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Surface nanocrystallization of commercial pure titanium by shot peening

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 University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 China Beijing Aeronautical Manufacturing Technology Research Institute Beijing 100024 China

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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Effect of shot peening on microstructure,nanocrystallization and microhardness of Ti-10V-2Fe-3Al alloy surface

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Journal of Iron and Steel Research(International) 2019年第1期26卷 52-58页

作者： Hai-zhong Zheng Sheng-hua Guo Qin-hao Luo Xiao-yong Shu Gui-fa Li National Defense Key Disciplines Laboratory of Light Alloy Processing Science and Technology Nanchang Hangkong UniversityNanchang 330063JiangxiChina

Severe plastic deformation of Ti-10V-2Fe-3Al alloy in the surface region was caused by shot peening at air pressure of 0.6 MPa with processing time ranging from 1 to 45 min.The results showed that the thickness of surface deformation layer was proportio nal to the processing time,the microhardness of the shot-peened surface in creased from 280 to 385 HV,and the depth of highly hardening layers arrived at 200μm.It was worth noting that a grain size gradient from nanocrystalline on the surface toward coarse grain in the matrix was obtained during the shot peening process and the minimum grain size in the top surface after shot peening was about 100-200 nm.

关键词： Ti-10V-2Fe-3Al alloy Shot peening treatment Surface nanocrystallization Martensitic transformation Microhardness

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Effects of shot peening and laser remelting on oxygen-permeation treatment of titanium alloy

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中国有色金属学会会刊：英文版 2004年第Z1期14卷 268-273页

作者： MA Hong-yan WANG Mao-cai WEI Zheng XIN Gong-chun State Key Laboratory for Corrosion and Protection Institute of Metal Research Graduate School of Chinese Academy of Sciences Beijing 100030 China State Key Laboratory for Corrosion and Protection Institute of Metal Research Graduate School of Chinese Academy of Sciences Beijing 100030 China Shenyang Liming Aero-engine Group Corporation Shenyang 110043 China Shenyang Liming Aero-engine Group Corporation Shenyang 110043 China

The influence of surface pre-treatments, shot-peening (SP) and laser remelting (LR), on oxygen permeation behaviors of titanium alloy TC11 was investigated. Optical microscope, SEM with EDAX, XRD, and microhardness tester were employed to characterize the microstructure, composition and hardness of this alloy. The results show that the surface roughness is increased by shot-peening, and the microstructure with fine-grain can be obtained by LR pre-treatment. The pre-treated samples were oxygen-permeated at (810± 10) ℃ for 10 h in atmospheric air. The outer layer consists essentially of TiO2, trace Ti2 N, Ti3Al and Ti3AlN for the SP pre-treatment and thin oxygen solution layer is found in the subsurface layer. As for LR pre-treatment, the outer layer consists mainly of TiO2 and small amounts of TiO, and the inner layer consists of alpha crystals, rich in interstitial atoms. Samples by LR pre-treatment has thicker hardened layer with higher hardness values in comparison with SP pre-treated ones.The boost diffusion of oxygen and hardening mechanisms were discussed based on the experimental results.

关键词： shot peening laser remelting oxygen-permeation titanium solution

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Enhancing the surface hardness and roughness of engine blades using the shot peening process

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International Journal of Minerals,Metallurgy and Materials 2019年第8期26卷 999-1004页

作者： Mohammad A.Omari Hamzah M.Mousa Faris M.AL-Oqla Mohammad Aljarrah Department of Mechanical Engineering Jordan University of Science and TechnologyIrbid 22110Jordan Department of Mechanical Engineering The Hashemite UniversityZarqa 13133Jordan Department of Industrial Engineering The Hashemite UniversityZarqa 13133Jordan

The effects of shot peening on the mechanical properties of steel 1070 were studied to enhance the material’s properties and surface characteristics.In this study,pressure and exposure time were the main parameters governing surface hardness and surface roughness.The optimal time duration and pressure were determined after several experimental trials.Changes in hardness and surface roughness were monitored as the pressure of the shot and the exposure time were varied.Furthermore,the microstructure was evaluated by scanning electron microscopy(SEM)and the images were enhanced by image processing techniques to evaluate the surface changes.Pareto charts were constructed to estimate the effects of pressure and time on both surface hardness and surface roughness.The novelty of this study is the concentration on engine blades which are frequently used in aircrafts to determine the optimal time–pressure combination for shot peening to achieve suitable mechanical and surface properties.The results show that shot peening pressure(up to 482.6 kPa for 7 min)has positive effect on enhancing the surface and mechanical properties for steel 1070 blades;however,an increase in either pressure or time above that level adversely affected both surface hardness and surface roughness.

