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Enhanced Surface Mechanical Properties and Microstructure Evolution of commercial pure titanium Under Electropulsing-Assisted Ultrasonic Surface Rolling Process

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Acta Metallurgica Sinica(English Letters) 2018年第12期31卷 1272-1280页

作者： Yong-Da Ye Xiao-Pei Li Zhi-Yan Sun Hai-Bo Wang Guo-Yi Tang Advanced Materials Institute Graduate School at ShenzhenTsinghua University School of Materials Science and Engineering Tsinghua University

The effects of electropulsing-assisted ultrasonic surface rolling process on surface mechanical properties andmicrostructure evolution of commercial pure titanium were investigated. It was found that the surface mechanical prop-erties were significantly enhanced compared to traditional ultrasonic surface rolling process （USRP）, leading to smallersurface roughness and smoother morphology with fewer cracks and defects. Moreover, surface strengthened layer wasremarkably enhanced with deeper severe plastic deformation layer and higher surface hardness. Remarkable enhancementsof surface mechanical properties may be related to the gradient refined microstructure, the enhanced severe plasticdeformation layer and the accelerated formation of sub-boundaries and twins induced by coupling effects of USRP andelectropulsing. The primary intrinsic reasons for these improvements may be attributed to the thermal and athermal effectscaused by electropulsing treatment, which would accelerate dislocation mobility and atom diffusion.

关键词： Electropulsing-assisted ultrasonic surface rolling process (EP-USRP) commercial pure titanium Roughness Hardness Microstructure evolution

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Surface nanocrystallization of commercial pure titanium by shot peening

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中国有色金属学会会刊:英文版 2004年第Z1期14卷 204-209页

作者： MA Guang LUO Yu CHEN Chun-huan REN Rui-ming WU Wei LI Zhi-qiang ZENG Yan-song School of Materials Science and Engineering Dalian Jiaotong UniversityDalian 116028China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024China

The surface nanostructures of commercial pure titanium was realized by the modified shot peening equipment commonly used in industry through the special treatment process. The results show that high-energy-shot-peening(HESP) commonly used to prepare nanostructured surface layers can be achieved by the increase of pill size, pill speed, and treatment time in the commercial shot peening equipment. XRD, SEM and TEM were used to characterize the surface layer microstructure of treated specimens. The analytic results show that the main deformation mode of commercial pure Ti is twinning. At the beginning of deformation, the dislocations are formed and twins occur within or on plane, then twins in intersection plane appear, and at last the twin characteristics disappear in the surface layer after longer treatment time. The deformation layer depth increases with treatment time in a certain period when the pill size and speed are unchanged. And in the severe plastic deformation (SPD) layer in which the twins are not identified easily by using SEM, the nanocrystalline microstructures are found under TEM. The finest grain size in the surface layer is about 40 nm, and the depth of nanostructured layers is over 60 μm. The microhardness of the nanostructured surface layers is enhanced significantly after shot peening compared with that of the initial simple.

关键词： surface nanocrystallization commercial pure titanium peening hardness

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