The effect of inclusion factors on fatigue life and fracture-mechanics-based life method for a P/M superalloy at elevated temperature

Yang, Di; Shi, Yi; Miao, Guolei; Huang, Jen‐How; Li, Shaolin; Hu, Xiaoan; Liu, Fencheng; Huang, Weiqing

doi:10.1016/j.ijfatigue.2019.105365

Cited by 32 publications

(9 citation statements)

References 37 publications

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“…[1][2][3] Especially in recent days, the concept of very-high-cycle fatigue (VHCF) with over 10 7 cycles fatigue life has been widely concerned, and a series of research results have been obtained. [4][5][6] However, most of the experimental studies are limited to room temperature, and the S-N characteristics, 7-13 failure mechanism, [14][15][16][17][18][19][20][21][22][23][24] and fatigue life evaluation methods [25][26][27][28][29][30][31][32] under elevated temperature environment in VHCF regime are not yet well understood. Therefore, in order to ensure the long-term safety of structural components, the VHCF fatigue characteristics of structural materials in elevated temperature environment still needs to be further studied.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, based on the failure modes of components, some scholars have devoted themselves to studying the fatigue life evaluation methods of Ni-based superalloys, mainly focusing on establishing the relationship between the fatigue life and the maximum size of surface inclusions, 25 the maximum size and location of internal defects, 26 and the size, location of inclusions, the length of small cracks, 27 and so on. Additionally, Okazaki et al 28 showed the relationship between range of defect sizes and fatigue limit.…”

Section: Introductionmentioning

confidence: 99%

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High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Zhang

et al. 2021

Fatigue Fract Eng Mat Struct

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The tension-tension test with stress ratio 0.1 was conducted to clarify highcycle and very-high-cycle fatigue properties of Ni-based superalloy at 750 C by combining two-and three-dimensional microscopic observations. Results show that as stress level decreases, fatigue failure is less likely to be induced by pore, while the possibility of crystallographic facet-induced failure increases, and finally, the duplex S-N curves are formed. The larger roughness of crack nucleation region is mainly attributed to the geometric incompatibility of grains and the plastic deformation at crack tip. Under the influence of elevated temperature and vacuum environment, the transition size from small crack to long crack is approximately equal to the grain size. Combined with the evaluation of threshold values, the internal failure mechanism is elucidated. Finally, from the viewpoint of energy, a fatigue life prediction model is proposed, and the predicted results are in good agreement with the experimental ones.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Zhang

et al. 2021

Fatigue Fract Eng Mat Struct

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“…where a 0 is the initial crack length equal to the thickness of the coating (41.5 μm), as observed in section "Microstructure of MCrAlY-coated superalloys". The critical crack length a t , which was equal to 0.6 mm, was determined by fracture toughness [35,36] observed from the fracture surface. Therefore, after obtaining N sub , the fatigue life of the coating-affected area can be calculated using Equation (2).…”

Section: Substrate Cracking Behaviourmentioning

confidence: 99%

Low-cycle fatigue of MCrAlY-coated superalloys: A fracture mechanics-based analysis

Yang¹,

Song

et al. 2021

Materials Science and Technology

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A fracture mechanics-based method was proposed to quantify the low-cycle fatigue (LCF) life reduction of superalloys deposited with MCrAlY coating. A series of LCF tests were conducted under different temperatures to verify the accuracy of the model. The effect of the coating shows temperature-related behaviour. At 980°C, the coating reduced the LCF life of the samples. Furthermore, the coating-induced fatigue life reduction increased with the stress amplitude. However, at 850°C, the coating was beneficial to the fatigue life at low-stress amplitudes but harmful at high stress amplitudes. Based on the aforementioned data, a life-prediction model of the coated superalloy was proposed that agreed well with the test results.

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“…Under cyclic loading, the stress concentration caused by these defects would lead to serious local plastic strain accumulation, and consequently the fatigue crack initiates. In particular, the variety and irregular geometric features of AM defects, which have a significant influence on fatigue failure, are different from hard particles in traditional titanium alloys and inclusions in powder metallurgy superalloys [1][2][3].…”

Section: Introductionmentioning

confidence: 99%

Fatigue life affected by various defects of a selective laser-manufactured Titanium alloy

Zhang

Teng

et al. 2023

Materials Science and Technology

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Manufacturing defects introduced by selective laser melting of powder beds typically lead to lower fatigue strength and a larger scatter in fatigue life compared to conventional manufacturing methods. In this paper, the effect of build direction on the low cycle fatigue performance of laser powder bed fused Ti6Al4V alloy was studied. Tests under room temperature were conducted and fractographies were examined to identify the crack initiation source. Results show that fatigue cracks in all samples initiated from sub-surface pores. The roundness of pores was proved to have an influence on fatigue life. Therefore, pores were assumed as existing cracks and its roundness was used to modify a fracture mechanic-based life prediction model.

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The effect of inclusion factors on fatigue life and fracture-mechanics-based life method for a P/M superalloy at elevated temperature

Cited by 32 publications

References 37 publications

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

High‐cycle and very‐high‐cycle fatigue behavior and life prediction of Ni‐based superalloy at elevated temperature

Low-cycle fatigue of MCrAlY-coated superalloys: A fracture mechanics-based analysis

Fatigue life affected by various defects of a selective laser-manufactured Titanium alloy

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