Precipitation in a nitrogen-alloyed stainless steel at 850 C

Journal Article · Tue Jun 01 00:00:00 EDT 1993 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(93)90489-F· OSTI ID:6544933

Jargelius-Patterson, R F.A. ^[1]

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1. Swedish Inst. for Metals Research, Stockholm (Sweden)

The highly-alloyed austenitic stainless steels, with molybdenum contents typically in excess of 4 wt %, are a group of materials which are undergoing continual development due to increasing harsh user demands. Nitrogen has proved particularly attractive as an alloying element in view of its strong austenite-stabilizing tendency, beneficial effect on localized corrosion resistance and ready availability. The influence of nitrogen alloying on sensitization behavior is complex in that it increases the risk of nitride precipitation but may retard the precipitation of intermetallic phases. This has been illustrated by Thier et al for 21 Cr 25Ni 6Mo. The same has also been demonstrated to be the case for 20Cr 20-30Ni 4.5Mo steels in that the addition of 0.21 wt % nitrogen retarded the first precipitating intermetallics (principally Laves phase) but caused the appearance of Cr[sub 2]N. The present work represents an elaboration of the latter study in which the effect of various exposure times at 850 C has been investigated for the alloy containing 0.21% nitrogen in order to elucidate the precipitation reactions and equilibrium state.

• OSTI ID: 6544933
• Journal Information: Scripta Metallurgica et Materialia; (United States), Vol. 28:11; ISSN 0956-716X
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CHROMIUM-NICKEL-MOLYBDENUM STEELS
PHASE STUDIES
NITROGEN
METALLURGICAL EFFECTS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
PRECIPITATION
ALLOYS
CHROMIUM ALLOYS
CHROMIUM-NICKEL STEELS
DATA
ELEMENTS
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MICROSCOPY
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NONMETALS
NUMERICAL DATA
SEPARATION PROCESSES
STAINLESS STEELS
STEELS
360102* - Metals & Alloys- Structure & Phase Studies