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Variation in the Chemical Driving Force for Intragranular Nucleation in the Multi-pass Weld Metal of Ti-Containing High-Strength Low-Alloy Steel

Title
Variation in the Chemical Driving Force for Intragranular Nucleation in the Multi-pass Weld Metal of Ti-Containing High-Strength Low-Alloy Steel
Author
이창희
Keywords
ACICULAR FERRITE NUCLEATION; MN-DEPLETED ZONE; MECHANICAL-PROPERTIES; TRANSFORMATION BEHAVIOR; NONMETALLIC INCLUSION; CARBON STEELS; MICROSTRUCTURE; DEPOSITS; BAINITE; SIZE
Issue Date
2015-08
Publisher
SPRINGER
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v. 46A, NO 8, Page. 3581-3591
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
URI
http://link.springer.com/article/10.1007/s11661-015-2958-5http://hdl.handle.net/20.500.11754/26682
ISSN
1073-5623; 1543-1940
DOI
10.1007/s11661-015-2958-5
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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