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Title: Process for stabilizing dimensions of duplex stainless steels for service at elevated temperatures

Abstract

Duplex stainless steel materials containing austenite plus delta ferrite, are dimensionally stabilized by heating the material to a reaction temperature between about 1050.degree.-1450.degree. F. (566.degree.-788.degree. C.), holding it at this temperature during transformation of delta ferrite to austenite plus sigma phase, and subsequently heating to a reversion temperature between about 1625.degree.-1750.degree. F. (885.degree.-954.degree. C.), whereby the sigma phase transforms back to ferrite, but the austenite remains dispersed in the ferrite phase. Final controlled cooling permits transformation of ferrite to austenite plus sigma and, later, precipitation of carbides.

Inventors:
 [1];  [2]
  1. (Pittsburgh, PA)
  2. (Richland, WA)
Publication Date:
Research Org.:
Hanford Engineering Development Lab., Richland, WA (USA)
OSTI Identifier:
863861
Patent Number(s):
US 4263063
Assignee:
United States of America as represented by United States (Washington, DC) OSTI
DOE Contract Number:  
EY-76-C-14-2170
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
process; stabilizing; dimensions; duplex; stainless; steels; service; elevated; temperatures; steel; materials; containing; austenite; plus; delta; ferrite; dimensionally; stabilized; heating; material; reaction; temperature; 1050; degree; -1450; 566; -788; holding; transformation; sigma; phase; subsequently; reversion; 1625; -1750; 885; -954; whereby; transforms; remains; dispersed; final; controlled; cooling; permits; precipitation; carbides; delta ferrite; materials containing; stainless steels; elevated temperatures; elevated temperature; stainless steel; reaction temperature; subsequently heating; steel material; controlled cooling; duplex stainless; /148/

Citation Formats

Hull, Frederick C., and Tobin, John C. Process for stabilizing dimensions of duplex stainless steels for service at elevated temperatures. United States: N. p., 1981. Web.
Hull, Frederick C., & Tobin, John C. Process for stabilizing dimensions of duplex stainless steels for service at elevated temperatures. United States.
Hull, Frederick C., and Tobin, John C. Thu . "Process for stabilizing dimensions of duplex stainless steels for service at elevated temperatures". United States. doi:. https://www.osti.gov/servlets/purl/863861.
@article{osti_863861,
title = {Process for stabilizing dimensions of duplex stainless steels for service at elevated temperatures},
author = {Hull, Frederick C. and Tobin, John C.},
abstractNote = {Duplex stainless steel materials containing austenite plus delta ferrite, are dimensionally stabilized by heating the material to a reaction temperature between about 1050.degree.-1450.degree. F. (566.degree.-788.degree. C.), holding it at this temperature during transformation of delta ferrite to austenite plus sigma phase, and subsequently heating to a reversion temperature between about 1625.degree.-1750.degree. F. (885.degree.-954.degree. C.), whereby the sigma phase transforms back to ferrite, but the austenite remains dispersed in the ferrite phase. Final controlled cooling permits transformation of ferrite to austenite plus sigma and, later, precipitation of carbides.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Jan 01 00:00:00 EST 1981},
month = {Thu Jan 01 00:00:00 EST 1981}
}

Patent:

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