Effect of manganese on the stability of austenite in Fe-Cr-Ni alloys

Journal Article · Wed Feb 01 04:00:00 EST 1995 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02664662· OSTI ID:6591790

Raghavan, V ^[1]

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1. Indian Inst. of Technology, New Delhi (India)

The phase equilibria between austenite and ferrite in the Fe-Cr-Mn-Ni quaternary system have been computed in the temperature range of 900 C to 1,150 C, using recent thermodynamic interaction parameters. From the computed results, the effectiveness of Mn in replacing Ni as an austenite stabilizer has been evaluated as a function of composition and temperature. The results show that, for 18 wt pct Cr alloys, the computed Ni equivalent of Mn is around zero and becomes negative at higher Cr contents, which is rather surprising. The function of Mn in 200-type stainless steels is then not so much the stabilize austenite but to supplement the role of Cr in increasing the solubility in austenite of N, which appears to be the more important austenite-stabilizing element.

• OSTI ID: 6591790
• Journal Information: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States), Journal Name: Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States) Vol. 26:2; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
DATA
ELEMENTS
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE
METALLURGICAL EFFECTS
METALS
NICKEL ALLOYS
NUMERICAL DATA
PHASE STUDIES
STAINLESS STEELS
STEELS
THEORETICAL DATA
TRANSITION ELEMENTS