Time and flow stress dependences of internal stress during stress relaxation

被引：0
作者：
Kusuda, Yoshinori [1 ]
Murasawa, Kodai [1 ]
Suzuki, Yurina [1 ]
Suzuki, Shinsuke [1 ,2 ]
Takamura, Masato [3 ]
Hakoyama, Tomoyuki [3 ]
Ikeda, Yoshimasa [3 ]
Otake, Yoshie [3 ]
Hama, Takayuki [4 ]
机构：
[1] Waseda Univ, Fac Fundamental Sci & Engn, Dept Appl Mech & Aerosp Engn, Shinjuku Ku, 3-4-1 Okubo, Tokyo 1698555, Japan
[2] Waseda Univ, Kagami Mem Res Inst Mat Sci & Technol, Shinjuku Ku, 2-8-26 Nishiwaseda, Tokyo 1690051, Japan
[3] RIKEN, Ctr Adv Photon, 2-1 Hirosawa, Wako, Saitama 3510198, Japan
[4] Kyoto Univ, Dept Energy Sci & Technol, Sakyo Ku, Yoshida Honmachi, Kyoto 6068501, Japan
来源：
PROCEEDINGS OF THE 17TH INTERNATIONAL CONFERENCE ON METAL FORMING METAL FORMING 2018 | 2018年 / 15卷
关键词：
Stress relaxation; High tensile strength steel; Thermal activated processs; Strain-rate-change test; Stress-dip test; Strain rate dependence of flow stress; Internal stress; Dynamic recovery; Work hardening; DEFORMATION; STRAIN;
D O I：
10.1016/j.promfg.2018.07.250
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Stress relaxation is a potential cause of formability improvement. To describe stress relaxation, the measurement of internal stress is essential. We investigated the time and flow stress dependences of the internal stress by conducting a strain-rate-change test and stress-dip test. The comparison between the two tests revealed that the internal stress decreases as the stress relaxation progresses over time. Moreover, the internal stress decreases as the flow stress decreases. We propose that the time dependence of the internal stress could have been caused by the flow stress dependence of the internal stress because the flow stress-internal stress and the initial stress-internal stress relationships are approximately identical. (C) 2018 The Authors. Published by Elsevier B.V.
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页码：1746 / 1753
页数：8
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