Funct. Mater. 2020; 27 (1): 93-99.
Dynamic mechanical properties of austenitic 304L stainless steel with different strain rates
1Department of Civil Engineering, Henan University of Science and Technology, Luoyang, China 2China Qiyuan Engineering Corporation, Xi'an, China
In this paper, the effects of different strain rate on the tensile mechanical properties of 06Cr19Ni10 austenitic stainless steel 304L at room temperature are studied. The strain rate is divided into a low strain rate range and a high strain rate range. By analyzing the law of nominal stress-strain and real stress-strain under different strain rates, the change law of strain rate sensitivity index, strain hardening strength factor and strain hardening index are obtained. The results show that the elongation and reduction of the area of austenitic stainless steel decrease with an increase of the strain rate. In the region of low strain, the decreasing range is more obvious. The curve of the stress-strain is very close to the nominal one in the low strain rate region. When the strain is greater than 0.021, the stress value increases with the increase of the strain rate. The yield strength increases with the increase of the strain rate. The strain rate sensitive index gradually approaches to zero with the increase of real strain. The hardening index shows a decreasing trend in the region of the low strain rate. The research results of this paper have some value for mastering the dynamic mechanical properties of stainless steel, and can be used to determine and optimize the process parameters of micro stamping.
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