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Characterization of stainless steels melted under high nitrogen pressure.

Authors
Rawers-JC; Dunning-JS; Asai-G; Reed-RP
Source
Metall Trans, A, Phys Metall Mater Sci 1992 Jul; 23A:2061-2068
NIOSHTIC No.
10011661
Abstract
Mechanical properties of stainless steel increase with increasing nitrogen concentration. Currently, the maximum nitrogen concentration in commercial stainless steel is 0.8 Wt pct. In this study, type 304 and 316 stainless steels were melted and cooled in a hot-isostatic-pressure (hip) furnace using nitrogen as the pressurizing gas, producing alloys with nitrogen concentrations between 1 and 4 wt pct. These nitrogen levels exceeded the alloys' solubility limits, resulting in the formation of nitride precipitates with several different microstructures. A new phase diagram for high-nitrogen stainless steel alloys is proposed. Several properties of these nitrogen stainless steel alloys with chromium nitrides present were studied: tensile strength was proportional to the interstitial nitrogen concentration; hardness, wear, and elastic modules were proportional to the total nitrogen concentration.
CODEN
MTTABN
Publication Date
19920701
Document Type
OP; Journal Article
Fiscal Year
1992
NTIS Accession No.
NTIS Price
Identifying No.
OP 205-92
ISSN
0360-2133
NIOSH Division
ALRC
Source Name
Metallurgical Transactions. A. Physical Metallurgy and Materials Science
State
OR
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