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high-cycle fatigue Fracture Behavior of Ultrahigh Strength Steels

Journal of Materials Science & Technology 2008年第5期24卷 787-792页

作者： Weijun HUI Yihong NIE Han DONG Yuqing WENG Chunxu WANG State Key Laboratory of Advanced Steel Processing and Products Beijing 100081 China National Engineering Research Center of Advanced Steel Technology Beiing 100081 China Yanshan University Qinhuangdao 066004 China The Chinese Society for Metals Beijing 100711 China

The fatigue fracture behavior of four ultrahigh strength steels with different melting processes and therefore different inclusion sizes were studied by using a rotating bar two-point bending fatigue machine in the high-cycle regime up to 107 cycles of loading. The fracture surfaces were observed by field emission scanning electron microscopy （FESEM）. It was found that the size of inclusion has significant effect on the fatigue behavior. For AtSI 4340 steel in which the inclusion size is smaller than 5.5 μm, all the fatigue cracks except one did not initiated from inclusion but from specimen surface and conventional S-N curve exists. For 65Si2MnWE and Aermet 100 steels in which the average inclusion sizes are 12.2 and 14.9 μm, respectively, fatigue cracks initiated from inclusions at lower stress amplitudes and stepwise S-N curves were observed. The S-N curve displays a continuous decline and fatigue failures originated from large oxide inclusion for 60Si2CrVA steel in which the average inclusion size is 44.4 pro. In the case of internal inclusion-induced fractures at cycles beyond about 1×10^6 for 65Si2MnWE and 60Si2CrVA steels, inclusion was always found inside the fish-eye and a granular bright facet （GBF） was observed in the vicinity around the inclusion. The GBF sizes increase with increasing the number of cycles to failure Nf in the long-life regime. The values of stress intensity factor range at crack initiation site for the GBF are almost constant with Nf, and are almost equal to that for the surface inclusion and the internal inclusion at cycles lower than about 1×10^6. Neither fish-eye nor GBF was observed for Aermet 100 steel in the present study.

关键词： high-cycle fatigue Ultrahigh strength steel Inclusion S-N curve Fish-eye fracture

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fatigue cracking criterion of high-strength steels induced by inclusions under high-cycle fatigue

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Journal of Materials Science & Technology 2023年第23期154卷 114-128页

作者： Peng Wang Peng Zhang Bin Wang Yankun Zhu Zikuan Xu Zhefeng Zhang Shi-changxu Innovation Center for Advanced Materials Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 China School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 China

fatigue properties of high-strength steels become more and more sensitive to inclusions with enhancing the ultimate tensile strength (UTS) because the inclusions often cause a relatively low fatigue strength and a large scatter of fatigue lives. In this work, four S–N curves and more than 200 fatigue fracture morphologies were comprehensively investigated with a special focus on the size and type of inclusions at the fatigue cracking origin in GCr15 steel with a wide strength range by different heat treatments after high-cycle fatigue (HCF). It is found that the percentage of fatigue failure induced by the inclusion including Al2 O3 and TiN gradually increases with increasing the UTS, while the percentage of failure at sample surfaces decreases conversely and the fatigue strength first increases and then decreases. Besides, it is interestingly noted that the inclusion sizes at the cracking origin for TiN are smaller than that for Al2 O3 because the stress concentration factor for TiN is larger than that for Al2 O3 based on the finite element simulation. For the first time, a new fatigue cracking criterion including the isometric inclusion size line in the strength-toughness coordinate system with specific physical meaning was established to reveal the relationship among the UTS, fracture toughness, and the critical inclusion size considering different types of inclusions based on the fracture mechanics. And the critical inclusion size of Al2 O3 is about 1.33 times of TiN. The fatigue cracking criterion could be used to judge whether fatigue fracture occurred at inclusions or not and provides a theoretical basis for controlling the scale of different inclusion types for high-strength steels. Our work may offer a new perspective on the critical inclusion size in terms of the inclusion types, which is of scientific interest and has great merit to industrial metallurgical control for anti-fatigue design.

