在不同应变速率下单轴拉伸载荷作用下不锈钢试样的全场温度测量

Full-Field Temperature Measurement of Stainless Steel Specimens Subjected to Uniaxial Tensile Loading at Various Strain Rates.

作者信息

Żaba Krzysztof, Trzepieciński Tomasz, Rusz Stanislav, Puchlerska Sandra, Balcerzak Maciej

机构信息

Department of Metal Working and Physical Metallurgy of Non-Ferrous Metals, Faculty of Non-Ferrous Metals, AGH-University of Science and Technology, al. Adama Mickiewicza 30, 30-059 Cracow, Poland.

Department of Manufacturing and Production Engineering, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, al. Powst. Warszawy 8, 35-959 Rzeszów, Poland.

出版信息

Materials (Basel). 2021 Sep 13;14(18):5259. doi: 10.3390/ma14185259.

DOI:10.3390/ma14185259

PMID:34576482

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8467389/

Abstract

This article presents a study on the effect of strain rate, specimen orientation, and plastic strain on the value and distribution of the temperature of dog-bone 1 mm-thick specimens during their deformation in uniaxial tensile tests. Full-field image correlation and infrared thermography techniques were used. A titanium-stabilised austenitic 321 stainless steel was used as test materials. The dog-bone specimens used for uniaxial tensile tests were cut along the sheet metal rolling direction and three strain rates were considered: 4 × 10 s, 8 × 10 s and 16 × 10 s. It was found that increasing the strain rate resulted in the intensification of heat generation. High-quality regression models (Ra > 0.9) developed for the austenitic 321 steel revealed that sample orientation does not play a significant role in the heat generation when the sample is plastically deformed. It was found that at the moment of formation of a necking at the highest strain rate, the maximum sample temperature increased more than four times compared to the initial temperature. A synergistic effect of the strain hardening exponent and yield stress revealed that heat is generated more rapidly towards small values of strain hardening exponent and yield stress.

摘要

本文介绍了一项关于应变速率、试样取向和塑性应变对1毫米厚狗骨形试样在单轴拉伸试验变形过程中温度值及分布影响的研究。采用了全场图像相关和红外热成像技术。使用了一种钛稳定化奥氏体321不锈钢作为试验材料。用于单轴拉伸试验的狗骨形试样沿板材轧制方向切割，并考虑了三种应变速率：4×10⁻³s⁻¹、8×10⁻³s⁻¹和16×10⁻³s⁻¹。研究发现，应变速率的增加导致发热加剧。为奥氏体321钢建立的高质量回归模型（相关系数Ra>0.9）表明，当试样发生塑性变形时，试样取向在发热过程中不起显著作用。研究发现，在最高应变速率下出现颈缩的瞬间，试样的最高温度比初始温度升高了四倍多。应变硬化指数和屈服应力的协同效应表明，朝着较小的应变硬化指数和屈服应力值方向，发热更快。