H
Hassan Ghassemi Armaki
Researcher at Tohoku University
Publications - 10
Citations - 624
Hassan Ghassemi Armaki is an academic researcher from Tohoku University. The author has contributed to research in topics: Creep & Grain boundary. The author has an hindex of 9, co-authored 10 publications receiving 557 citations.
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Causes of breakdown of creep strength in 9Cr-1.8W-0.5Mo-VNb steel
TL;DR: In this paper, the authors found that Laves phase precipitates and grows during creep exposure, and the brittle fracture causes the breakdown of the brittle intergranular fracture in high-cr ferritic steels.
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Effect of precipitates on long-term creep deformation properties of P92 and P122 type advanced ferritic steels for USC power plants
Mitsuru Yoshizawa,Masaaki Igarashi,Koji Moriguchi,Atsuro Iseda,Hassan Ghassemi Armaki,Kouichi Maruyama +5 more
TL;DR: In this paper, the effect of Cr on the stability of carbonitride and formation of Z-phase during creep deformation has been explored using scanning transmission electron microscopy (STEEM).
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Creep Behavior and Degradation of Subgrain Structures Pinned by Nanoscale Precipitates in Strength-Enhanced 5 to 12 Pct Cr Ferritic Steels
TL;DR: In this paper, the degradation of subgrain structures and precipitates of Gr. 122 type xCr-2W-0.4Mo-1Cu-VNb steels were evaluated during short-term and long-term static aging and creep with regard to the Cr content of steel.
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Premature creep failure in strength enhanced high Cr ferritic steels caused by static recovery of tempered martensite lath structures
TL;DR: In this paper, the authors studied premature creep failure in Gr. 122 type steels and paid attention to sub-grains recovery of tempered martensite lath structures, showing that the sub-grain structures remain unchanged during short-term aging, whereas static recovery of subgrain structure proceeds when diffusion distance during aging becomes sufficiently long.
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Prevention of the overestimation of long-term creep rupture life by multiregion analysis in strength enhanced high Cr ferritic steels
TL;DR: In this paper, the authors used single region analysis to evaluate the long-term creep rupture life of seven kinds of heat resistant steels with different W and Cr concentrations, and the multiregion analysis was applied to each divided data set.