关键词： high-strength steel high-cycle fatigue Critical inclusion size Inclusion types Tensile strength Fracture toughness fatigue cracking criterion

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Comparative study of tensile and high-cycle fatigue properties of extruded AZ91 and AZ91-0.3Ca-0.2Y alloys

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Journal of Materials Science & Technology 2021年第34期93卷 41-52页

作者： Ye Jin Kim Young Min Kim Seong-Gu Hong Dae Woong Kim Chong Soo Lee Sung Hyuk Park School of Materials Science and Engineering Kyungpook National UniversityDaegu 41566Republic of Korea Implementation Research Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea Division of Industrial Metrology Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Energy Infra Material Measure Team Korea Research Institute of Standards and ScienceDaejeon 34113Republic of Korea Graduate Institute of Ferrous Technology Pohang University of Science and Technology.Pohang 37673Republic of Korea

Mg-Al-Zn-Ca-Y alloys with excellent ignition and corrosion resistances—termed SEN alloys(where the letters"S,""E,"and"N"stand for stainless,environmentally friendly,and non-flammable,respectively)—have been developed *** this study,the microstructure,tensile properties,and high-cycle fatigue properties of an extruded Mg-9.0Al-0.8Zn-0.1Mn-0.3Ca-0.2Y(SEN9)alloy are investigated and compared with those of a commercial Mg-9.0Al-0.8Zn-0.1Mn(AZ91)alloy extruded under the same *** the extruded SEN9 alloy and the extruded AZ91 alloy have a fully recrystallized structure comprising equiaxed grains,but the former has a smaller average grain size owing to the promoted dynamic recrystallization during *** extruded AZ91 alloy contains coarse Mg_(17)Al_(12) discontinuous precipitate(DP)bands parallel to the extrusion direction,which are formed during its cool down after *** contrast,the extruded SEN9 alloy contains relatively fine undissolved Al_(2)Ca,Al_(8)Mn_(4)Y,and Al_(2)Y second-phase particles,which are formed during the solidification stage of the casting *** tensile strength of the extruded SEN9 alloy,which has finer grains and more abundant particles,is slightly higher than that of the extruded AZ91 ***,the difference in their strengths is relatively small because the stronger solid-solution hardening and precipitation hardening effects in the extruded AZ91alloy offset the stronger grain-boundary hardening and dispersion hardening effects in the extruded SEN9alloy to some *** tensile elongation of the extruded AZ91 alloy is significantly lower than that of the extruded SEN9 alloy because the large cracks formed in the DP bands in the former cause its premature *** the extruded SEN9 alloy has higher tensile properties than the extruded AZ91alloy,the high-cycle fatigue life and fatigue strength of the former are shorter and lower,respectively,than those of the *** DP bands in the extruded

关键词： Mg-Al-Zn-Ca-Y alloy Extrusion Tensile properties high-cycle fatigue Crack source

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high-cycle fatigue and fracture behaviours of SLM AlSi10Mg alloy

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Transactions of Nonferrous Metals Society of China 2020年第10期30卷 2577-2589页

作者： S.GLODEŽ J.KLEMENC F.ZUPANIČ M.VESENJAK Faculty of Mechanical Engineering University of MariborSmetanova 172000 MariborSlovenia Faculty of Mechanical Engineering University of LjubljanaAškerčeva 61000 LjubljanaSlovenia

The high-cycle fatigue and fracture behaviours of the selective laser melting(SLM)AlSi10Mg alloy were *** specimens were designed directly in the shape required for the fatigue tests under pulsating loading in tension(R=0,R is the dynamic factor).The fatigue−life(S−N)curves were modelled with a conditional Weibull’s probability density function,where the real-valued genetic algorithm(GA)and the differential ant-stigmergy algorithm(DASA)were applied to estimating the needed Weibull’s *** fractography of the fatigue specimens showed that the fatigue cracks initiated around the surface defects produced by SLM and then propagated in an unstable ***,the presence of large SLM defects mainly influenced the crack initiation period and did not have a strong influence on the crack *** obtained experimental results present a basis for further investigation of the fatigue behaviour of advanced materials and structures(*** metamaterials)fabricated by additive manufacturing(AM).Especially,in the case of two-dimensional cellular structures,the cross-section of cellular struts is usually rectangular which corresponds to the specimen shape considered in this work.

