Effect of purity on the tensile mechanical behavior of pure iron

IF 6.1 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Shujiao Deng , Wei Peng , Jiaxin Bai , Han Dong
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引用次数: 0

Abstract

The current work systematically investigated the microstructures, mechanical properties, textures, dislocation density and dislocation substructures of 3N2, 4N2 and 5N2 pure irons (3N2, 4N2 and 5N2 pure irons represent that the content of Fe are 99.9264 wt%, 99.9925 wt% and 99.9992 wt%, respectively) using SEM, EBSD, XRD and TEM. The results indicated that the recrystallization temperature decreased with increasing purity, and higher purity accelerated grain growth. 4N2 and 5N2 pure irons both presented equiaxed ferrite grains, while the microstructure of 3N2 pure iron was consisted of irregular polygonal ferrites and equiaxed ferrite grains. Low-density LAGBs were observed in annealed pure irons. The fraction of LAGBs increased significantly after deformation, and the LAGBs density decreased as the purity increased. The dislocation substructures of 3N2 and 4N2 pure irons were dominated by sub-grain boundaries with high dislocation densities and dislocation tangles, whilst 5N2 pure iron primarily consisted of fewer sub-grain boundaries and random dislocations. Work hardening was the primary strengthening contribution of pure irons. As the purity decreased, the capacity of work hardening increased, which resulted from the effective obstacles to dislocations by higher fraction of LAGBs, sub-grain boundaries with high dislocation densities and dislocation tangles. Therefore, the improved mechanical properties may be attributed to the increase of work hardening ability with the decrease of purity. 3N2 pure iron presented discontinuous yielding behavior, while 4N2 and 5N2 pure irons exhibited continuous yielding behaviors. The continuous yielding was attributed to the minimal interstitial atoms rarely segregated on mobile dislocations to form Cottrell atmosphere.
纯度对纯铁拉伸力学性能的影响
本文采用SEM、EBSD、XRD和TEM等方法系统研究了3N2、4N2和5N2纯铁(3N2、4N2和5N2纯铁中Fe含量分别为99.9264 wt%、99.9925 wt%和99.9992 wt%)的显微组织、力学性能、织构、位错密度和位错亚结构。结果表明,再结晶温度随纯度的提高而降低,高纯度有利于晶粒长大。4N2和5N2纯铁均呈现等轴铁素体晶粒,而3N2纯铁的显微组织由不规则多边形铁素体和等轴铁素体晶粒组成。在退火后的纯铁中观察到低密度LAGBs。变形后LAGBs的含量显著增加,随着纯度的增加,LAGBs密度降低。3N2和4N2纯铁的位错亚结构以高位错密度和位错缠结的亚晶界为主,而5N2纯铁的位错亚晶界较少,位错随机分布。加工硬化是纯铁的主要强化作用。随着纯度的降低,加工硬化能力增加,这是由于较高的lagb含量、高位错密度的亚晶界和位错缠结对位错的有效阻碍。因此,力学性能的改善可能是由于加工硬化能力随着纯度的降低而提高。3N2纯铁表现为不连续屈服行为,而4N2和5N2纯铁表现为连续屈服行为。连续屈服归因于最小的间隙原子很少在移动位错上分离形成Cottrell气氛。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Materials Science and Engineering: A
Materials Science and Engineering: A 工程技术-材料科学:综合
CiteScore
11.50
自引率
15.60%
发文量
1811
审稿时长
31 days
期刊介绍: Materials Science and Engineering A provides an international medium for the publication of theoretical and experimental studies related to the load-bearing capacity of materials as influenced by their basic properties, processing history, microstructure and operating environment. Appropriate submissions to Materials Science and Engineering A should include scientific and/or engineering factors which affect the microstructure - strength relationships of materials and report the changes to mechanical behavior.
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