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Roles of Molybdenum and Tungsten on Reheat Cracking Susceptibility of 2.25Cr Heat Resistant Steels

Title
Roles of Molybdenum and Tungsten on Reheat Cracking Susceptibility of 2.25Cr Heat Resistant Steels
Authors
Hyun Je SUNGNam Hoe HEOKim, S.-J.
Date Issued
Jan-2017
Publisher
Nippon Tekko Kyokai/Iron and Steel Institute of Japan
Abstract
The rupture time of the tungsten-alloyed steel is much shorter than that of the molybdenum-alloyed steel. The fracture mode of the former steel is typically intergranular, but the latter steel shows a mixed fracture mode of intergranular and ductile. The shorter rupture time of the tungsten-alloyed steel is due to the active carbide formation reaction of tungsten in ferrite which depletes carbon within the matrix; the resulting higher segregation concentration of phosphorus at GCls and carbide-free PAGBs. The longer rupture time of the other steel arises from two factors: the molybdenum segregated at the interfaces as a grain boundary strengthener; the repulsive segregation between carbon and phosphorus which repels phosphorus from the interfaces and produces the lower segregation concentration of phosphorus.
URI
http://oasis.postech.ac.kr/handle/2014.oak/37155
ISSN
0915-1559
Article Type
Article
Citation
ISIJ International, vol. 57, no. 1, page. 176 - 180, 2017-01
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김성준KIM, SUNG JOON
Ferrous & Energy materials Technology
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