Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
neutron diffraction study山下 享介*; 古賀 紀光*; Mao, W.*; Gong, W.; 川崎 卓郎; Harjo, S.; 藤井 英俊*; 梅澤 修*
Materials Science and Engineering A, 941, p.148602_1 - 148602_11, 2025/09
被引用回数：0 パーセンタイル：0.00(Nanoscience & Nanotechnology)Ferrite-austenite duplex stainless steels offer excellent strength and ductility, making them suitable for extreme environments. In this study, 
neutron diffraction during tensile testing at 293 K and 200 K was used to investigate stress partitioning and phase-specific deformation. Phase stress was calculated using a texture-compensated method. At both temperatures, ferrite showed higher phase stress than austenite, acting as the harder phase. At 200 K, both phases exhibited increased strength and work hardening. Austenite showed significant stacking fault formation alongside dislocation migration, while ferrite retained its dislocation-based deformation mode, becoming more effective. Stress contributions from both phases were comparable. No martensitic transformation occurred. Strengthening and enhanced work hardening in both phases led to high strength at 200 K, with ductility similar to that at 293 K.
松下 慧*; 土田 紀之*; 石丸 詠一郎*; 平川 直樹*; Gong, W.; Harjo, S.
Journal of Materials Engineering and Performance, 33(13), p.6352 - 6361, 2024/07
被引用回数：3 パーセンタイル：27.49(Materials Science, Multidisciplinary)This study investigated the anisotropy of the tensile properties in a duplex stainless steel of 24Cr-5Ni-0.18N based on in situ neutron diffraction experiments. The 24Cr-5Ni-0.18N steel showed a better balance of tensile strength (TS) and uniform elongation (U.El) compared with 329J4L and 329J1 steels. The Lankford value (
-value) of the 24Cr-5Ni-0.18N steel was comparable to other duplex stainless steels while showing a larger TS. Regarding the anisotropy of the mechanical properties, the results for a test specimen oriented at 45
showed a low yield strength (YS) and TS, but a better U.El and -value. The neutron diffraction results are discussed to explain the mechanical properties.
木内 清; 下平 三郎*
防食技術, 33(1), p.24 - 32, 1984/00
ステンレス鋼の応力腐食割れに及ぼす合金元素Niの影響について、不働態皮膜の性質との観点から検討した。18%までのNiを添加した23%Crステンレス鋼を試料とし、沸騰42%MgCl
中の応力腐食割れ感受性をSSRT法で測定すると共に、造膜反応についての電気化学的測定、ESCAなどの表面分析法による表面皮膜の示性分析および溶出元素の定量分析を行い両者を比較した。3%までのNiを含むフェライト単相合金では、Ni添加量と共に応力腐食割れ感受性が著しく増大した。これはNi添加量と共に不働態疲膜の保護性が高まるが不働態化速度が遅いために活性点の局在化がより起り易くなり、割れの発生および成長が加速されるためとわかった。また複相合金がオーステナイトステンレス鋼よりも優れた耐応力腐食割れ性を示す原因が、降伏応力の低い
相による
相の機械的保護と相による相のアノード分極効果による相での割れ成長の鈍化に基づくことを明らかにした。
