Atom probe field ion microscopy study of the partitioning of substitutional elements during tempering of a low-alloy steel martensite

Journal Article · Tue Mar 01 04:00:00 EST 1994 · Metallurgical Transactions, A (Physical Metallurgy and Materials Science); (United States)

DOI:https://doi.org/10.1007/BF02651591· OSTI ID:7072960

Babu, S S ^[1]; Hono, K; Sakurai, T ^[2]

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1. Oak Ridge National Lab., TN (United States)
2. Tohoku Univ., Sendai (Japan). Institute for Materials Research

The partitioning behavior of Mn and Si at the cementite/ferrite interface during tempering of Fe-C-Si-Mn steel martensite has been studied by atom probe field-ion microscopy (APFIM). It has been shown that cementite can form without partitioning of Si and Mn during the early tempering stage at a low temperature. The atom probe compositional analysis shows no evidence of segregation or of concentration spikes of substitutional elements at the interface. This suggests that the early stage of cementite growth occurs by paraequilibrium mode and is controlled only by C diffusion in the matrix. In addition, significant C concentration fluctuations are measured in the as-quenched condition. The onset of partitioning of both Si and Mn occurs after prolonged time or by increasing the tempering temperature.

• OSTI ID: 7072960
• 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. 25:3; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101 -- Metals & Alloys-- Preparation & Fabrication
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOYS
CRYSTAL GROWTH
DISTRIBUTION
ELEMENTS
HEAT TREATMENTS
IRON ALLOYS
IRON BASE ALLOYS
MANGANESE
MARTENSITIC STEELS
METALS
PHASE STUDIES
SEMIMETALS
SILICON
STEELS
TEMPERING
TRANSITION ELEMENTS