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Journal of Magnesium and Alloys 2023年第5期11卷 1592-1607页

作者： Hitoshi Soyama Chieko Kuji Yiliang Liao Department of Finemechanics Tohoku University6-6-01 AobaAramakiAoba-kuSendai 980-8579Japan Department of Industrial and Manufacturing Systems Engineering Iowa State University2529 Union Dr.AmesIA 50011United States of America

To investigate the improvement in the fatigue strength of magnesium alloy by peening methods,magnesium alloy AZ31 was treated by submerged laser peening(SLP),cavitation peening(CP),and shot peening(SP),and the fatigue properties were evaluated by a plane bending fatigue test.In the case of SLP,both the impact induced by laser ablation(LA)and that caused by laser cavitation(LC),which developed after LA,were used.In the present study,the fatigue life at a constant bending stress was examined to determine the suitable coverage.It was found that the fatigue strengths at N=10^(7)for the SLP,CP,and SP specimens treated by each optimum condition were 56%,18%,and 16%higher,respectively,than that of the non-peened(NP)specimen,which was 97 MPa.The key factors in the improvement of fatigue strength by peening methods were work hardening and the introduction of compressive residual stress.

关键词： Magnesium alloy Fatigue strength Laser peening Cavitation peening shot peening

Fatigue Properties Improvement of Low-Carbon Alloy Axle Steel by Induction Hardening and shot peening:A Prospective Comparison

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Acta Metallurgica Sinica(English Letters) 2022年第8期35卷 1343-1356页

作者： G.C.Chu F.Z.Hu X.J.jin Y.Zhang Q.Wang J.P.Hou Z.F.Zhang Shi-Changxu Innovation Center for Advanced Material Institute of Metal ResearchChinese Academy of SciencesShenyang 110016.China School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230026China Manshan Iron and Steel Co. Ltd.Maanshan 243000China School of Materials Science and Engineering Shanghai Jiao Tong UniversityShanghai 200240China Baowu Group Masteel Rail Transit Materials Technology Company Limited Maanshan 243000China

Fatigue fracture is the major threat to the railway axle, which can be avoided or delayed by surface strengthening. In this study, a low-carbon alloy axle steel with two states was treated by surface induction hardening and shot peening, respectively, to reveal the mechanism of fatigue property improvement by microstructure characterization, microhardness measurement, residual stress analysis, roughness measurement, and rotary bending fatigue tests. The results indicate that both quenching and tempering treatment can effectively improve the fatigue properties of the modified axle steel. In addition, induction hardening can create an ideal hardened layer on the sample surface by phase transformation from the microstructure of ferrite and pearlite to martensite. By comparison, shot peening can modify the microstructure in surface layer by surface severe plastic deformation introducing a large number of dislocation and even cause grain refinement. Both induction hardening and shot peening create compressive residual stress into the surface layer of axle steel sample, which can effectively reduce the stress level applied to the metal surface during the rotary bending fatigue tests. On the whole, the contribution of induction hardening to the fatigue life of axle steel sample is better than that of the shot peening, and induction hardening shows obvious advantages in improving the fatigue life of axle steel.

关键词： Surface strengthening Induction hardening shot peening Axle steel Fatigue property improvement

Effect of shot peening on Surface Damage Evolution Behavior of Cu-19Ni Alloy

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Journal of Wuhan University of Technology(Materials Science) 2023年第1期38卷 212-221页

作者：朱旭军李磊 SHI Zhiming WEI Liangyu TIAN Fuzheng College of Sciences Inner Mongolia University of TechnologyHohhot 010051China School of Materials Science and Engineering Inner Mongolia University of TechnologyHohhot 010051China

shot peening is a surface modification technology with the metal surface nano machine(SNC),which can modify the surface microstructure and extend the fatigue life of Cu-19Ni alloy.The hardness,damage evolution and mechanical properties were investigated and characterized by scanning electron microscope(SEM),laser confocal microscope(LSM)and material surface performance tester(CFT).The results showed that the surface roughness and friction coefficient of Cu-19Ni alloy decreased with the increase of shot peening duration and diameter,while the microhardness and strength increased.Moreover,with the increase in shot peening duration and diameter,SEM observation showed that the fracture dimples became smaller,meanwhile,with the increase of small cleavage planes,shear tearing ridges and the thickness of the surface nano layer,the fracture mode gradually evolved from plastic to brittle fracture.The uniaxial tensile test of shot peened Cu-19Ni alloy was carried out by MTS testing machine combined with digital image correlation technology(DIC).The evolution of Cu-19Ni surface damage was analyzed,and the evolution equations describing the damage of large deformation zone and small deformation zone were established.The effect of shot peening on the damage evolution behavior of Cu-19Ni alloy was revealed.

