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The Prediction of Microstructure in Low-chromium Substitutes for Stainless Steels.

Authors
Glenn-ML
Source
J Mater Eng 1988 10(3):181-191
Link
NIOSHTIC No.
10006578
Abstract
Previous Bureau of Mines research has shown that additions of si and al can partially replace the cr in stainless steels for use in oxidation-resistant applications. Because an austenitic microstructure is desired for optimum mechanical properties, a series of fe-(4 to 12)cr-(8 to 18)ni-(0 to 8)si-(0 to 6)al-1mn-0.05C alloys were metallographically examined to determine the compositions that stabilized this austenitic microstructure and inhibited the formation of ferrite or martensite. A series of fe- 1mn-0.05C-si-al metastable phase diagrams for various cr and ni contents were drawn to provide better predictions of alloy microstructure than does the schaeffler diagram. At the 8- to 10- pct cr level, an austenitic region is formed only when ni is at least 14 pct. An equation was developed to correlate the austenite and/or ferrite content to cr- and ni-equivalent relationships. A second equation was developed to predict the transformation of austenite to martensite. These relationships can be used to predict alloy microstructure for fe-base alloys containing 4 to 12 pct cr.
Publication Date
19880101
Document Type
OP;
Fiscal Year
1988
NTIS Accession No.
NTIS Price
Identifying No.
OP 26-89
Issue of Publication
3
NIOSH Division
ALRC;
Source Name
J. Mater. Eng., V. 10, No. 3, 1988, PP. 181-191
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