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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.19 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v6.i2.10
18 pages

ROLE OF MICROSTRUCTURE INFLUENCING ON THE METHANE BUBBLE FORMATION IN THE HEAT-AFFECTED ZONE OF 3Cr-1Mo-0.25V STEEL

Dongjun Kim
Seoul National University
Soonjong Jeong
Research and Development Center, Doosan Heavy Industries & Construction Co. Ltd., Changwon, 641-792 Korea
Byunghoon Kim
Research and Development Center, Doosan Heavy Industries & Construction Co. Ltd., Changwon, 641-792 Korea
Jeongtae Kim
Research and Development Center, Doosan Heavy Industries & Construction Co. Ltd., Changwon, 641-792 Korea
Wonjae Lee
Electric and Magnetic Devices Group, Korea Electrotechnology Research Institute, Sungju-Dong 28-1, Changwon, 641-120 Korea
Chungyun Kang
Dept. of Metallurgical Engineering, Pusan National University, Pusan 609-735 Korea

ABSTRACT

Methane bubble formation in a 3Cr-lMo-0.25V steel was investigated in association with carbides formation and prior austenite grain size. The reaction between hydrogen and carbon arises the formation of methane bubbles affected by carbides as well as the prior austenite grain size. The formation of stable carbides through heat treatments led to the lowering carbon activity, and thereby giving rise to improved resistance to hydrogen attack. When the steel has larger prior austenite grain size and the larger occupancy of carbides on grain boundary, the severe hydrogen attack occurred due to the reduction of total grain boundary areas relative to the amount of bubbles.


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