关键词： Cu-19Ni alloy shot peening damage evolution mechanical properties digital image correlation

Numerical Calculation and Experimental Research on Residual Stresses in Precipitation-hardening Layer of NAK80 Steel for shot peening

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Chinese Journal of Mechanical Engineering 2011年第3期24卷 439-445页

作者： MIAO Hong ZUO Dunwen WANG Min ZHANG Ruihong WANG Hongfeng Jiangsu Key Laboratory of Precision and Micro-Manufacturing Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China College of Mechanical Engineering Yangzhou University Yangzhou 225000 China

shot peening can improve fatigue strength of materials by creating compressive residual stress field in their surface layers,and offers a protection against crack initiation and propagation,corrosion,etc.And fatigue fracture and stress corrosion cracking of NAK80 steel parts are improved effectively.Currently there lacks in-depth research in which the beneficial effect of the residual stress may be offset by the surface damage associated with shot peening,especially in terms of the research on the effective control of shot peening intensity.In order to obtain the surface residual stress field of NAK80 steel after shot peening,the samples are shot peened by pneumatic shot peening machine with different rules.The residual stress in the precipitation-hardening layer of NAK80 steel is measured before and after a shot peening treatment by X-ray diffraction method.In order to obtain true residual stress field,integral compensation method is used to correct results.By setting up analytical model of the residual stress in the process of shot peening,the surface residual stress is calculated after shot peening,and mentioning the reason of errors occurred between calculated and experimental residual stresses,which is mainly caused by the measurement error of the shoot arc height.At the same time,micro hardness,microstructure and roughness in the precipitation-hardening layer of NAK80 steel before and after shot peening were measured and surveyed in order to obtain the relation between shot peening strength and surface quality in the precipitation-hardening layer.The results show that the surface quality of NAK80 steel is significantly improved by shot peening process.The over peening effect is produced when the shot peening intensity is too high,it is disadvantageous to improve sample＇s surface integrity,and leading to reduce the fatigue life.When arc high value of optimal shot peening is 0.40 mm,the surface quality is the best,and the depth of residual stress in the precipitation-hardening layer reaches to about 450 μm.Nu

关键词： shot peening residual stress precipitation-hardening layer surface quality

Predictions of decreased surface roughness after shot peening using controlled media dimensions

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Journal of Materials Science & Technology 2020年第23期58卷 120-129页

作者： Siavash Ghanbari David F.Bahr School of Materials Engineering Purdue UniversityWest LafayetteIN47907USA

shot peening induces residual compressive stresses on metallic substrates, often used to decrease fatigue crack growth. The relationship between surface roughness and the magnitude of the stress can be affected by peening media size or the extent of peening. Generally, an ideal condition from shot peening would be a high compressive residual stress and a low surface roughness, but these tend to be inversely related.This study proposes a method for decreasing roughness and increasing residual stress concurrently using a distribution of shot sizes in a single shot peening passage based on finite element modeling that has been calibrated using by experimental results. Numerical models predict mixed shot sizes will create a smoother surface than using monodispersed shot at 100 % coverage. The residual stress profile for mixed shot sizes showed a broad range of compressive residual stresses in comparison with the largest impact ball size. This newly proposed method can improve the surface quality and the extent of the compressive residual stresses in a single-shot peening passage.

关键词： Numerical analysis shot peening Roughness

Effects of shot peening Process on Thermal Cycling Lifetime of TBCs Prepared by EB-PVD

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Chinese Journal of Aeronautics 2007年第2期20卷 145-147页

作者： ZHOU Zhao-hui GONG Sheng-kai LI He-fei XU Hui-bin ZHANG Chun-gang WANG Lu School of Materials Science and Engineering Beij＇ing University of Aeronautics and Astronautics Beij＇ing 100083 China Shenyang Liming.4ero-Engine Group Corporation Shenyang 110043 China

Conventional two-layered thermal barrier coatings （TBCs） are prepared by electron beam physical vapor deposition （EB-PVD） with ZrO2-8 wt% Y2O3 （8YSZ） as top coat and CoCrAlY as bond coat on disk-shaped Ni based super-alloy. In this paper, three kinds of shot peening process with different lengths of operating time were adopted for bond coating. As a result, changes took place in its surface roughness and the surface micro-hardness. A thermal cycling test at 1 273 Kx55 rain and another at room temperature for 5 min were performed to study the effects of shot peening process on the thermal cycling lifetime of TBCs. It is found that a moderate shot peening process will be able to prolong the life time. The oxidation dynamic of the as-processed TBCs basically accords with the parabolic rule, and the oxidation test also attests to the spallation between YSZ and thermal growth oxide （TGO） responsible mainly for the failure of TBCs.

