International Journal of Fatigue最新文献

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Study on shear fatigue damage behavior and evolution of Fe-Pb thin walled heterogeneous welded material components under hot isostatic pressure

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-07 DOI: 10.1016/j.ijfatigue.2025.108867

Siyuan Ding , Jianhua Liu , Jinfang Peng , Hechang Li , Bo Li , Minhao Zhu

For the first time, 45 steel and Pb were welded to form Fe-Pb thin-walled heterogeneous welding material components, which can be used in heavy-duty and radiation resistant environments. This study conducted comparative shear fatigue tests under different alternating loads under the conditions of hot isostatic pressing (HIP) control technology. The experimental results are as follows: after HIP treatment, there was a significant preference for grain orientation and an increase in grain size in the specimen. At the same time, the fatigue failure mechanism of Fe-Pb thin-walled heterogeneous components changed from brittle of cleavage fracture to quasi cleavage fracture of ductile–brittle mixture. Meanwhile, the cracking mechanism of Fe-Pb thin-walled heterogeneous Welded material components under without HIP and HIP conditions has been revealed. A mapping relationship failure model was established for grain size, grain orientation and distribution, dislocation configuration evolution, and fatigue life. The research results provide effective theoretical support for the fatigue damage behavior of Fe-Pb thin-walled heterogeneous welded material components.

{"title":"Study on shear fatigue damage behavior and evolution of Fe-Pb thin walled heterogeneous welded material components under hot isostatic pressure","authors":"Siyuan Ding , Jianhua Liu , Jinfang Peng , Hechang Li , Bo Li , Minhao Zhu","doi":"10.1016/j.ijfatigue.2025.108867","DOIUrl":"10.1016/j.ijfatigue.2025.108867","url":null,"abstract":"<div><div>For the first time, 45 steel and Pb were welded to form Fe-Pb thin-walled heterogeneous welding material components, which can be used in heavy-duty and radiation resistant environments. This study conducted comparative shear fatigue tests under different alternating loads under the conditions of hot isostatic pressing (HIP) control technology. The experimental results are as follows: after HIP treatment, there was a significant preference for grain orientation and an increase in grain size in the specimen. At the same time, the fatigue failure mechanism of Fe-Pb thin-walled heterogeneous components changed from brittle of cleavage fracture to quasi cleavage fracture of ductile–brittle mixture. Meanwhile, the cracking mechanism of Fe-Pb thin-walled heterogeneous Welded material components under without HIP and HIP conditions has been revealed. A mapping relationship failure model was established for grain size, grain orientation and distribution, dislocation configuration evolution, and fatigue life. The research results provide effective theoretical support for the fatigue damage behavior of Fe-Pb thin-walled heterogeneous welded material components.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108867"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143372092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Dwell-fatigue behaviour of additively manufactured Ti6242 alloy via LPBF and HIPPING

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-07 DOI: 10.1016/j.ijfatigue.2025.108864

Atasi Ghosh , Saem Ahmed , Sureddy Tejanath Reddy , Gyan Shankar

Ambient-temperature, low-cycle dwell fatigue, conventional low-cycle fatigue and creep tests have been performed on additively manufactured and Hot Isostatic Pressed (HIPPED) Ti-6Al-2Sn-4Zr-2Mo alloy. The low-cycle dwell fatigue life compared with the low-cycle fatigue life showed a dwell debit of 5. The factor decrease in the low-cycle dwell fatigue life from the low-cycle fatigue life remain almost same with decreasing peak stress for 120 s dwell time. Key findings indicate that the Laser Powder Bed Fusion process induces an inherent anisotropy and heterogeneity in the microstructure, which, while mitigated by HIPPING, still influences fatigue resistance under dwell loading. The combination of refined microstructure and residual stress relief from HIPPING resulted in improved dwell fatigue performance, though certain microstructural features, such as columnar grains in the as-built condition, contributed to premature crack initiation sites under cyclic loading. The simulated dwell fatigue behaviour based on the Andrade model indicates there is a three-fold increase in the Andrade coefficient with respect to the creep behaviour. The appreciably high dwell sensitivity has been attributed to higher strain rate sensitivity and low strain hardening coefficient which causes significant cyclic softening of the microstructure generated via LPBF + HIPPING of Ti-6242 alloy.

