Abstract
for non-quenchable dual-phase (DP) steel sheet, the warm forming process can effectively reduce the amount of springback, and the mechanical parameters that influence its elastic and inelastic recovery to decrease exhibit a strong temperature dependence, especially under cyclic loading conditions. In this paper, the monotonic and cyclic loading tests of DP980 steel sheets are conducted at the temperatures ranging from 25 °C to 500 °C. The temperature-dependent flow stress, nonlinear elastic recovery, and Bauschinger effect are investigated. The results demonstrate that both the elastic modulus and Bauschinger effect show an exponential law with pre-strain, and decrease with the increase of forming temperature, while there will be an abnormal phenomenon of rebound due to the influence of dynamic strain aging effect. Meanwhile, a linear relationship between the Bauschinger effect and inelastic strain is observed at various temperatures, and the weight of the Bauschinger effect in the total strain reduces with temperature increasing, which indicates that the springback is dominated by linear elastic recovery. Furthermore, the U-draw bending tests are carried out to clarify the influence of Vickers hardness distribution and martensite size effect on the springback behavior.
摘要
对于不可淬火的双相钢(DP钢),温热成形技术可以显著降低其回弹量,引起其弹性和非弹性回 复降低的力学参数与温度有强烈的相关性,尤其是在循环变形条件下。本文对DP980 钢板在25~500 °C温度下进行了单轴加载和循环加载-卸载试验,研究温度相关流变应力、非线性弹性回复和包辛 格效应的演化规律。结果表明,DP980 钢板的弹性模量和包辛格效应均随预应变的增大而呈指数型演 化,并随成形温度的升高而减小。由于动态应变时效效应的影响,该演化行为会出现反弹现象。同 时,在不同温度下,包辛格效应与非弹性应变呈线性关系演化,且包辛格效应在总应变中的权重随着 温度的升高而降低,说明在较高的温度下回弹逐渐以线弹性回复为主。此外,还进行了U形拉深-弯曲 的工艺试验,以阐明维氏硬度分布和马氏体尺寸效应对回弹行为的影响。
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Projects(2020JJ4578, 2019JJ50604) supported by the Natural Science Foundation of Hunan Province, China; Project (19A499) supported by the Key Program of the Scientific Research Foundation of the Education Department of Hunan Province, China
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The overarching research goals were developed by LIN Qi-quan, WANG Zhen-zhu, DONG Wen-zheng. WANG Zhen-zhu performed the data analysis and wrote the manuscript. DONG Wen-zheng helped perform the analysis with experimental results and revised the manuscript. BU Gen and HUANG Jin-san participated in the ULUR test at elevated temperatures.
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LIN Qi-quan, WANG Zhen-zhu, DONG Wen-zheng, BU Gen, and HUANG Jin-shan declare that they have no conflict of interest.
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Lin, Qq., Wang, Zz., Dong, Wz. et al. Thermal-mechanical and springback behavior of dual-phase steel at warm temperatures. J. Cent. South Univ. 29, 1895–1905 (2022). https://doi.org/10.1007/s11771-022-5042-5
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DOI: https://doi.org/10.1007/s11771-022-5042-5