Search Results 1-20 of 573

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Development of Grain Growth Promotion Technique of Ni-Based Superalloy IN713 Fabricated by Metal Injection Molding

Hibino Shinya , Fujimitsu Kazushige , Okada Ryutaro , Nomura Yoshimichi , Igashira Kenichiroh

… In this study, through investigating microstructure and high temperature strength of IN713-MIM materials in detail, we developed the technique to promote grain growth. … The creep deformation mechanism of IN713C-MIM materials is revealed that grain boundary diffusion creep was dominant as the stress exponent was determined as n = 2.72. …

MATERIALS TRANSACTIONS, 2021

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Improvement for Austenite Grain Stability During Carburizing Process Through Controlling Microstructure After Hot Forging in Case Hardening Steel [in Japanese]

宮﨑武 , 藤松威史

山陽特殊製鋼技報 27(1), 50-62, 2020
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Effect of grain boundary migration on intergranular fracture in the weld metal of steels [in Japanese]

SARUWATARI Suo , KAMO Takahiro , NAKATA Yuki , KADOI Kota , INOUE Hiroshige

… The relationship between grain boundary segregation behavior of sulfur and intergranular fracture in 10% nickel steel weld metal solidified with austenite single phase was investigated. … In the weld metal with sulfur added, sulfur is segregated at the grain boundaries, causing intergranular fracture, and the toughness is significantly deteriorated. …

QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 38(4), 222-228, 2020

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4

Interaction of Alloying Elements with Migrating Ferrite/Austenite Interface

Miyamoto Goro , Furuhara Tadashi

… Energy dissipation for interface migration is an important concept to understand the alloying effects and also to control carbon enrichment in untransformed austenite in multiphase high strength TRIP or DP steels. …

ISIJ International 60(12), 2942-2953, 2020

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5

Dissection Investigation of Forming Process of Titanium Compounds Layer in the Blast Furnace Hearth

Gao Kai , Jiao Kexin , Zhang Jianliang , Zhang Lei , Wang Cui , Gong Weimin , Zheng Jingxian , Zhang Haibin

… It was found that Ti(C, N) precipitated in the molten iron initially, and then grew up in the slag by grain boundary migration between grains. …

ISIJ International 60(11), 2385-2391, 2020

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6

Effect of Co and P on the Discontinuous Precipitation Behavior in High Concentration Corson Alloy

Horie Hiroyasu , Kammuri Kazuki , Imozuka Yuki , Tsuji Yumemaru , Watanabe Chihiro

… In all the alloys, slightly before attaining peak age-hardening within grains, DP cells nucleated at grain boundaries and grew into the grains ahead of reaction fronts. … The kinetic analyses of DP using the Turnbull (T) and Petermann and Hornbogen (P-H) models yielded grain-boundary diffusion data. … These results strongly suggested that the growth of DP cells in base and Co alloys was controlled by the boundary diffusion of Ni, and Ni or Co in Cu matrix, respectively. …

MATERIALS TRANSACTIONS 61(4), 663-667, 2020

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7

Static Recrystallization Behavior and Mechanical Properties of Heterogeneous Nanostructured Duplex Phase Stainless Steel

Miura Hiromi , Kobayashi Masakazu , Watanabe Chihiro , Sugiura Natsuko , Yoshinaga Naoki

… Because of precipitation and its impediment of grain-boundary migration, grain coarsening was strongly suppressed even by prolonged annealing to 2.59 × 105 … hardness of 5.9 GPa due to precipitation, which effectively suppressed grain growth. …

MATERIALS TRANSACTIONS 61(2), 416-419, 2020

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8

Effects of Excess C on New Grain Formation and Static Recrystallization Behavior at Shear Bands in Cold-Rolled Ultra-Low Carbon Steel Sheets [in Japanese]

Minami Hidekazu , Funakawa Yoshimasa , Tsuji Tomoki , Kobayashi Masakazu , Miura Hiromi

… Recrystallization was accelerated by the presence of solute carbon, and microstructure observation confirmed that recrystallized grains were generated at ferrite grain boundaries or deformation bands. …

Tetsu-to-Hagane 105(12), 1153-1162, 2019

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9

Simulation of voids cohesion in the vicinity of triple junction at grain boundaries in Aluminum under elevated temperature using Molecular Dynamics [in Japanese]

Takano Kanata , Hara Shotaro , Kobayashi Ken-ichi , Yamazaki Yasuhiro

… These phenomena usually happen on grain boundaries or in the vicinity of triple junction. … In order to study the mechanism of nucleation and formation of creep voids at high temperature, movements of vacancy on grain boundaries in pure Al under elevated temperatures were simulated employing the MD method. … Simulation results show that vacancies can move only on grain boundaries and formulate vacancy clusters when some tensile strain is loaded. …

The Proceedings of Conference of Kanto Branch 2019.25(0), 19C11, 2019

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10

Saturation of Grain Refinement during Severe Plastic Deformation of Single Phase Materials: Reconsiderations, Current Status and Open Questions

Renk O. , Pippan R.

