Size Effect on Tensile Properties of Cold-Rolled ASS-304 Sheets at Various Service Temperatures

IF 0.7 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
R. B. Gou, Y. B. Ge, M. Yu, C. Y. Zhang, Y. J. Shi, W. J. Dan, N. Wang, Z. Y. Si
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Abstract

To investigate the relationship between service temperature ranging from –40~250℃, and size effect on tensile properties of thin ASS-304 sheets with nine different thicknesses (40~500 μm), uniaxial tensile tests were performed on thin ASS-304 sheets of the same average grain size in the present study. Within the thickness range of 40 to 300 μm, corresponding to η = t/d values from 1.1 to 8.1. The ultimate tensile strength (UTS), yield strength (YS), and elongation (EL) of ASS-304 exhibits a dimensional effect of “the thinner, the stronger”. For example, as the η increases from 1.1 to 8.1, the UTS rapidly decreased from 1798.8 to 839.0 MPa at 20℃, from 1703.1 to 526.9 MPa at 150℃, and from 1661.2 to 478.9 MPa at 250℃, attenuation of 53.36, 69.06, and 71.17%, respectively. Meanwhile, the YS at 20℃ are separately 1768.9 to 418.7 MPa with 1695.2 to 343.3 MPa at 150℃ as well as 1645.7 to 330.1 MPa at 250°C, decrease the proportion of 76.33%, 79.75% and 79.94% respectively. Notably, the UTS, YS, and EL at 150 and 250℃ are lower than those at 20℃. The true stress value of ASS-304 was enhanced at –20 and –40℃, and the true strain increases first and then weakens as the thickness increases, the reason is the transformation- induced-plasticity (TRIP) effect of ASS-304 in stretching. The asymptotic function describes the relationship between strength and the values of η, while the Chapman function represents the relationship between elongation and the η. A linear variation exists between service temperature and tensile properties. And relevant empirical equations including T-η- and T-η-tensile properties were established, which can predict the UTS, YS, and EL of thin ASS-304 sheets under different service temperatures.

Abstract Image

不同使用温度下尺寸对冷轧 ASS-304 板材拉伸性能的影响
为了研究-40~250℃的使用温度与粒度对九种不同厚度(40~500 μm)的 ASS-304 薄板拉伸性能的影响之间的关系,本研究对平均粒度相同的 ASS-304 薄板进行了单轴拉伸试验。在 40 到 300 μm 的厚度范围内,对应的 η = t/d 值为 1.1 到 8.1。ASS-304 的极限拉伸强度 (UTS)、屈服强度 (YS) 和伸长率 (EL) 表现出 "越薄越强 "的尺寸效应。例如,当 η 从 1.1 增加到 8.1 时,20℃ 时的 UTS 从 1798.8 快速下降到 839.0 MPa,150℃ 时的 UTS 从 1703.1 快速下降到 526.9 MPa,250℃ 时的 UTS 从 1661.2 快速下降到 478.9 MPa,分别衰减了 53.36%、69.06% 和 71.17%。同时,20℃时的 YS 分别为 1768.9 至 418.7 MPa,150℃时为 1695.2 至 343.3 MPa,250℃时为 1645.7 至 330.1 MPa,衰减比例分别为 76.33%、79.75% 和 79.94%。值得注意的是,150 和 250℃时的 UTS、YS 和 EL 均低于 20℃时的值。ASS-304 的真实应力值在 -20 和 -40℃ 时增大,随着厚度的增加,真实应变先增大后减小,其原因是 ASS-304 在拉伸过程中的转化诱导塑性效应(TRIP)。渐近函数描述了强度与 η 值之间的关系,而查普曼函数则表示伸长率与 η 值之间的关系。使用温度与拉伸性能之间存在线性变化。建立了包括 T-η- 和 T-η- 拉伸性能在内的相关经验方程,可以预测 ASS-304 薄板在不同使用温度下的 UTS、YS 和 EL。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Strength of Materials
Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-
CiteScore
1.20
自引率
14.30%
发文量
89
审稿时长
6-12 weeks
期刊介绍: Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.
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