关键词： selective laser melting AlSi10Mg alloy high-cycle fatigue fracture behaviour

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high cycle fatigue Properties of Die-Cast Magnesium Alloy AZ91D with Addition of Different Concentrations of Cerium

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Journal of Rare Earths 2006年第5期24卷 591-595页

作者：杨友刘勇兵秦淑影方懿 Key Laboratory of Automobile Materials Ministry of Education Jilin University

The effect of addition of different concentrations of Ce on high-cycle fatigue behavior of die-cast magnesium alloy AZ91D was investigated. Mechanical fatigue tests were conducted at the stress ratio of R = 0.1, and fatigue strength was evaluated using up-and-down loading method. The results show that the grain size of AZ91D alloy is remarkably refined, and the amount of porosity decreases and evenly distributes with the addition of Ce. The fatigue strength of AZ91D alloy at room temperature increases from 96.7 up to 116.3 MPa （ 1% Ce） and 105.5 MPa （2 % Ce）, respectively, at the number of cycles to failure, Nf = 1 × 10^7. The fatigue crack of AZ91D alloy initiates at porosities and inclusions, and propagates along grain boundaries. The fatigue striations on fractured surface appear with Ce addition. The fatigue fracture surface of test specimens shows mixed-fracture characteristics of quasi-cleavage and dimple.

关键词： die-cast magnesium alloy cerium high-cycle fatigue fracture surface analysis rare earths

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A New Kind of Reliability Analysis Method in Coupled Case of high-cycle fatigue and Low-cycle fatigue

A New Kind of Reliability Analysis Method in Coupled Case of...

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2012年质量，可靠性，风险，维修性及安全性工程国际学术会议

作者： Xinjie Shao,Lijun Cao,Jinhua Liu,Guangsheng Liu,Guibo Yu,Guang Tian Shijiazhuang Mechanical Engineering College Shijiazhuang,Hebei,China

To overcome the limitation of traditional reliability analysis methods in coupled cases of high-cycle fatigue and low-cycle fatigue and accurately analyze the stochastic fatigue reliability of component,a new kind of method decoupling method for high-cycle fatigue and low-cycle fatigue is firstly put *** stress and strain spectrums are corrected and *** for high-cycle fatigue,probability fatigue accumulation damage theory and nominal stress method are *** for low-cycle fatigue,random response surface method is adopted to fit the life distribution function,probability fatigue accumulation damage theory and local stress and strain method are combined to obtain the high-cycle and low-cycle stochastic fatigue *** damage of high-cycle and low-cycle is analyzed based on probability fatigue accumulation damage theory to achieve the stochastic fatigue reliability of torsion shaft of complicated equipment.

关键词： reliability analysis high-cycle fatigue low-cycle fatigue torsion shaft fatigue life

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Multivariate relationships between microstructure evolution and strengthening mechanisms in laser powder bed fusion of Al-Mn-Sc alloy:towards improved fatigue performance

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Light(Advanced Manufacturing) 2024年第1期5卷 3-18页

作者： Huaping Tang Chaofeng Gao Shiheng Zhang Xiaojing Xiong Sheng Cao Xiaopeng Wu Yunjie Bi Jeremy Heng Rao Institute of Advanced Additive Manufacturing Ji Hua LaboratoryFoshanGuangdong528200China Department of Mechanical Engineering College of EngineeringShantou UniversityShantouGuangdong515063China School of Materials Science and Engineering Northeastern UniversityShenyang 110819China

The effects of direct aging treatment(at 300°C for 5 hours)on selective laser melted(SLMed)Al-4.5Mn-1.5Mg-0.9Sc-0.2Zr alloy were investigated in this work,with the microstructure,fatigue behaviors,and fracture characteristics examined to determine the primary cause of fatigue crack *** results revealed that the microstructure of the investigated alloy comprised fine equiaxed and columnar *** aging treatment,a significant number of nano-scaled Al3(Sc,Zr)precipitates were dispersed within the grains,leading to a substantial increase in *** yield strength improved from 431 MPa to 568 MPa,representing an increase of more than 32%,while the fatigue strength improved from 180 MPa to 220 MPa after aging ***,the fracture toughness decreased significantly from 25.1 MPa·√m to 12.3 MPa·√*** results of the fatigue fracture characteristics indicate that the Mn-rich phase and the formation of defects such as pores and poor powder fusion are the sources of fatigue *** direct aging treatment can significantly increase the yield strength,decrease the rate of fatigue crack propagation,and thus improve the fatigue performance,it deteriorates the fracture toughness,and thus shortens the fatigue life of the alloy as well.

