TY - JOUR
T1 - Time and flow stress dependences of internal stress during stress relaxation
AU - Kusuda, Yoshinori
AU - Murasawa, Kodai
AU - Suzuki, Yurina
AU - Suzuki, Shinsuke
AU - Takamura, Masato
AU - Hakoyama, Tomoyuki
AU - Ikeda, Yoshimasa
AU - Otake, Yoshie
AU - Hama, Takayuki
N1 - Funding Information:
This study was supported by grants from the Amada Foundation (AF-2016032).
Publisher Copyright:
© 2018 The Authors. Published by Elsevier B.V.
PY - 2018
Y1 - 2018
N2 - 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.
AB - 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.
KW - Dynamic recovery
KW - High tensile strength steel
KW - Internal stress
KW - Strain rate dependence of flow stress
KW - Strain-rate-change test
KW - Stress relaxation
KW - Stress-dip test
KW - Thermal activated processs
KW - Work hardening
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U2 - 10.1016/j.promfg.2018.07.250
DO - 10.1016/j.promfg.2018.07.250
M3 - Conference article
AN - SCOPUS:85063771982
SN - 2351-9789
VL - 15
SP - 1746
EP - 1753
JO - Procedia Manufacturing
JF - Procedia Manufacturing
T2 - 17th International Conference on Metal Forming, METAL FORMING 2018
Y2 - 16 September 2018 through 19 September 2018
ER -