Effect of high temperature and high strain rate on the dynamic mechanical properties of 06Cr19Ni10 austenitic stainless steel
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摘要: 采用高温分离式霍普金森（High Temperature Split Hopkinson Pressure Bar）动态试验装置，研究了06Cr19Ni10奥氏体不锈钢在温度25～300 ℃和应变率1000 ～3000 s−1下的动态力学性能。结果表明，06Cr19Ni10奥氏体不锈钢在1000～3000 s−1范围内表现出应变率强化效应，在25～300 ℃范围内表现出温度软化效应。利用扫描电子显微镜(SEM)对应变率为3000 s−1的变形试样进行微观组织研究。结果表明，高应变率下，变形带密度大，随着变形温度的增加变形带密度降低。
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关键词:
- 奥氏体不锈钢 /
- 06Cr19Ni10 /
- 高应变 /
- 温度软化 /
- 动态力学性能
Abstract: The dynamic mechanical properties of austenitic stainless steel 06Cr19Ni10 were studied by a high temperature split-Hopkinson pressure bar (SHPB) at temperatures of 25–300 ℃ and strain rates of 1000–3000 s−1. The austenitic stainless steel 06Cr19Ni10 shows strain rate strengthening effect in the range of 1000–3 000 s−1, and temperature softening effect in the range of 25–300 ℃. A scanning electron microscope (SEM) was used to observe microstructure of deformed sample at strain rate of 3 000 s−1. It is found that under high strain rate, the deformation zone density is high, and decreases as the deformation temperature increases. -
图 1 06Cr19Ni10奥氏体不锈钢在不同应变率下的真应力-真应变曲线
应变速率：(a) 1 000 s−1；(b) 1 500 s−1；(c) 2 000 s−1；(d) 2 500 s−1；(e) 3 000 s−1
Figure 1. The true stress- strain curves of 06Cr19Ni10austeniti c stainless steel deformed in different strain rates
图 2 一定应变率下真实应力与温度的关系
(a) 1 000 s−1；(b) 1 500 s−1；(c) 2 000 s−1；(d) 2 500 s−1；(e) 3 000 s−1
Figure 2. Relationship between true stress and temperature under a certain strain
图 3 （a）峰值应力与温度的关系；（b）屈服强度与温度的关系
Figure 3. (a) The relationship between peak stress and temperature; (b) The relationship between yield strength and temperature
图 4 06Cr19Ni10奥氏体不锈钢在一定温度下不同应变率的真实应力-真应变关系的比较
(a) 25 ℃；(b) 100 ℃；(c) 200 ℃；(d) 300 ℃
Figure 4. Comparison of the true strain-stress relationships of 06Cr19Ni10 austenitic stainless steel at different strain rates and fixed deformation temperatures
图 5 不同温度下ε = 0.1时真实应力与应变率的关系
Figure 5. The relationship between true stress and strain rate at ε = 0.1 at different temperatures
图 6 06Cr19Ni10奥氏体不锈钢在应变率3000 s−1下不同温度变形后的微观组织
不同放大倍数：(a)、(b) 25 ℃；(c )、(d) 100 ℃；(e) 、(f) 200 ℃；(g)、(h) 300 ℃
Figure 6. Microstructures of 06Cr19Ni10 austenitic stainless steel after deformation at different temperatures and a strain
表 1 06Cr19Ni10奥氏体不锈钢主要化学成分
Table 1. Main chemical compositions of 06Cr19Ni10 stainless steel
% C Si Mn P S Ni Cr 0.08 0.75 2.00 0.045 0.03 8.22 18.89 
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