关键词： Selective laser melting Al-Mn-Sc alloys high-cycle fatigue

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Review on fatigue life prediction models of welded joint

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Acta Mechanica Sinica 2020年第3期36卷 701-726页

作者： Guozheng Kang Huiliang Luo Applied Mechanics and Structure Safety Key Laboratory of Sichuan Province School of Mechanics and EngineeringSouthwest Jiaotong UniversityChengdu 610031China Institute of Applied Mechanics State Key Laboratory of Traction PowerSouthwest Jiaotong UniversityChengdu 610031China

fatigue assessment of welded joint is still far from being completely solved now,since many influencing factors coexist and some important ones should be considered in the developed life prediction models ***,such influencing factors of welded joint fatigue are firstly summarized in this work;and then,the existing life prediction models are reviewed from two aspects,i.e.,uniaxial and multiaxial ones;finally,significant conclusions of existing experimental and theoretical researches and some suggestions on improving the fatigue assessment of welded joints,especially for the low-cycle fatigue with the occurrence of ratchetting,are provided.

关键词： Welded joint high-cycle fatigue Low-cycle fatigue Influencing factors Life prediction models

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Effect of cold deformation on corrosion fatigue behavior of nickel-free high nitrogen austenitic stainless steel for coronary stent application

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Journal of Materials Science & Technology 2018年第4期34卷 660-665页

作者： Jun Li Yixun Yang Yibin Ren Jiahui Dong Ke Yang Institute of Metal Research Chinese Academy of Sciences School of Materials Science and Engineering University of Science and Technology of China

Due to the excellent mechanical properties, good corrosion resistance, high biocompatibility and nickel- free character, the high nitrogen nickel-free austenitic stainless steel （HNASS） becomes an ideally alternative material for coronary stents. Stent implantation works in harsh blood environment after a balloon dilatation, i.e., the material is used in a corrosive environment with a permanent deforma- tion. The present study attempts to investigate effects of pre-straining on high-cycle fatigue behavior and corrosion fatigue behavior of HNASS in Hank＇s solution and the relevant mechanism for coronary stents application. It is found that higher pre-straining on HNASS results in higher strength and maintains almost same corrosion resistance. fatigue limit of 0% HNASS is 550 MPa, while corrosion fatigue limit is 475 MPa. And improvement in fatigue limit of 20% and 35% pre-strained HNASS is in comparison with the 0% HNASS, while corrosion would undermine the fatigue behavior of HNASS. In a suitable range, the pre- straining had a beneficial effect on corrosion fatigue strength of HNASS, such as nearly 300 MPa improved with 20% cold deformation. This result provides a good reference for predicting the life of HNASS stent and as well its design.

关键词： Cold deformation high nitrogen austenitic stainless steel high-cycle fatigue Corrosion fatigue

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Prediction of combined cycle fatigue life of TC11 alloy based on modified nonlinear cumulative damage model

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Chinese Journal of Aeronautics 2021年第7期34卷 73-84页

作者： Zhenhua ZHAO Kainan LU Lingfeng WANG Lulu LIU Wei CHEN State Key Laboratory of Mechanics and Control of Mechanical Structures Nanjinj University of Aeronautics and AstronauticsNanjing 210016China Aero-engine Thermal Environment and Structure Key Laboratory of Ministry of Industry and Information Technology College of Energy and Power EngineeringNanjing University of Aeronautics and AstronauticsNanjing 210016China

The nonlinear cumulative damage model is modified to have high prediction accuracy when the high-low cycle stress frequency ratio m is large(m500).The low cycle fatigue(LCF)tests,high cycle fatigue(HCF)tests and combined high and low cycle fatigue(CCF)tests of TC11 titanium alloy were carried out,and the influencing factors of CCF life were *** CCF life declines with the decrease of the ratio of high-low cycle stress frequency *** linear and nonlinear cumulative damage models are used to predict the CCF *** CCF life prediction error of the linear cumulative damage model is great and the predictions tend to be overestimated,which is dangerous for engineering *** accuracy is relatively high when the high-low cycle stress frequency ratio m*** accuracy of nonlinear cumulative damage model is higher than that of linear model when the high-low cycle stress frequency ratio m*** on the relationship between high cycle average stress rmajor and material yield limit rp,0.2,a correction term is added to the nonlinear cumulative damage model and verified,which made the modified model more accurate when m500.

关键词： Combined cycle Damage accumulation high-cycle fatigue Low-cycle fatigue Prediction method

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