دورية أكاديمية
Tensile deformation behavior of TRIP-aided bainitic ferrite steel in the post-necking strain region
| العنوان: | Tensile deformation behavior of TRIP-aided bainitic ferrite steel in the post-necking strain region |
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| المؤلفون: | Takashi Matsuno, Tomohiko Hojo, Ikumu Watanabe, Ayumi Shiro, Takahisa Shobu, Kentaro Kajiwara |
| المصدر: | Science and Technology of Advanced Materials: Methods, Vol 1, Iss 1, Pp 56-74 (2021) |
| بيانات النشر: | Taylor & Francis Group, 2021. |
| سنة النشر: | 2021 |
| المجموعة: | LCC:Materials of engineering and construction. Mechanics of materials |
| مصطلحات موضوعية: | advanced high-strength steel, large strain, stress-triaxiality, small round-bar tensile test, synchrotron x-ray diffraction, finite element simulation, Materials of engineering and construction. Mechanics of materials, TA401-492 |
| الوصف: | Transformation induced plasticity (TRIP) steels present a remarkable balance of strength and ductility. However, their post-necking hardening behavior, which is required for press-forming and automobile crash simulation, is unreliable because of their stress-triaxiality dependency. Therefore, we analyzed the stress-triaxiality hardening in the post-necking strain regions of tensile loaded TRIP steel to accurately evaluate the stress and strain distribution. Tensile tests were accordingly conducted on small, round-bar specimens to evaluate the true stress vs. cross-sectional reduction ratio curves up to fracture. Additionally, the stress distribution inside each specimen was measured using synchrotron X-ray diffraction. Using these measurements, the hardening law for the TRIP steel was identified through a series of finite element (FE) simulations, in which a simplified phenomenological strain and stress-triaxiality hardening were found to agree well with the measurements in the post-necking strain region. As a result, the hardening rate of the TRIP steel showed a sudden decrease at the uniform elongation limit strain. The FE simulations including stress-triaxiality hardening successfully reproduced this hardening behavior up to the fracture, and the FE simulation including stress-triaxiality hardening and its saturation presented values closest to the XRD measurements. This simulation also agreed well with the measurements obtained in the tensile direction away from the neck center. A microstructural analysis of the retained austenite at the neck supported this result. The FE simulations revealed that a combination of the TRIP effect and its deactivation accelerates the localized deformation at the specimen neck under tensile loading. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 2766-0400 27660400 |
| Relation: | https://doaj.org/toc/2766-0400 |
| DOI: | 10.1080/27660400.2021.1922207 |
| URL الوصول: | https://doaj.org/article/5c4c01f73b974b7b895a3e398391017f |
| رقم الأكسشن: | edsdoj.5c4c01f73b974b7b895a3e398391017f |
| قاعدة البيانات: | Directory of Open Access Journals |
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Full Text Finder | تدمد: | 27660400 |
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| DOI: | 10.1080/27660400.2021.1922207 |