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:
- Issue Date:
- Research Org.:
- Hanford Engineering Development Lab., Richland, WA (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 863861
- Patent Number(s):
- 4263063
- Application Number:
- 06/055210
- Assignee:
- The United States of America as represented by the United States Department of Energy (Washington, DC)
- Patent Classifications (CPCs):
-
C - CHEMISTRY C21 - METALLURGY OF IRON C21D - MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS
- DOE Contract Number:
- EY-76-C-14-2170
- Resource Type:
- Patent
- Resource Relation:
- Patent File Date: 1979 Jul 05
- 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. 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 = {1981},
month = {1}
}
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