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Effect of tungsten addition on high-temperature properties and microstructure of alumina-forming austenitic heat-resistant steels

Title
Effect of tungsten addition on high-temperature properties and microstructure of alumina-forming austenitic heat-resistant steels
Author
이창희
Keywords
Alumina-forming austenitic heat resistant steel (AFA steel); High temperature tensile test; Creep properties; Laves phase
Issue Date
2015-10
Publisher
ELSEVIER SCIENCE SA
Citation
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, v. 647, Page. 163-169
Abstract
High-temperature tensile and creep properties of W-added Alumina-Forming austenitic (AFA(W)) heat-resistant steel were investigated as compared with AFA steel without W. High-temperature tensile properties of two steels were similar to each other, but creep lifetime of AFA(W) steel was increased. Microstructural examination using SEM and TEM revealed that creep rate rapidly decreased when Laves phase initially precipitated. This indicated that the precipitation of Laves phase played an important role in hardening of AFA steel. It is also found that AFA(W) steel exhibited finer and denser Laves phase compared with AFA steel, which is due to partial substitution of W for Mo. The finer and denser distribution of Laves phase contributed to improved creep properties of AFA(W) steel by enhancement in precipitation hardening. (C) 2015 Elsevier B.V. All rights reserved.
URI
http://www.sciencedirect.com/science/article/pii/S0921509315303567http://hdl.handle.net/20.500.11754/27861
ISSN
0921-5093; 1873-4936
DOI
10.1016/j.msea.2015.09.018
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MATERIALS SCIENCE AND ENGINEERING(신소재공학부) > Articles
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