Cleavage fracture of austenite induced by nitrogen supersaturation

Journal Article · Thu Sep 01 04:00:00 EDT 1994 · Scripta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-716X(94)90142-2· OSTI ID:7086778

Vogt, J B; Messai, A; Foct, J ^[1]

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1. Univ. de Lille 1, Villeneuve d'Ascq (France). Lab. de Metallurgie Physique

Austenitic stainless steels and more generally FCC structure materials are good candidates for cryogenic applications because they remain ductile at low temperatures. In some cases, brittleness may occasionally occur in severe and specific conditions such as hydrogen embrittlement or during stress corrosion cracking at low strain rates. The present study shows that the brittleness observed in the P900 austenitic stainless steel is associated with the presence of a high amount of nitrogen atoms. Brittle fracture occurs both intergranularly and transgranularly. Cleavage mostly on [111] planes is associated with marked slip but with the absence of rivers. The occurrence of a DBTT is explained by the converse variations of brittle rupture stress and flow stress against nitrogen content. The flow stress increases and is mainly controlled by a short range which leads the stress for brittle rupture to be reached before the plastic flow stress.

• OSTI ID: 7086778
• Journal Information: Scripta Metallurgica et Materialia; (United States), Journal Name: Scripta Metallurgica et Materialia; (United States) Vol. 31:5; ISSN 0956-716X; ISSN SCRMEX
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
AUSTENITIC STEELS
BRITTLENESS
DATA
DUCTILE-BRITTLE TRANSITIONS
ELEMENTS
EXPERIMENTAL DATA
FRACTURE PROPERTIES
HIGH ALLOY STEELS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MECHANICAL PROPERTIES
METALLURGICAL EFFECTS
NITROGEN
NITROGEN ADDITIONS
NONMETALS
NUMERICAL DATA
STAINLESS STEELS
STEELS
YIELD STRENGTH