{"title":"Dwell-fatigue behaviour of additively manufactured Ti6242 alloy via LPBF and HIPPING","authors":"Atasi Ghosh , Saem Ahmed , Sureddy Tejanath Reddy , Gyan Shankar","doi":"10.1016/j.ijfatigue.2025.108864","DOIUrl":"10.1016/j.ijfatigue.2025.108864","url":null,"abstract":"<div><div>Ambient-temperature, low-cycle dwellfatigue, conventional low-cycle fatigueand creeptests have beenperformed on additively manufactured and Hot Isostatic Pressed (HIPPED) Ti-6Al-2Sn-4Zr-2Moalloy.The low-cycle dwellfatigue life comparedwith the low-cycle fatiguelife showed a dwell debit of 5. The factor decrease in thelow-cycle dwellfatiguelifefrom the low-cycle fatiguelife remain almost same withdecreasing peak stress for 120 s dwell time. Key findings indicate that the Laser Powder Bed Fusion process induces an inherent anisotropy and heterogeneity in the microstructure, which, while mitigated by HIPPING, still influences fatigue resistance under dwell loading.The combination of refined microstructure and residual stress relief from HIPPING resulted in improved dwell fatigue performance, though certain microstructural features, such as columnar grains in the as-built condition, contributed to premature crack initiation sites under cyclic loading.The simulated dwell fatigue behaviour based on the Andrade model indicates there is a three-fold increase in the Andrade coefficient with respect to the creep behaviour. The appreciably high dwell sensitivity has been attributed to higher strain rate sensitivity and low strain hardening coefficient which causes significant cyclic softening of the microstructure generated via LPBF + HIPPING of Ti-6242 alloy.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108864"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143378852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Cyclic deformation behavior of medium-manganese transformation-induced plasticity steel at elevated temperatures: Mechanical tests and microstructural characterization

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-07 DOI: 10.1016/j.ijfatigue.2025.108866

Juan Zhang , Zhicheng Song , Zongxi Wu , Xingmin Huang , Qianhua Kan

Medium-manganese transformation-induced plasticity (TRIP) steel, a new generation advanced high-strength steel, exhibits a combination of excellent strength and plasticity. Due to the TRIP effect, the cyclic deformation behavior and mechanisms of the steel are more complicated, especially at elevated temperatures. In this work, the monotonic and cyclic deformation of Fe-0.4C-7Mn-3.2Al steel were investigated at elevated temperatures, based on the previous experiments at room temperature. The influence of temperature on cyclic deformation characteristics and mechanisms were revealed by mechanical tests and multi-scale microstructural characterization. At 200 °C, the material exhibited cyclic stability under symmetric strain-controlled loading. Under asymmetric stress-controlled loading, it behaved steady ratchetting evolution under lower and medium stress amplitudes and significantly accelerated ratchetting evolution under higher stress amplitudes. The deformation mechanism at room temperature and 200 °C involved the coordination of dislocation slip and phase transformation. At 300 °C, the cyclic deformation characteristics of the material differed significantly from that at 200 °C. The cyclic hardening was observed under symmetric strain-controlled loading. Under asymmetric stress-controlled loading, the ratchetting strain rapidly got into shakedown after a few cycles under various stress amplitudes. The deformation mechanism at 300 °C was dominated by dislocation slip under dynamic strain aging.

