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首页> 外文期刊>Materials Science and Engineering >Cyclic deformation behavior in a nitrogen-alloyed austenitic stainless steel in terms of the evolution of internal stress and microstructure
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Cyclic deformation behavior in a nitrogen-alloyed austenitic stainless steel in terms of the evolution of internal stress and microstructure

机译：氮合金奥氏体不锈钢在内部应力和组织演变方面的循环变形行为

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摘要

In order to understand the physical nature of cyclic deformation behavior in 316LN under uniaxial loading, the evolution of dislocation structure and density was explored by transmission electron microscopy (TEM) observation on specimens loaded with different cycles. Particular attention was paid to the evolution of internal stress which was evaluated by partitioning the hysteresis loops, and further decomposed into intergranular and intragranular components by taking into account quantitatively the heterogeneous dislocation structure. For medium and high strain amplitudes, planar dislocation structures were observed in most grains during the initial hardening stage, in which the intergranular internal stress dominates the cyclic hardening behavior. The activation of cross slip in the following softening stage not only acts to reduce intergranular internal stress, but also promotes the formation of heterogeneous dislocation distributions which acts to improve the intragranular internal stress. For low strain amplitude, no dislocation rearrangement was observed and the evolution of internal stress was determined only by its intergranular component throughout the entire cycling process.
机译：为了了解316LN在单轴载荷下循环变形行为的物理性质，通过透射电子显微镜（TEM）观察了不同载荷下的试样的位错结构和密度的变化。尤其要注意内部应力的演变，该过程通过划分磁滞回线进行评估，并通过定量考虑异质位错结构进一步分解为颗粒间和颗粒内组分。对于中等和高应变振幅，在初始硬化阶段，在大多数晶粒中观察到平面位错结构，其中晶间内应力主导循环硬化行为。在随后的软化阶段，横向滑动的激活不仅起到减少​​晶间内应力的作用，而且还促进了异质位错分布的形成，从而改善了晶内内应力。对于低应变幅度，未观察到位错重排，并且内部应力的演变仅由其在整个循环过程中的晶间成分决定。

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