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熊谷 正芳*; 黒田 雅利*; 松野 崇*; Harjo, S.; 秋田 貢一*
Materials & Design, 221, p.110965_1 - 110965_8, 2022/09
被引用回数:4 パーセンタイル:48.81(Materials Science, Multidisciplinary)Microstructural evolution in austenitic stainless steels during cyclic plastic deformation has been studied via diffraction line profile analysis; however, their microstructure-dependent mechanical response upon stress partitioning in the matrix (austenite) and deformation-induced martensite has remained largely unexplored. In this study, the stress response analysis of austenitic stainless steel was performed using neutron diffraction, to evaluate the phase stresses in the austenite and martensite, and the relation with dislocation data was discussed.
Zhang, X. X.*; Andr, H.*; Harjo, S.; Gong, W.*; 川崎 卓郎; Lutz, A.*; Lahres, M.*
Materials & Design, 198, p.109339_1 - 109339_9, 2021/01
被引用回数:43 パーセンタイル:94.78(Materials Science, Multidisciplinary)Here, in-situ neutron diffraction is employed to explore the residual strains, stresses, and dislocation density in the LPBF AlSi10Mg during loading-unloading-reloading deformation. It is found that the maximum residual stresses of the Al and Si phases in the loading direction reach up to about -115 (compressive) and 832 (tensile) MPa, respectively. A notable dislocation annihilation phenomenon is observed in the Al matrix: the dislocation density decreases significantly during unloading stages, and the amplitude of this reduction increases after experiencing a larger plastic deformation. At the macroscale, this dislocation annihilation phenomenon is associated with the reverse strain after unloading. At the microscale, the annihilation phenomenon is driven by the compressive residual stress in the Al matrix. Meanwhile, the annihilation of screw dislocations during unloading stages contributes to the reduction in total dislocation density.
矢野 康英; 山下 真一郎; 赤坂 尚昭; 渡辺 精一*; 高橋 平七郎
Proceedings of 9th China-Japan Symposium on Materials for Advanced Energy Systems and Fission & Fusion Engineering jointed with CAS-JSPS Core-university Program Seminar on Fusion Materials, System and Design Integration, p.2 - 5, 2007/10
PNC-FMS被覆管の照射後引張特性に及ぼす高速中性子照射効果の影響を組織面から調査した。試験片は高速実験炉「常陽」の材料照射リグを用いて照射した。照射温度は、7731013Kで、照射量は11102dpaであった。組織の安定性については、北海道大学超高圧電子顕微鏡を用いた電子線照射試験により中性子照射後の組織との比較検討を行った。