{"title":"Cyclic deformation behavior of medium-manganese transformation-induced plasticity steel at elevated temperatures: Mechanical tests and microstructural characterization","authors":"Juan Zhang , Zhicheng Song , Zongxi Wu , Xingmin Huang , Qianhua Kan","doi":"10.1016/j.ijfatigue.2025.108866","DOIUrl":"10.1016/j.ijfatigue.2025.108866","url":null,"abstract":"<div><div>Medium-manganese transformation-induced plasticity (TRIP) steel, a new generation advanced high-strength steel, exhibits a combination of excellent strength and plasticity. Due to the TRIP effect, the cyclic deformation behavior and mechanisms of the steel are more complicated, especially at elevated temperatures. In this work, the monotonic and cyclic deformation of Fe-0.4C-7Mn-3.2Al steel were investigated at elevated temperatures, based on the previous experiments at room temperature. The influence of temperature on cyclic deformation characteristics and mechanisms were revealed by mechanical tests and multi-scale microstructural characterization. At 200 °C, the material exhibited cyclic stability under symmetric strain-controlled loading. Under asymmetric stress-controlled loading, it behaved steady ratchetting evolution under lower and medium stress amplitudes and significantly accelerated ratchetting evolution under higher stress amplitudes. The deformation mechanism at room temperature and 200 °C involved the coordination of dislocation slip and phase transformation. At 300 °C, the cyclic deformation characteristics of the material differed significantly from that at 200 °C. The cyclic hardening was observed under symmetric strain-controlled loading. Under asymmetric stress-controlled loading, the ratchetting strain rapidly got into shakedown after a few cycles under various stress amplitudes. The deformation mechanism at 300 °C was dominated by dislocation slip under dynamic strain aging.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108866"},"PeriodicalIF":5.7,"publicationDate":"2025-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143454472","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

The coupling effects of oxidation and temperature on the low cycle fatigue deformation behavior of CM 247 DS LC alloy

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-06 DOI: 10.1016/j.ijfatigue.2025.108858

S. Chandra , N. Paulose , R.K. Rai

The role of environmental degradation, particularly oxidation, on the low cycle fatigue response of rotating blades of aero-engine operating at significantly high temperatures is extremely important as it adversely affects its performance. The present work investigates the coupling effect of prior cyclic oxidation and temperature on the low cycle fatigue (LCF) fatigue behaviour of CM 247 DS LC Ni-based superalloy. The LCF tests were performed on both as-received and pre-oxidized specimens at design significant temperatures, i.e., 750 and 850 °C at a strain ratio of 0. The oxidation damage was induced by pre-cyclic thermal exposures at 850 °C for 500 h. The prior oxidized test specimens tended to have lower fatigue lives compared to the as-received test pieces. The nickel oxide, alumina, chromia scales, and alumina-rich intrusions formed during prior oxidation are vulnerable to cracking under low-cycle fatigue (LCF) loading, leading to rapid crack initiation and a corresponding reduction in LCF life. The deterioration of fatigue performance of the prior-oxidized samples is attributed to the formation of a weaker precipitate free zones zone, which effectively introduce the strain incompatibility and cracking the oxide scales.

{"title":"The coupling effects of oxidation and temperature on the low cycle fatigue deformation behavior of CM 247 DS LC alloy","authors":"S. Chandra , N. Paulose , R.K. Rai","doi":"10.1016/j.ijfatigue.2025.108858","DOIUrl":"10.1016/j.ijfatigue.2025.108858","url":null,"abstract":"<div><div>The role of environmental degradation, particularly oxidation, on the low cycle fatigue response of rotating blades of aero-engine operating at significantly high temperatures is extremely important as it adversely affects its performance. The present work investigates the coupling effect of prior cyclic oxidation and temperature on the low cycle fatigue (LCF) fatigue behaviour of CM 247 DS LC Ni-based superalloy. The LCF tests were performed on both as-received and pre-oxidized specimens at design significant temperatures, i.e., 750 and 850 °C at a strain ratio of 0. The oxidation damage was induced by pre-cyclic thermal exposures at 850 °C for 500 h. The prior oxidized test specimens tended to have lower fatigue lives compared to the as-received test pieces. The nickel oxide, alumina, chromia scales, and alumina-rich intrusions formed during prior oxidation are vulnerable to cracking under low-cycle fatigue (LCF) loading, leading to rapid crack initiation and a corresponding reduction in LCF life. The deterioration of fatigue performance of the prior-oxidized samples is attributed to the formation of a weaker precipitate free zones zone, which effectively introduce the strain incompatibility and cracking the oxide scales.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108858"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376691","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Microstructural origins of cycle hardening behaviors and fracture mechanisms of 304L stainless steel during low-cycle fatigue

