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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Dipole heights in cyclically deformed polycrystalline AISI 316L stainless steel
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Dipole heights in cyclically deformed polycrystalline AISI 316L stainless steel

机译：周期性变形的多晶AISI 316L不锈钢的偶极高度

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摘要

The purpose of this work is to investigate the frequency distributions of edge dipole heights in polycrystalline AISI 316L stainless steel cyclically deformed in the temperature range 300-873 K. The effects of grain orientation, temperature and plastic strain rate on dislocation microstructure are discussed in terms of the dipole annihilation distance (h_(min)), the critical dipole height (h_(max)), the mean dipole height < h > and the variance σ~2 of the frequency distributions of heights. The dipole annihilation distance (h_(min)) does not depend on plastic strain rate, it increases with increasing temperature and stacking fault energy. The increase of h_(min) as a function of temperature can be understood in terms of the climb of edge dislocations promoted by thermal processes (formation and diffusion of vacancies). Grain orientation does not affect the dipole annihilation distance. However, the frequency distribution of heights is clearly dependent on the grain considered. The classical relation between h_(max) and τ_μ is experimentally demonstrated in temperature range studied.
机译：这项工作的目的是研究在300-873 K温度范围内循环变形的多晶AISI 316L不锈钢中边缘偶极子高度的频率分布。讨论了晶粒取向，温度和塑性应变速率对位错微观结构的影响。偶极子distance灭距离（h_（min）），临界偶极子高度（h_（max）），平均偶极子高度和高度频率分布的方差σ〜2的关系。偶极子distance灭距离（h_（min））不取决于塑性应变率，它随温度升高和堆垛层错能量的增加而增加。 h_（min）作为温度的函数的增加可以通过由热过程（空位的形成和扩散）促进的边缘位错的爬升来理解。晶粒取向不影响偶极子distance灭距离。但是，高度的频率分布显然取决于所考虑的颗粒。在所研究的温度范围内，实验证明了h_（max）与τ_μ之间的经典关系。

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