4.6 Article

Classification of martensite-austenite constituents according to its internal morphology in high-strength low alloy steel

Journal

MATERIALS LETTERS
Volume 278, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.matlet.2020.128422

Keywords

Martensite-Austenite constituent; Intercritically-reheated coarse-grained heat-affected zone; Internal morphology; Toughness; High-strength low-alloy steel

Funding

  1. Korea Evaluation Institute of Industrial Technology (KEIT) [20010583] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)

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A novel internal morphology of martensite-austenite (M-A) constituent in the intercritically-reheated coarse-grained heat-affected zone of an HSLA steel was systematically studied. Previously identified morphologies of M-A were observed on prior austenitic grain boundaries (blocky M-A) with a cored and lath morphologies (Type 1 and 2, respectively), and lath boundaries (slender M-A) with a lath morphology (Type 2). However, this work identified a new morphology, which is with a random arrangement of substructures (Type 3). Due to highly chaotic morphology (more interfaces between substructures), type 3 M-A is more likely detrimental for toughness than the other two. (C) 2020 Elsevier B.V. All rights reserved.

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