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-06 DOI: 10.1016/j.ijfatigue.2025.108859

Wei Jiang , Shaojia Shi , Heng Wang , Kang Wei , Yonghao Zhao

Low-cycle fatigue behaviors of 304L stainless steel were investigated under different strain amplitudes (0.25 %, 0.3 %, 0.4 %, 0.5 %) and number of cycles to establish the relationship between macro-properties and micro-mechanisms. In all cases of strain amplitude, the 304L stainless steel displays a slight degree of cycle softening subsequent to the initial hardening in the cyclic stress–strain response. In the final stages of fatigue, the 304L stainless steel once again exhibits intense cycle hardening, contingent on the strain amplitude. In the two internal stress components of flow stress, the back stresses consistently exceed the effective stresses at varying strain amplitudes, demonstrating that the long-range resistance stresses for dislocation slip are larger than the short-range obstacles. Detailed microstructural investigation reveals that dislocations and stacking faults are the predominant microstructures observed at a low strain amplitude of 0.25 %. A phase transformation from FCC to HCP leads to cycle hardening at 0.3 % strain amplitude. At 0.4 % strain amplitude and above, the formation of dislocation substructures (veins, walls and cells) and BCC structural

α^{,}

−martensite results in a more pronounced hardening effect, albeit at the cost of premature fracture. The present study offers a fundamental insight into the deformation mechanisms of 304L stainless steel during cyclic loading.

{"title":"Microstructural origins of cycle hardening behaviors and fracture mechanisms of 304L stainless steel during low-cycle fatigue","authors":"Wei Jiang , Shaojia Shi , Heng Wang , Kang Wei , Yonghao Zhao","doi":"10.1016/j.ijfatigue.2025.108859","DOIUrl":"10.1016/j.ijfatigue.2025.108859","url":null,"abstract":"<div><div>Low-cycle fatigue behaviors of 304L stainless steel were investigated under different strain amplitudes (0.25 %, 0.3 %, 0.4 %, 0.5 %) and number of cycles to establish the relationship between macro-properties and micro-mechanisms. In all cases of strain amplitude, the 304L stainless steel displays a slight degree of cycle softening subsequent to the initial hardening in the cyclic stress–strain response. In the final stages of fatigue, the 304L stainless steel once again exhibits intense cycle hardening, contingent on the strain amplitude. In the two internal stress components of flow stress, the back stresses consistently exceed the effective stresses at varying strain amplitudes, demonstrating that the long-range resistance stresses for dislocation slip are larger than the short-range obstacles. Detailed microstructural investigation reveals that dislocations and stacking faults are the predominant microstructures observed at a low strain amplitude of 0.25 %. A phase transformation from FCC to HCP leads to cycle hardening at 0.3 % strain amplitude. At 0.4 % strain amplitude and above, the formation of dislocation substructures (veins, walls and cells) and BCC structural <span><math><msup><mrow><mi>α</mi></mrow><mo>,</mo></msup></math></span> −martensite results in a more pronounced hardening effect, albeit at the cost of premature fracture. The present study offers a fundamental insight into the deformation mechanisms of 304L stainless steel during cyclic loading.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108859"},"PeriodicalIF":5.7,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143376692","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A cyclic elasto-plastic constitutive model based on physics informed neural network of a pure polycrystalline copper under uniaxial loading

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-05 DOI: 10.1016/j.ijfatigue.2025.108857