… Grain refinement of materials by severe plastic deformation, investigation and understanding of their properties and phenomena has been a subject of intensive research over the last three decades. … Along with the invention and development of these processes it has been recognized, that grain refinement is not indefinite but stagnates for single phase materials. … Accordingly, the minimum grain sizes achievable are in the range between 50 and 500 nm. …

MATERIALS TRANSACTIONS 60(7), 1270-1282, 2019

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11

Formation of Oriented and Graded Grain Structure in Fe-Cu-C Alloy by Liquid Phase Sintering and Carburization

Watanabe Ryuzo , Okita Yasuaki , Kawasaki Akira

… The possible mechanism of the formation of the microstructure has been proposed, in which a concurrent effect of chemically driven liquid film migration, and the decrease in the grain boundary energy, both originated from carbon dissolution, as well as of the surface flattening by capillarity, is the main cause for the formation of oriented and elongated grains. …

Journal of Functionally Graded Materials 33(0), 23-27, 2019

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12

Development of Grain Growth Promotion Technique of Ni-based Superalloy IN713 Fabricated by Metal Injection Molding [in Japanese]

HIBINO Shinya , FUJIMITSU Kazushige , OKADA Ryutaro , NOMURA Yoshimichi , IGASHIRA Kenichiroh

… In this study, through investigating microstructure and high temperature strength of IN713-MIM materials in detail, we developed the technique to promote grain growth. … The creep deformation mechanism of IN713C-MIM materials is revealed that grain boundary diffusion creep was dominant as the stress exponent was determined as n = 2.72. …

Journal of the Japan Society of Powder and Powder Metallurgy 66(1), 17-22, 2019

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13

Development of three-dimensional simulation method of the void migration caused by electromigration in the interconnect line with bamboo structure [in Japanese]

ISHII Akimitsu , YAMANAKA Akinori

… Because the voids cause the disconnection of the interconnect line and lead to the electronic circuit failure, the prediction of the void migration caused by EM is important to improve the reliability of the interconnect line. … Therefore, this study proposes a new multi-phase-field (MPF) model to simulate the void migration by EM in a polycrystalline interconnect. …

The Proceedings of The Computational Mechanics Conference 2018.31(0), 091, 2018

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14

Accuracy evaluation of grain growth simulations with different multi-phase-field models [in Japanese]

MIYOSHI Eisuke , TAKAKI Tomohiro , Ohno Munekazu , SHIBUTA Yasushi

… The multi-phase-field (MPF) method is widely employed in recent years as a prominent tool for simulating polycrystalline grain growth, since it enables us to handle complicated grain boundary migration without explicitly tracking the positions of grain boundaries. …

The Proceedings of The Computational Mechanics Conference 2018.31(0), 020, 2018

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15

Effect of B on Growth of Recrystallized Grain of Ti-added Ultra-low Carbon Cold-rolled Steel Sheets

Haga Jun , Sawada Hideaki , Ushioda Kohsaku

… The effect of boron (B) on the recrystallization behavior, in particular the growth of the recrystallized grain into the unrecrystallized grain, of titanium (Ti) added interstitial atom free (IF) steel sheets was studied from the viewpoint of the solute-drag effect considering the interaction between B and Ti atoms. … The growth rate of the recrystallized grain at 5% fraction recrystallized decreased with increasing the B content. …

ISIJ International 58(10), 1901-1909, 2018

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16

Three-dimensional EBSD Analysis and TEM Observation for Interface Microstructure during Reverse Phase Transformation in Low Carbon Steels

Hata Kengo , Fujiwara Kazuki , Kawano Kaori , Sugiyama Masaaki , Fukuda Takashi , Kakeshita Tomoyuki

… Formation of austenite during the initial stage of reverse transformation from the recrystallized ferrite in low carbon steel has been studied from the view-point of the orientation relationships and the interphase boundary structure. … electron backscattering diffraction (EBSD) measurement of austenite grain growth during the reverse transformation indicates that the different migration behaviors according to different α/γ …

ISIJ International 58(4), 742-750, 2018

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17

Austenite Grain Growth Kinetics after Isothermal Deformation in Microalloyed Steels with Varying Nb Concentrations

Annan Kofi Ahomkah , Siyasiya Charles Witness , Stumpf Waldo Edmund

… Grain growth equation constants n, Q … The constants from these treatments were then used to develop constitutive equations that incorporate the initial grain size Do … and a Nb-effect for grain growth predictions in these steels. … The activation energy for grain boundary migration Q …

ISIJ International 58(2), 333-339, 2018

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18

Ultra-large single crystals by abnormal grain growth

Kusama Tomoe , Omori Toshihiro , Saito Takashi , Kise Sumio , Tanaka Toyonobu , Araki Yoshikazu , Kainuma Ryosuke

… Here we show that an extraordinarily large Cu-Al-Mn single crystal can be obtained by abnormal grain growth (AGG) induced by simple heat treatment with high mass productivity. … In AGG, the sub-boundary energy introduced by cyclic heat treatment (CHT) is dominant in the driving pressure, and the grain boundary migration rate is accelerated by repeating the low-temperature CHT due to the increase of the sub-boundary energy. …

Nature Communications (8), 2017-08-25

IR
19

Effect of B on Growth of Recrystallized Grain of Ti-added Ultra-low Carbon Cold-rolled Steel Sheets [in Japanese]

Haga Jun , Sawada Hideaki , Ushioda Kohsaku

… The effect of boron (B) on the recrystallization behavior, in particular the growth of the recrystallized grain into unrecrystallized grain, of titanium (Ti) added interstitial atom free (IF) steel sheets was studied from the viewpoint of the solute drag effect considering the interaction between B and Ti atoms. … The growth rate of the recrystallized grain at 5% fraction recrystallized decreased with increasing B content. …

Tetsu-to-Hagane 103(5), 221-229, 2017

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20

Modeling of Phosphorus Transport by Interstitial Dumbbell in α−Iron Using First-Principles-Based Kinetic Monte Carlo

Ebihara Ken-ichi , Suzudo Tomoaki , Yamaguchi Masatake

… The evaluated diffusion coefficient has been compared with both that for the migration mode via octahedral interstitial sites and that for the migration mode of the vacancy mechanism estimated previously using a first-principles-based kinetic Monte Carlo simulation. … As a result, we have confirmed that the phosphorus diffusion by the two interstitial migration modes is much faster than that of the vacancy migration mode. …

MATERIALS TRANSACTIONS 58(1), 26-32, 2017

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