关键词： thermal cycling lifetime shot peening thermal barrier coatings （TBCs）

Effect of Varying Carbon Content and shot peening upon Fatigue Performance of Prealloyed Sintered Steels

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Journal of Materials Science & Technology 2009年第5期25卷 607-610页

作者： R.Bidulsky M.Actis-Grande M.Kabtov J.Bidulsk Politecnico Torino Alessandria CampusV.T.Michel5Alessandria 15000Italy Institute of Materials Research SASWatsonova 47Koice04011Slovakia Technical University of Koice Faculty of MetallurgyLetn9Koice 04200Slovakia

The aim of the work was to find out how the modification of surface treatment and microstructures affect the fatigue characteristics of the considered sintered materials. Two different systems were prepared： as-sintered and shot peened prealloyed sintered （Astaloy CrL based） steels with addition of 0.5% and 0.7% C. Sintering was carried out in laboratory tube furnace in an atmosphere of pure gases 75%N2＋25%H2. The sintering temperature was 1180℃ and sintering time was 60 min. Heating and cooling rates were 10℃/min. Fatigue tests were carried out in symmetric plane bending at stress ratio R=-1 with frequency of about 24 Hz. The presented experimental results showed that prealloyed water-atomised steels, with surface modification, exhibit positive effects on the fatigue failure resistance, and for that reason are suitable for high-performance applications.

关键词： Sintered steels shot peening Fatigue strength S-N curves

Fretting Fatigue Improvement of Ti6Al4V by Coating and shot peening

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Journal of Materials Science & Technology 2005年第2期21卷 246-250页

作者： DaoxinLIU XiaodongZHU BinTANG JiawenHE NorthwesternPolytechnicalUniversity Xi'an710072China Xi'anJiaotongUniversity Xi’an710049China TaiyuanUniversityofTechnology Taiyuan030024China

Ion beam enhanced deposition (IBED) was employed to increase the fretting fatigue resistance of Ti6AI4V. CrN and TiN hard coatings were applied on the base material and shot peening was combined with the hard coatings to study the duplex effect on fretting fatigue resistance. The IBED coatings exhibited a good bonding strength. They did not spall off even after shot peening. However, an optimum composition of CrN showed better fretting fatigue resistance than that of TiN with the same processing parameters.

关键词： Fretting fatigue Ti-alloy shot peening Coatings

A Numerical Study Comparing the Effect on Residual Stresses of Two Different Types of Projectiles During shot peening

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Computers, Materials & Continua 2016年第3期51卷 203-215页

作者： J.Solórzano-López F.A.García-Pastor Angélica Flores-Luna UNAM Facultad de QuímicaCiudad de MéxicoMéxico Cinvestav Unidad Saltillo CoahuilaMéxico TecNM Instituto Tecnológico de Tláhuac IIICiudad de MéxicoMéxico

shot peening is a widely used technique to improve fatigue life in metallic alloys.This processing technique introduces a subsurface compressive residual stress field through a plastic deformation of the surface caused by the impact of a large number of high-speed projectiles.There are a number of parameters that affect the residual stress field depth and magnitude.The effects of the impact angle,shot speed and shot geometry are currently being researched.In particular,substituting spherical cast shots by cylindrical cut wire shots is an attractive option,especially in terms of cost.The effect of shot geometry on residual stresses,however,needs to be further investigated.Because industrial-scale experimentation is costly and cumbersome,mathematical modeling offers a convenient alternative to carry out this type of research.The present work shows a comparison between the residual stresses generated by the impact of spherical and cylindrical projectiles on a steel substrate.This threedimensional model was developed using ABAQUS finite element commercial software(Release 6.12,Dassault Systémes,France).The results show that cylindrical shots generate residual stress fields t hat a re higher in magnitude than t hose generated by a spherical shot.However,the residual stress field of cylindrical shots impacting the surface at an oblique angle shows an important degree of asymmetry.This effect is not found when spherical shots impact the surface at the same oblique angle.

关键词： shot peening Finite element method Residual Stresses

Water and shot peening of Aluminum 7020

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材料科学与工程（中英文A版） 2022年第3期12卷 73-80页

作者： Armirmohammad Jamali Eckehard Mueller Bochum University of Applied Science Bochum 44801Germany Steinbeis-Transfer Center for Spring Technology Component Behavior and ProcessLangerfeldstr.53cIserlohn 58638Germany

Water jet peening is a young technology compared to the traditional shot peening.It is a suitable method to induce compressive residual stresses in surface layers of materials with low tensile strength.The roughness is relatively low.In this study,water jet peening and shot peening is compared concerning induced compressive residual stresses and roughness at Aluminum 7020.These two parameters influence essentially the durability of a component.

关键词： Waterjet peening shot peening residual stresses aluminum 7020