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首页> 外文期刊>Materials Science and Engineering. A, Structural Materials >Formation of nanocrystalline structure in carbon steels by ball drop and particle impact techniques
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Formation of nanocrystalline structure in carbon steels by ball drop and particle impact techniques

机译：通过落球和粒子撞击技术在碳钢中形成纳米晶体结构

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摘要

The formation of nanocrystalline structure on the surface of bulk steel samples was studied using ball drop and particle impact techniques. Nanocrystalline layers with several microns thick were successfully fabricated by both methods. The microstructural observations, hardness measurements and annealing experiments suggest that the nanocrystalline layers have similar characteristics with those produced by ball milling (BM). The nanocrystalline regions have sharp boundaries with work-hardened neighboring regions and no intermediate regions were observed. Pre-strain and low deformation temperature was found to enhance the formation of nanocrystalline regions. Nanocrystalline layers with large shear deformation were sometimes observed. From the measured shear strain, the equivalent true strain necessary to produce nanocrystalline region was estimated to be about 3.
机译：利用落球和粒子撞击技术研究了散装钢样品表面纳米晶体结构的形成。通过两种方法都成功地制造了具有几微米厚的纳米晶体层。微观结构观察，硬度测量和退火实验表明，纳米晶层具有与球磨（BM）产生的相似的特性。纳米晶区域与加工硬化的相邻区域具有清晰的边界，并且未观察到中间区域。发现预应变和低变形温度增强了纳米晶体区域的形成。有时观察到具有大剪切变形的纳米晶体层。根据测得的剪切应变，估计产生纳米晶体区域所需的等效真实应变约为3。

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