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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Tensile properties and strain hardening mechanism of Cr-Mn-Si-Ni alloyed ultra-strength steel at different temperatures and strain rates
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Tensile properties and strain hardening mechanism of Cr-Mn-Si-Ni alloyed ultra-strength steel at different temperatures and strain rates

机译：不同温度和应变率Cr-Mn-Si-Ni合金超强度钢的拉伸性能和应变硬化机理

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摘要

To reveal the relationship between the microstructural morphologies, tensile behaviors, and strain hardening mechanism of Cr-Mn-Si-Ni alloyed ultra-strength steel, uniaxial tensile tests of a Cr-Mn-Si-Ni alloyed steel were conducted at room temperature (RT) and elevated temperatures with different strain rates in this study. When the tensile test was carried out at RT, increased strain rate led to increased dislocation density of the tensed Cr-Mn-Si- Ni alloyed steel specimen and resulted in increased value of yield strength. Because the dislocation entanglement and strain hardening of tensed Cr-Mn-Si-Ni alloyed steel were inhibited by increased strain rate, decreased value of ultimate strength was measured. During tensile test at RT, the dislocations rearranged and transformed to low-angle grain boundaries and highangle grain boundaries sequentially. Above microstructural evolution resulted in microstructural refinement of Cr-Mn-Si-Ni alloyed steel. The strain hardening of Cr-Mn-Si-Ni alloyed steel during tensile test at RT was divided into four stages according to the calculated values of strain hardening rate. The microstructural evolution behaviors including accumulation of dislocations, generation and transformation of slips took place in different stages of strain hardening were affected significantly by the strain rate. Based on the true stress-true strain curves, the effects of the tensile temperature and strain rate on the values of the yield strain, fracture strain, yield strength, and ultimate strength of Cr-Mn-Si-Ni alloyed steel tensed under different experimental conditions were studied. A two-stage constitutive model of Cr-Mn-Si-Ni alloyed steel associated with dislocation density was established based on the experimental results. (C) 2020 Elsevier B.V. All rights reserved.
机译：为了揭示Cr-Mn-Si-Ni合金超强钢的微观结构形态，拉伸行为和应变硬化机理之间的关系，在室温下进行CR-MN-Si-Ni合金钢的单轴拉伸试验（ RT）和本研究中具有不同应变率的温度升高。当在室温下进行拉伸试验时，提高应变速率导致加强Cr-Mn-Si-Ni合金钢样品的位错密度增加，并导致产量强度增加。因为拉伸Cr-Mn-Si-Ni合金钢的脱位缠结和应变硬化通过增加的应变速率抑制，测量了最终强度的降低。在室温下的拉伸试验期间，脱位在依次重新排列并转化为低角度晶界和亮晶界限。高于微观结构的进化导致Cr-Mn-Si-Ni合金钢的微观结构改进。根据计算的应变硬化率的值，在室温下的拉伸试验期间Cr-Mn-Si-Ni合金钢的应变硬化分为四个阶段。在不同阶段的菌株硬化阶段中发生了包括脱位的积累，发电和转化的微观结构演化行为，受到应变速率的影响。基于真正的应力 - 真菌曲线，拉伸温度和应变率的影响对不同实验下CR-MN-Si-Ni合金钢的屈服应变，断裂应变，产量强度和最终强度的影响研究了条件。基于实验结果，建立了与位错密度相关的CR-MN-Si-Ni合金钢的两阶段构成模型。 （c）2020 Elsevier B.v.保留所有权利。

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