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Title: Phase transformations in a manganese-alloyed austenitic stainless steel

Abstract

The increasing demands placed on the corrosion resistance of stainless steels has led to the successive development of more highly alloyed materials. In this context nitrogen has shown considerable value as an alloying element but its use is restricted by a solubility limit of approximately 0.2 wt% in conventional austenitic stainless steel grades. Manganese increases the nitrogen solubility appreciably and for this reason there has also been an increased interest in its use as an alloying addition but numerous questions remain to be answered about the effect of both nitrogen and manganese on structural stability. Although much work has been published on the precipitation of secondary phases in CrNi(Mo) stainless steels, there is a relative paucity of information available on manganese-alloyed steels. Brandis et al. investigated precipitation in a 25Cr 17Ni 3Mo 6Mn 0.2Nb steel and found no manganese-enriched phases to occur. Sigma phase was the predominant intermetallic precipitate at low nitrogen contents while higher nitrogen contents retarded the onset of sigma phase precipitation but caused the appearance of chi phase. Boothby et al. investigated a 12Cr 11-35Ni (3Mo) steel in which the nickel was partially replaced by 20 or 30% manganese and found the precipitation of the intermetallic sigma,more » chi and Laves phases to be promoted by manganese, although again no manganese-enriched phases were observed. Fritscher demonstrated however the existence in the Fe-Cr-Ni system of a brittle ternary Y phase containing 30--60% manganese which was destabilized by nitrogen. The present work represents part of a study designed to gain greater understanding of the precipitation and sensitization behavior of highly alloyed austenitic stainless steels and concentrates on the influence of nitrogen additions up to 0.5wt% on precipitation of secondary phases in a 20Cr 18Ni 4.5Mo 10Mn steel.« less

Authors:
 [1]
  1. Swedish Inst. for Metals Research, Stockholm (Sweden)
Publication Date:
OSTI Identifier:
5188706
Resource Type:
Journal Article
Journal Name:
Scripta Metallurgica et Materialia; (United States)
Additional Journal Information:
Journal Volume: 30:9; Journal ID: ISSN 0956-716X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CHROMIUM-NICKEL-MOLYBDENUM STEELS; CRYSTAL-PHASE TRANSFORMATIONS; NITROGEN; METALLURGICAL EFFECTS; CORROSION RESISTANT ALLOYS; EXPERIMENTAL DATA; MICROSTRUCTURE; TRANSMISSION ELECTRON MICROSCOPY; ALLOYS; CHROMIUM ALLOYS; CHROMIUM-NICKEL STEELS; DATA; ELECTRON MICROSCOPY; ELEMENTS; HIGH ALLOY STEELS; INFORMATION; IRON ALLOYS; IRON BASE ALLOYS; MICROSCOPY; MOLYBDENUM ALLOYS; NICKEL ALLOYS; NONMETALS; NUMERICAL DATA; PHASE TRANSFORMATIONS; STAINLESS STEELS; STEELS; 360102* - Metals & Alloys- Structure & Phase Studies

Citation Formats

Jargelius-Pettersson, R F.A. Phase transformations in a manganese-alloyed austenitic stainless steel. United States: N. p., 1994. Web. doi:10.1016/0956-716X(94)90345-X.
Jargelius-Pettersson, R F.A. Phase transformations in a manganese-alloyed austenitic stainless steel. United States. https://doi.org/10.1016/0956-716X(94)90345-X
Jargelius-Pettersson, R F.A. 1994. "Phase transformations in a manganese-alloyed austenitic stainless steel". United States. https://doi.org/10.1016/0956-716X(94)90345-X.
@article{osti_5188706,
title = {Phase transformations in a manganese-alloyed austenitic stainless steel},
author = {Jargelius-Pettersson, R F.A.},
abstractNote = {The increasing demands placed on the corrosion resistance of stainless steels has led to the successive development of more highly alloyed materials. In this context nitrogen has shown considerable value as an alloying element but its use is restricted by a solubility limit of approximately 0.2 wt% in conventional austenitic stainless steel grades. Manganese increases the nitrogen solubility appreciably and for this reason there has also been an increased interest in its use as an alloying addition but numerous questions remain to be answered about the effect of both nitrogen and manganese on structural stability. Although much work has been published on the precipitation of secondary phases in CrNi(Mo) stainless steels, there is a relative paucity of information available on manganese-alloyed steels. Brandis et al. investigated precipitation in a 25Cr 17Ni 3Mo 6Mn 0.2Nb steel and found no manganese-enriched phases to occur. Sigma phase was the predominant intermetallic precipitate at low nitrogen contents while higher nitrogen contents retarded the onset of sigma phase precipitation but caused the appearance of chi phase. Boothby et al. investigated a 12Cr 11-35Ni (3Mo) steel in which the nickel was partially replaced by 20 or 30% manganese and found the precipitation of the intermetallic sigma, chi and Laves phases to be promoted by manganese, although again no manganese-enriched phases were observed. Fritscher demonstrated however the existence in the Fe-Cr-Ni system of a brittle ternary Y phase containing 30--60% manganese which was destabilized by nitrogen. The present work represents part of a study designed to gain greater understanding of the precipitation and sensitization behavior of highly alloyed austenitic stainless steels and concentrates on the influence of nitrogen additions up to 0.5wt% on precipitation of secondary phases in a 20Cr 18Ni 4.5Mo 10Mn steel.},
doi = {10.1016/0956-716X(94)90345-X},
url = {https://www.osti.gov/biblio/5188706}, journal = {Scripta Metallurgica et Materialia; (United States)},
issn = {0956-716X},
number = ,
volume = 30:9,
place = {United States},
year = {Sun May 01 00:00:00 EDT 1994},
month = {Sun May 01 00:00:00 EDT 1994}
}