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首页> 外文期刊>Journal of Materials Engineering and Performance >Yield Stress of 21-6-9 Stainless Steel Over Very Wide Ranges of Strain Rates and Temperatures
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Yield Stress of 21-6-9 Stainless Steel Over Very Wide Ranges of Strain Rates and Temperatures

机译：在很宽的应变速率和温度范围内21-6-9不锈钢的屈服应力

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摘要

The yield strength of solution-annealed 21-6-9 austenitic stainless steel was determined over a wider temperature range (−195 to 1100 °C) and strain rate (10−4 to 104 s−1) than has been previously reported. The most noteworthy characteristic of the variation of yield stress with temperature was the dramatic decrease in yield strength from −195 to 300 °C. The strain-rate sensitivity exponent, m, was determined using strain-rate change tests. m dramatically increases at about 850 °C with increasing temperature and m is approximately independent of strain (structure). Hopkinson split-bar tests from ambient temperature to 750 °C indicate that the strain-rate sensitivity of 21-6-9 is not strongly influenced by the over eight orders of magnitude change in strain rate. This suggests that the mechanism(s) of plastic flow at the higher rates is similar to that at lower rates. This contention was corroborated by transmission electron microscopy. The yield stress shows grain-size dependency.
机译：在较宽的温度范围（-195至1100°C）和应变率（10 -4 至10 4）下确定了固溶退火21-6-9奥氏体不锈钢的屈服强度 s -1 ）比以前报告的要大。屈服应力随温度变化的最值得注意的特征是屈服强度从-195急剧降低至300°C。使用应变率变化测试确定应变率灵敏度指数m。随着温度的升高，m在大约850°C时急剧增加，并且m几乎与应变（结构）无关。从环境温度到750°C的Hopkinson分离棒测试表明，应变率灵敏度的21-6-9-9不受应变率变化超过八个数量级的强烈影响。这表明较高速率下的塑料流动机理与较低速率下的相似。透射电子显微镜证实了这一观点。屈服应力显示出晶粒尺寸依赖性。

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