Tao Hu , Wenqing Zheng , Hai Xie , Tengwu He , Miaolin Feng

A cyclic elasto-plastic constitutive model based on physics informed neural network is constructed to describe the cyclic hardening as well as non-Massing behaviors of oxygen free highly conductive copper under fully reversed strain-controlled loading. By translating and rotating the data points, the tension branch and compression branch in stress–strain hysteresis loop are unified. Internal variables of de-hardening coefficient, unified back stress, and saturation back stress are summarized from the unified stress–strain data. In order to construct the relationship between the internal variables and plastic deformation with limited experimental data, the physics informed neural network is established by combining the physics information constraints and the artificial neural networks. And four multilayer perceptrons are trained to identify the internal variables. A plastic prediction-elastic correction algorithm is proposed in conjunction with multi-layer perceptron to solve the constitutive. To evaluate the model, an Armstrong-Frederick type model with strain memory surface is conducted for comparison. The results show the model based on physics informed neural network can obtain accurate results while avoiding a large number of material parameters and partial differential equations.

{"title":"A cyclic elasto-plastic constitutive model based on physics informed neural network of a pure polycrystalline copper under uniaxial loading","authors":"Tao Hu , Wenqing Zheng , Hai Xie , Tengwu He , Miaolin Feng","doi":"10.1016/j.ijfatigue.2025.108857","DOIUrl":"10.1016/j.ijfatigue.2025.108857","url":null,"abstract":"<div><div>A cyclic elasto-plastic constitutive model based on physics informed neural network is constructed to describe the cyclic hardening as well as non-Massing behaviors of oxygen free highly conductive copper under fully reversed strain-controlled loading. By translating and rotating the data points, the tension branch and compression branch in stress–strain hysteresis loop are unified. Internal variables of de-hardening coefficient, unified back stress, and saturation back stress are summarized from the unified stress–strain data. In order to construct the relationship between the internal variables and plastic deformation with limited experimental data, the physics informed neural network is established by combining the physics information constraints and the artificial neural networks. And four multilayer perceptrons are trained to identify the internal variables. A plastic prediction-elastic correction algorithm is proposed in conjunction with multi-layer perceptron to solve the constitutive. To evaluate the model, an Armstrong-Frederick type model with strain memory surface is conducted for comparison. The results show the model based on physics informed neural network can obtain accurate results while avoiding a large number of material parameters and partial differential equations.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"195 ","pages":"Article 108857"},"PeriodicalIF":5.7,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143387227","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Corrigendum to “J-integral analysis: An EDXD and DIC comparative study for a fatigue crack” [Int. J. Fatigue 134 (2020) 105474] j积分分析：EDXD和DIC对疲劳裂纹的比较研究[j]。J.疲劳134 (2020)105474 [j]

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-01 DOI: 10.1016/j.ijfatigue.2024.108722

A. Koko , P. Earp , T. Wigger , J. Tong , T.J. Marrow

引用次数: 0

An elastoplastic analysis of fretting crack nucleation: Correlation between critical distance and grain size

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-01 DOI: 10.1016/j.ijfatigue.2025.108854

Hugo Lannay , Siegfried Fouvry , Bruno Berthel , Camille Gandiolle , Pierre Arnaud

This study investigates the influence of microstructural size and stress gradients on crack nucleation in ferrite-pearlite steel under cylinder/plane fretting conditions. An experimental and numerical approach establishes a critical distance that correlates with grain size, revealing a significant distinction between elastic and elastoplastic behaviour. The results indicate that the optimal critical distance

l

approximates the grain size, highlighting that an internal stress exceeding the fatigue limit

σ_{d, - 1}

is needed to nucleate. The findings emphasize the necessity of elastoplastic modelling for accurately describing the mechanisms of crack nucleation under high stress gradients, as previous elastic-only analyses may yield misleading interpretations.

