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Title: The effect of nitrogen on the sensitization of AISI 304 stainless steel

Abstract

Thermodynamic calculations have been used to construct time temperature sensitization (TTS) diagrams for AISI 304 stainless steels (SS). The quantitative Stawstrom and Hillert model, which is based on chromium diffusion control of sensitization, was used to calculate the TTS diagrams. Electrochemical potentiokinetic reactivation (EPR) tests were performed on these steels, with various nitrogen additions, to obtain the experimental TTS curves. The calculated and experimental TTS diagrams have been compared to better understand nitrogen addition effects on the sensitization kinetics of AISI 304 SS. These results indicate that nitrogen additions below 0.16 wt% retard the sensitization kinetics; one possible mechanism by which this is achieved is an increase in chromium concentration adjacent to the grain boundaries, which decreases the chromium concentration gradient between the austenite matrix and the grain boundaries and hence retards carbide growth.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Department of Metallurgical Engineering, Ohio State University, Columbus, OH
OSTI Identifier:
6303744
Resource Type:
Journal Article
Journal Name:
Corrosion (Houston); (United States)
Additional Journal Information:
Journal Volume: 41:10
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; NITROGEN ADDITIONS; METALLURGICAL EFFECTS; STAINLESS STEEL-304; TEMPERATURE EFFECTS; THERMODYNAMIC PROPERTIES; CALCULATION METHODS; CHROMIUM; DIFFUSION; ELECTROCHEMISTRY; GRAIN BOUNDARIES; MATERIALS TESTING; NITROGEN; POTENTIOMETRY; SENSITIVITY; ALLOYS; CHEMISTRY; CHROMIUM ALLOYS; CHROMIUM STEELS; CHROMIUM-NICKEL STEELS; CORROSION RESISTANT ALLOYS; CRYSTAL STRUCTURE; ELEMENTS; HEAT RESISTANT MATERIALS; HEAT RESISTING ALLOYS; IRON ALLOYS; IRON BASE ALLOYS; MATERIALS; METALS; MICROSTRUCTURE; NICKEL ALLOYS; NONMETALS; PHYSICAL PROPERTIES; STAINLESS STEELS; STEELS; TESTING; TITRATION; TRANSITION ELEMENTS; 360104* - Metals & Alloys- Physical Properties

Citation Formats

Mozhi, T A, Clark, A T, Johnson, W B, Macdonald, D D, and Nishimoto, K. The effect of nitrogen on the sensitization of AISI 304 stainless steel. United States: N. p., 1985. Web. doi:10.5006/1.3582983.
Mozhi, T A, Clark, A T, Johnson, W B, Macdonald, D D, & Nishimoto, K. The effect of nitrogen on the sensitization of AISI 304 stainless steel. United States. https://doi.org/10.5006/1.3582983
Mozhi, T A, Clark, A T, Johnson, W B, Macdonald, D D, and Nishimoto, K. 1985. "The effect of nitrogen on the sensitization of AISI 304 stainless steel". United States. https://doi.org/10.5006/1.3582983.
@article{osti_6303744,
title = {The effect of nitrogen on the sensitization of AISI 304 stainless steel},
author = {Mozhi, T A and Clark, A T and Johnson, W B and Macdonald, D D and Nishimoto, K},
abstractNote = {Thermodynamic calculations have been used to construct time temperature sensitization (TTS) diagrams for AISI 304 stainless steels (SS). The quantitative Stawstrom and Hillert model, which is based on chromium diffusion control of sensitization, was used to calculate the TTS diagrams. Electrochemical potentiokinetic reactivation (EPR) tests were performed on these steels, with various nitrogen additions, to obtain the experimental TTS curves. The calculated and experimental TTS diagrams have been compared to better understand nitrogen addition effects on the sensitization kinetics of AISI 304 SS. These results indicate that nitrogen additions below 0.16 wt% retard the sensitization kinetics; one possible mechanism by which this is achieved is an increase in chromium concentration adjacent to the grain boundaries, which decreases the chromium concentration gradient between the austenite matrix and the grain boundaries and hence retards carbide growth.},
doi = {10.5006/1.3582983},
url = {https://www.osti.gov/biblio/6303744}, journal = {Corrosion (Houston); (United States)},
number = ,
volume = 41:10,
place = {United States},
year = {Tue Oct 01 00:00:00 EDT 1985},
month = {Tue Oct 01 00:00:00 EDT 1985}
}