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ID 115405
Title Alternative
Precipitation Behavior of Wrought Fe-Ni-Based Alloy HR6W
Author
Iwamaru, Arata Tokyo Institute of Technology|NSK Ltd.
Terada, Yoshihiro Tokyo Institute of Technology
Keywords
iron-nickel-based alloy
age-hardening
microstructure
Laves phase
time-temperature precipitation (TTP) diagram
Content Type
Journal Article
Description
Age-hardening behavior of Fe-Ni-based alloy HR6W was investigated at the temperature range between 973 K and 1073 K. Two-step increase in hardness is detected for the alloy at each temperature; the first increase in hardness results from the precipitation of M23C6 phase and the second one corresponds to that of Laves phase. The TTP (time-temperature precipitation) diagram for the alloy is established based on the results of hardness measurement and microstructure observation, where the precipitation of Laves phase is slower than that of M23C6 phase by three orders of magnitude and the nose temperature of Laves phase is above 1073 K. The M23C6 phase precipitates with plate-like morphology along grain-boundaries at the early stage of aging, followed by the precipitation of Laves phase with granular morphology with increasing aging time. It is found that the M23C6 and Laves phases are aligned under stress condition, due to their precipitation on the dislocations introduced during creep deformation.
Journal Title
Journal of the Japan Institute of Metals and Materials
ISSN
00214876
18806880
NCID
AN00062446
Publisher
日本金属学会
Volume
83
Issue
1
Start Page
30
End Page
35
Published Date
2018-12-25
EDB ID
DOI (Published Version)
URL ( Publisher's Version )
FullText File
language
jpn
TextVersion
Publisher
departments
Science and Technology