallicχ-phase, indicates that those phases absorb far less hydrogen than the austenitic matrix. TEM studies reveal that hydrogen inducesα′ martensite at chromium-depleted grain-boundary zones, near the formation of the carbides.


Carbide Martensite Austenitic Stainless Steel Stack Fault Energy Austenitic Matrix 
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Copyright information

© Chapman and Hall Ltd. 1986

Authors and Affiliations

  • P. Rozenak
    • 1
  • D. Eliezer
    • 1
  1. 1.Department of Materials EngineeringBen Gurion University of the NegevBeer ShevaIsrael

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