Microstructure and Mechanical Properties of Gradient Nanostructured Q345 Steel Prepared by Ultrasonic Severe Surface Rolling.

4区 工程技术 Q3 Physics and Astronomy Scanning Pub Date : 2023-01-01 DOI:10.1155/2023/7705844
Chao Ge, Weilong Meng, Handui Feng, Muchun Cui, Lei Dong, Tianfeng Miao, Yantong Huo, Jiemin Wu, Jing Han
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Abstract

In this work, ultrasonic severe surface rolling (USSR), a new surface nanocrystallization technique, is used to prepare gradient nanostructure (GNS) on the commercial Q345 structural steel. The microstructure of the GNS surface layer is characterized by employing EBSD and TEM, and the result indicates that a nanoscale substructure is formed at the topmost surface layer. The substructures are composed of subgrains and dislocation cells and have an average size of 309.4 nm. The GNS surface layer after USSR processing for one pass has a thickness of approximately 300 μm. The uniaxial tensile measurement indicates that the yield strength of the USSR sample improves by 25.1% compared to the as-received sample with slightly decreased ductility. The nanoscale substructure, refined grains, high density of dislocations, and hetero-deformation-induced strengthening are identified as responsible for the enhanced strength. This study provides a feasible approach to improving the mechanical properties of structural steel for wide applications.

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超声剧烈表面轧制梯度纳米结构Q345钢的组织与力学性能
采用超声剧烈表面轧制(USSR)这一新的表面纳米化技术,在Q345钢上制备了梯度纳米结构(GNS)。利用EBSD和TEM对GNS表层的微观结构进行了表征,结果表明,GNS表层最上层形成了纳米级的亚结构。亚结构由亚晶粒和位错胞组成,平均尺寸为309.4 nm。经过一次前苏联处理后的GNS表层厚度约为300 μm。单轴拉伸测试结果表明,苏联试样的屈服强度比接收试样提高了25.1%,但延性略有下降。纳米级的亚结构、精细的晶粒、高密度的位错和异质变形诱导强化被认为是提高强度的原因。本研究为提高结构钢的力学性能提供了一条可行的途径,具有广泛的应用前景。
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来源期刊
Scanning
Scanning 工程技术-显微镜技术
CiteScore
4.40
自引率
0.00%
发文量
111
审稿时长
6-12 weeks
期刊介绍: Scanning provides an international and interdisciplinary medium for the rapid exchange of information among all scientists interested in scanning electron, scanning probe, and scanning optical microscopies. Areas of specific interest include all aspects of the instrumentation associated with scanning microscopies, correlative microscopy techniques, stereometry, stereology, analytic techniques, and novel applications of the microscopies.
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