引用次数: 0

Equivalent initial damage sizes for PBF-LB Ti-6Al-4V notched geometries

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-02-01 DOI: 10.1016/j.ijfatigue.2025.108843

Zlatan Kapidžić , Stefan B. Lindström , Johan Moverare , Thomas Lindström , Carl-Johan Thore , Daniel Leidermark , Manja Franke

We propose a fracture mechanics based method for determination of equivalent initial damage size (EIDS) distribution in as-built additively manufactured (AM) Ti-6Al-4V notched geometries. The crack growth model is shown to correctly capture the effect of the stress raisers and load ratio on the fatigue life of notched specimens. Results of constant amplitude fatigue tests on notched round bar specimens, with two different stress concentration factors and at multiple load ratios, are fitted to a three-parameter Weibull distribution. Based on the surface roughness measurements performed in this study and in the literature, maximum surface valley depth is found to be a reasonable estimation of the median EIDS.

引用次数: 0

Enhanced strength but deteriorated fatigue crack propagation behaviors of an aviation Al-Li alloy sheet caused by solid-solution time extension

IF 5.7 2区材料科学 Q1 ENGINEERING, MECHANICAL

International Journal of Fatigue

Pub Date : 2025-01-31 DOI: 10.1016/j.ijfatigue.2025.108853

Xu-feng Cai , Hui Xiang , Zhen-zhen Liu , Guang-jun Zeng , Tian-le Liu , Zhi-min Cai , Hua Zhou , Bao Qi , Dan-Yang Liu , Jin-feng Li

The fatigue crack propagation (FCP) property and strength in T8-aged Al-Li alloy sheets with varying solid-solution time were investigated and the influence mechanism of the secondary phase on fatigue crack initiation was revealed. The results demonstrate that both grain dimension and recrystallization texture of the alloys with different solid-solution time are similar, but the average diameter of secondary phase particles decreases nearly monotonically with solid-solution time extension. The prolongation of solid-solution time leads to higher number density and size of T₁ precipitates during T8 aging due to the increased solute concentration, which enhances the strength and exacerbates the stress concentration in the plastic zone ahead of fatigue crack tip. While the homogeneously distributed fine dispersed phase particles separate from the matrix and form the site for crack initiation when the stress in the plastic zone reaches a relatively high level. The crack initiation sites provide highways for main crack propagation which accelerates the FCP. Consequently, prolonging the solid-solution time further facilitates the crack initiation process caused by the dispersed phase particles, and renders the FCP rate much higher at the rapid propagation stage.

{"title":"Enhanced strength but deteriorated fatigue crack propagation behaviors of an aviation Al-Li alloy sheet caused by solid-solution time extension","authors":"Xu-feng Cai , Hui Xiang , Zhen-zhen Liu , Guang-jun Zeng , Tian-le Liu , Zhi-min Cai , Hua Zhou , Bao Qi , Dan-Yang Liu , Jin-feng Li","doi":"10.1016/j.ijfatigue.2025.108853","DOIUrl":"10.1016/j.ijfatigue.2025.108853","url":null,"abstract":"<div><div>The fatigue crack propagation (FCP) property and strength in T8-aged Al-Li alloy sheets with varying solid-solution time were investigated and the influence mechanism of the secondary phase on fatigue crack initiation was revealed. The results demonstrate that both grain dimension and recrystallization texture of the alloys with different solid-solution time are similar, but the average diameter of secondary phase particles decreases nearly monotonically with solid-solution time extension. The prolongation of solid-solution time leads to higher number density and size of T<sub>1</sub> precipitates during T8 aging due to the increased solute concentration, which enhances the strength and exacerbates the stress concentration in the plastic zone ahead of fatigue crack tip. While the homogeneously distributed fine dispersed phase particles separate from the matrix and form the site for crack initiation when the stress in the plastic zone reaches a relatively high level. The crack initiation sites provide highways for main crack propagation which accelerates the FCP. Consequently, prolonging the solid-solution time further facilitates the crack initiation process caused by the dispersed phase particles, and renders the FCP rate much higher at the rapid propagation stage.</div></div>","PeriodicalId":14112,"journal":{"name":"International Journal of Fatigue","volume":"194 ","pages":"Article 108853"},"PeriodicalIF":5.7,"publicationDate":"2025-01-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143077742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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