Observations concerning transformation interfaces in steels

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90222-E· OSTI ID:5995190

Khalid, F A; Edmonds, D V ^[1]

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1. Univ. of Oxford (United Kingdom). Dept. of Materials

The transformation interfaces of pearlite, allotriomorphic cementite, M[sub 23]C[sub 6], and Widmanstaetten cementite plates in high-Mn high-C alloy steels have been studied by TEM. Linear striations in the interface have been analyzed and related to intersections with stacking faults in the parent austenite phase. Emphasis is given to the pearlite interface where it is found that the striations at the interface increased as a result of thermomechanical treatment of the austenite prior to isothermal transformation, consistent with an increased density of planar defects. The effect of heat treatment, and Si alloying additions, are also considered. Both conventional and in situ TEM of the pearlite interface showed that the linear defects stretched across both ferrite and cementite phases at the pearlite interface, apparently without any deviation or change in image contrast. The results are compared with similar ones made of the static [gamma]/[alpha] interphase boundaries in duplex stainless steel. The effect of prior deformation structure in the parent austenite on the growth and interface structure of Widmanstaetten cementite plates has also been considered.

• OSTI ID: 5995190
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:12; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CARBIDES
CARBON ADDITIONS
CARBON COMPOUNDS
CEMENTITE
HEAT TREATMENTS
INTERFACES
INTERMETALLIC COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
IRON CARBIDES
IRON COMPOUNDS
MANGANESE ALLOYS
MANGANESE STEELS
PEARLITE
PHASE STUDIES
PHASE TRANSFORMATIONS
STEELS
TRANSITION ELEMENT COMPOUNDS