关键词： shot peening roughness hardness engine blades scanning electron microscopy

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Surface nanostructures in commercial pure Ti induced by high energy 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 215-218页

作者： CHEN Chun-huan REN Rui-ming ZHAO Xiu-juan ZHANG Yu-jun School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China School of Materials Science and Engineering Dalian Jiaotong University Dalian 116028 China

The high-energy shot peening (HESP) technique was used to obtain the surface nanocrystalline microstructure for a hcp metal titanium. XRD, SEM and TEM were applied to characterize the microstructure of the surface layer. Large amount of the deformation twins in the surface layer were observed by SEM in the specimens after HESP treatment in a shot-time, and the number of deformation twins both in a single plane and in intersecting planes increases with HESP time, until the twin character disappears completely in the top surface layer, which means that the severe plastic deformation(SPD) occurs on the surface. The XRD analysis results show that after HESP treatmen for 30 - 60 min the surface grain size decreases to nanoscale. According to the TEM images and corresponding diffraction patterns from SPD areas of the 120 min-treatment specimen, the measured grain size near the surface is about 20 - 30 nm. The grain size in deformation layer increases with the depth from the surface, and the nanostructured layer is about 20 μm in depth. Therefore, the surface nanocrystalline and a gradient microstructure from the surface to the matrix are obtained, which results in the micro-hardness decreasing from surface to the matrix gradually.

关键词： surface nanocrystallization shot peening commercial pure Ti

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Modeling thermal and mechanical cancellation of residual stress from hybrid additive manufacturing by laser peening

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Nanotechnology and Precision Engineering 2019年第2期2卷 49-60页

作者： Guru Madireddy Chao Li Jingfu Liu Michael P.Sealy Mechanical and Materials Engineering Department University of NebraskaLincolnNE68588USA Autodesk Inc. 200 Innovation Blvd.Suite 208State CollegePA 16803USA Sentient Science Corporation 672 Delaware AvenueBuffaloNY 14209USA

Additive manufacturing(AM)of metals often results in parts with unfavorable mechanical properties.Laser peening(LP)is a high strain rate mechanical surface treatment that hammers a workpiece and induces favorable mechanical properties.peening strain hardens a surface and imparts compressive residual stresses improving the mechanical properties of a material.This work investigates the role of LP on layer-by-layer processing of 3D printed metals using finite element analysis.The objective is to understand temporal and spatial residual stress development after thermal and mechanical cancellation caused by cyclically coupling printing and peening.Results indicate layer peening frequency is a critical process parameter affecting residual stress redistribution and highly interdependent on the heat generated by the printing process.Optimum hybrid process conditions were found to exists that favorably enhance mechanical properties.With this study,hybrid-AM has ushered in the next evolutionary step in AM and has the potential to profoundly change the way high value metal goods are manufactured.

关键词： Additive manufacturing Laser peening Finite element analysis Residual stress Hybrid

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Influence of Shot peening Treatment on the Fatigue and Corrosion Resisting Properties of 2Cr13 Stainless Steel

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稀有金属材料与工程 2012年第S1期41卷 236-238页

作者： Liu Mingxia Zhang Haicun Liu Daoxin Han Zengfu Zhi Jinhua Guo Wenyong Zhou Yafeng Xian Shaangu Power CO LTD Xian 710075 Peoples R China NW Polytech Univ Xian 710072 Peoples R China

