Variation in the Chemical Driving Force for Intragranular Nucleation in the Multi-pass Weld Metal of Ti-Containing High-Strength Low-Alloy Steel
- Authors
- Kang, Yongjoon; Han, Kyutae; Park, Joo Hyun; Lee, Changhee
- Issue Date
- Aug-2015
- Publisher
- ASM International
- Keywords
- ACICULAR FERRITE NUCLEATION; MN-DEPLETED ZONE; MECHANICAL-PROPERTIES; TRANSFORMATION BEHAVIOR; NONMETALLIC INCLUSION; CARBON STEELS; MICROSTRUCTURE; DEPOSITS; BAINITE; SIZE
- Citation
- Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science, v.46A, no.8, pp.3581 - 3591
- Indexed
- SCIE
SCOPUS
- Journal Title
- Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
- Volume
- 46A
- Number
- 8
- Start Page
- 3581
- End Page
- 3591
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/17457
- DOI
- 10.1007/s11661-015-2958-5
- ISSN
- 1073-5623
- Abstract
- The variation of the Mn-depleted zone (MDZ) around the inclusion during multi-pass welding of Ti-containing high-strength low-alloy (HSLA) steel was investigated by taking the changes in the impact toughness and microstructure into account. As-deposited weld metal specimens were prepared by single-pass, bead-in-groove welding, and reheated weld metal specimens were obtained by a thermal simulation technique. Two types of chemical compositions were prepared, mainly by controlling the Ti content in order to form two types of phases at inclusion/matrix interface: spinel and ilmenite. When the reheating thermal cycle is applied to the as-deposited weld metal, the MDZ depth varied depending on the inclusion surface phase; this could be explained by the competition of the homogenization effect and the dissolution effect, which occurred near the inclusion/matrix interface. In order to enhance the chemical driving force for intragranular nucleation in both as-deposited weld metal and reheated weld metal, the formation of ilmenite phase is recommended. (C) The Minerals, Metals & Materials Society and ASM International 2015
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