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Effects of alloying elements on microstructure, hardness, and fracture toughness of centrifugally cast high-speed steel rolls

Title
Effects of alloying elements on microstructure, hardness, and fracture toughness of centrifugally cast high-speed steel rolls
Authors
Kim, CKIL Park, JLee, SKim, YCKim, NJYang, JS
POSTECH Authors
Lee, SKim, NJ
Date Issued
Jan-2005
Publisher
MINERALS METALS MATERIALS SOC
Abstract
A study was made of the effects of alloying elements oil the microstructure, hardness, and fracture, toughness of centrifugally cast high-speed steel (HSS) rolls. Particular emphasis was placed on the role of hard carbides located along solidification cell boundaries and the type of the tempered martensitic matrix. Microstructural observation, X-ray diffraction analysis, hardness and fracture-toughness measurements, and fractographic observations were conducted on the rolls. The constitution and morphology of carbides observed within the intercellular boundaries varied depending upon the predominant alloying elements that comprised them. These massive carbide formations strongly influenced the bulk material hardness and fracture toughness due to their high hardness. The effects of alloying elements were analyzed on the basis of the liquidus-surface diagram which and indicated that the proper contents of the carbon equivalent (CE), tungsten equivalent, and vanadium were 1.9 to 2.0. 10 to 11, and 5 to 6 pct, respectively. The roll material, containing a small amount of intercellular carbides and lath-type tempered martensitic matrix, had excellent fracture toughness, since carbides, were well spaced. Therefore, it was suggested that the optimization of alloying elements was required to achieve the homogeneous distribution of carbides.
URI
http://oasis.postech.ac.kr/handle/2014.oak/24838
ISSN
1073-5623
Article Type
Article
Citation
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, vol. 36A, no. 1, page. 87 - 97, 2005-01
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 LEE, SUNG HAK
Dept of Materials Science & Enginrg
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