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Surface Nanocrystallization of Pure Ni Induced by Ultrasonic Shot Peening
Science of Advanced Materials, 2014Peening is mainly used as a method of surface treatment for microstructural modification in order to improve surface mechanical properties. The ultrasonic shot peening (USP) technique can cause severe plastic deformation with its high strain rate on the surface of metallic parts.
Kejian, Li +9 more
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The Refinement of the pearlite on Surface nanocrystallization of medium steel
2011 International Conference on Remote Sensing, Environment and Transportation Engineering, 2011Nanocrystalline surface layer was fabricated on a 45 steel by using Surface mechanical treatment. The microstructure features of various sections in the surface layer were characterized by using transmission electron microscopy and X-ray diffraction. The Refinement process of the pearlite was analyzed.
null Dema Ba +2 more
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Surface nanocrystallization of C45E4 steel by ultrafast electropulsing-ultrasonic surface treatment
Journal of Wuhan University of Technology-Mater. Sci. Ed., 2017The effect of high-energy electropulsing-ultrasonic surface treatment (EUST) on the surface properties and the microstructure evolution of C45E4 steel was investigated. Refined microstructure and reduced surface roughness were obtained owing to the surface nanocrystallization process.
Long Chen +4 more
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Research on Surface Nanocrystallization of Surfacing Layer by Pre-loading Rolling Technology
Integrated Ferroelectrics, 2015The surface microstructure of the surfacing layer was optimized by refining the coarse grains to nanocrystalline by means of pre-loading rolling treatment(PLRT). By using of field emission scanning electron microscope and transmission electron microscopy observations, the microstructural features in the treated surfacing layer were characterized, and ...
Dema Ba, Fanjun Meng
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Investigation of Surface Nanocrystallization by Pre-Forceing Rolling Technology
Advanced Materials Research, 2013For solving fatigue failure of surface on the metal parts, the Surface Nanocrystallization technology by pre-forceing rolling was developed. The feature and operaing principle of equipment were introduced. A nanocrystalline surface layer was fabricated on deposited layer by using pre-forceing rolling technology (PFRT) .The microstructure of treated ...
Jia Wu He, Shi Ning Ma, De Ma Ba
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Characterization of the Mechanical Properties of Surface Nanocrystallized Materials
2011Recrystallization of the grain structure of metals into nano-sized grains by using mechanical means, has received wide attention in the last two decades. It is well known that materials with a fine-grain crystal structure have favorable properties compared to the same materials with course-grained crystal structure.
Joshua D Gale +2 more
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Long distance chemical gradient induced by surface nanocrystallization
Applied Materials Today, 2019Abstract Natural structures are wonderful examples of what can be done with a fairly limited selection of resources. Natural structures have this feature due to their complex architecture, gradient chemical compositions and microstructure. Inspired by nature, many attempts have been made to manufacture man-made materials with similar gradients (e.g ...
Qingqing Sun +5 more
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Microstructural characteristics of PEO coating: Effect of surface nanocrystallization
Journal of Alloys and Compounds, 2020Abstract The microstructural characteristics of plasma electrolytic oxidation (PEO) coating and the formation mechanism of the barrier layer in the coating were investigated. Transmission electron microscopy, high-resolution transmission electron microscopy, and scanning transmission electron microscopy-high-angle annular dark-field imaging were used
Ni Ao +3 more
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Simulation for surface self-nanocrystallization under shot peening
Acta Mechanica Sinica, 2003Driven by high frequency and multi-directional shot peens, dislocations of various orientations proliferate into the metal, and accumulate in high density in the surface layer of a shallow depth. Migration, generation and annihilation of dislocations dictate the evolution of mobile dislocation density.
MA Xinling, Wang Wei, Yang Wei
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Effect of surface nanocrystallization on the corrosion behavior of Zircaloy-4
Science in China Series E: Technological Sciences, 2009The contrastive corrosion experiments between surface nanocrystallined Zircaloy-4 and coarse-grained Zircaloy-4 under the condition of 673 K/10.3 MPa in pure water are carried out, and the microstructure of oxide films has been studied. The results indicate that the growth rate of oxide films formed on the nanocrystalline Zircaloy-4 is lower than that ...
YuTao Zhu, XiYan Zhang
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