In the present paper,shot peening treatments were used to strengthen the steel surface,and the influence on the fatigue and corrosion resisting properties of 2Cr13 stainless steel was examined.The residual stress and the surface roughness were investigated by XRD and AFM.The characteristics of fatigue and corrosion resistance have also been analyzed by bending fatigue and salt spray tests.The result reveals that the fatigue limit of the samples is improved dramatically with the increasing of the peening strength by 7.5%.Meanwhile,the peenging angle has no evident influence on the fatigue properties.Compared with the untreated samples,the acid corrosion weight loss of the samples after the shot peening treatment is decreased almost by 90%.From the above experimental results proper shot peening would improve not only the fatigue property but also the corrosion resistance of 2Cr13-typed stainless steel.

关键词： stainless steel shot peening fatigue limit corrosion resistance

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Enhancement on Fatigue Property of Aluminum Alloy Welded Joint by Utilizing Trailing peening

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Journal of Materials Science & Technology 2003年第Z1期19卷 198-201页

作者： Changli WANG Zhimin WAN Min ZHAO Jitai NIU Harbin Institute of Technology Harbin 150001 China Harbin Institute of Technology Harbin 150001 China Harbin Institute of Technology Harbin 150001 China Harbin Institute of Technology Harbin 150001 China

The fatigue properties of 2024T3 aluminum alloy welded joint treated by different peening methods were examined. The different effects on fatigue performance of high strength aluminum welded joints were compared with each other by carry out a series tests using two different peening treatment samples. Results show that by applying synchronized hammer peening to the weak part of joint when weld was going on, trailing peening, may refine the grains near weld line, hardening the surface of weld toe and amend the distribution of residual stress. Because of these results the position of fracture of joint was moved from weld toe to weld line. Compared to the joints treated by peening after welding, the fatigue strength of weld joint treated by trailing peening was enhanced by more than 102%.

关键词： Fatigue strength, Cycling, Residual stresses, Trailing peening

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The Surface Profile of Laser peening with Square Spots

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稀有金属材料与工程 2011年第S4期40卷 240-242页

作者： Zou S K1,2,Cao Z W1,Che Z G1,Li B21National Key Laboratory for Power Beam Processing Technologies,Beijing Aeronautical Manufacturing Technology Research Institute,Bei-jing 100024,China2Schoool of Mechanical of Science and Engineering,Huazhong University of Science and Technology,Wuhan 430074,China Beijing Aeronaut Mfg Technol Res Inst Natl Key Lab Power Beam Proc Technol Beijing 100024 Peoples R China Huazhong Univ Sci & Technol Sch Mech Sci & Engn Wuhan 430074 Peoples R China

The surface profile of laser peened stainless steel was researched in this paper,a special lens was used to convert circle laser spot to square spot,the difference of surface profile obtained by laser peening with circle laser spot was compared with that with square laser spot.Laser peened zone showed steep depression at the edge with square spot,but the surface in the shocked zone was very smooth.With suitable overlapped rate,square spot can produce smoother surface profile than circle spot,and laser peening with square spot is more effective than circle spot.

关键词： laser peening surface profile residual stress square spot

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Experimental Research on Laser Shot peening to Form Aluminum Alloy

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武汉理工大学学报 2006年第S3期28卷 837-840页

作者： ZHANG Xingquan ZHANG Yongkang GU Yongyu ZHOU Jianzhong YANG Chaojun School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,China, School of Mechanical Engineering Jiangsu UniversityZhenjiang 212013China

Laser shot peening forming is a novel technology,which employs residual stress induced by intense laser to shape precisely the plate.In this paper,the aeronautic aluminum alloy LY12CZ was selected as an object to research experimentally the magnitude of deformation versus numbers of laser shot peening,and surface quality in laser shot zone was also investigated.The specimen was impacted along its centerline by the high-power,short-duration pulses laser.The experimental results show that the arc height and hardness becomes greater with numbers of shot peening increasing and eventually arrives to saturated state,and sur- face roughness after laser shot peening decreases slightly and dislocation density increases greatly,which indicates that the laser shot peening is a technique combining laser shock processing and metal forming.

关键词： laser shot peening deformation hardness roughness microstructure

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