Experimental evaluation on elevated temperature fatigue and tensile properties of one selective laser melted nickel based superalloy

Jiao, Zehui; Lei, Liming; Yu, Huai; Fei, Xu; Xu, Ruida; Wu, Xiaohu

doi:10.1016/j.ijfatigue.2018.12.024

Cited by 39 publications

(7 citation statements)

References 19 publications

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“…Contrary to other studies, Jiao et al [36] studied the elevated-temperature tensile and fatigue performances of K536 Ni-based superalloy manufactured by SLM, and they found that the material does not experience a significant anisotropic behavior.…”

Section: Introductionmentioning

confidence: 93%

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

et al. 2020

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The present study was focused on the assessment of microstructural anisotropy of IN 625 manufactured by selective laser melting (SLM) and its influence on the material’s room temperature tensile properties. Microstructural anisotropy was assessed based on computational and experimental investigations. Tensile specimens were manufactured using four building orientations (along Z, X, Y-axis, and tilted at 45° in the XZ plane) and three different scanning strategies (90°, 67°, and 45°). The simulation of microstructure development in specimens built along the Z-axis, applying all three scanning strategies, showed that the as-built microstructure is strongly textured and is influenced by the scanning strategy. The 45° scanning strategy induced the highest microstructural texture from all scanning strategies used. The monotonic tensile test results highlighted that the material exhibits significant anisotropic properties, depending on both the specimen orientation and the scanning strategy. Regardless of the scanning strategy used, the lowest mechanical performances of IN 625, in terms of strength values, were recorded for specimens built in the vertical position, as compared with all the other orientations.

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Section: Introductionmentioning

confidence: 93%

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

et al. 2020

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“…1 Selective laser melting (SLM) is one of the most popular AM techniques, which is capable of medium build rates, good repeatability, and medium to high surface quality. 2,3 To date, many metal materials like titanium alloys, 4 superalloys, 5,6 and aluminum alloys 7 have been successfully printed by AM methods and studied for fatigue behavior. Hu et al 6 studied on the fatigue crack growth behavior of SLM Inconel 625.…”

Section: Introductionmentioning

confidence: 99%

Study on fatigue crack growth behavior of selective laser‐melted Ti6Al4V under different build directions, stress ratios, and temperatures

Jiao

2022

Fatigue Fract Eng Mat Struct

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The experimental study of fatigue crack growth (FCG) behavior in Ti6Al4V alloy manufactured by selective laser melting (SLM) was carried out on an in situ fatigue testing machine. Two specimen orientations relative to the build direction (horizontal and vertical), two temperatures (room temperature, RT, and 400 C), and two stress ratios (0.1 and 0.5) were considered, and the FCG curves with the threshold values were determined. The results showed that the FCG properties were affected by the stress ratio due to different degree of crack closure and temperature with grain softening at 400 C in threshold and Paris region. The threshold value is highly dependent on the build direction of the alloy, which was caused by the anisotropic microstructure, while in the Paris region, the effect of material direction can be negligible and FCG rate tends to be consistent. The fracture mechanism at different stages was discussed and revealed by the fracture morphology observation using scanning electron microscopy.

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“…Besides, Xu et al 9 studied the S-N characteristics under different stress ratios in HCF regime, obtained that the S-N curves showed a linear downward trend under different stress ratios, and the fatigue limit rises as the stress ratio improves. For the influence of temperature, Nezhadfar et al 10 and Jiao et al 11 found that the S-N curves of Ni-based superalloys showed a linear downward trend at different temperatures. However, some other researchers found that temperature may induce the occurrence of duplex S-N curves from low-cycle fatigue (LCF) to HCF.…”

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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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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Experimental evaluation on elevated temperature fatigue and tensile properties of one selective laser melted nickel based superalloy

Cited by 39 publications

References 19 publications

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

Microstructural and Tensile Properties Anisotropy of Selective Laser Melting Manufactured IN 625

Study on fatigue crack growth behavior of selective laser‐melted Ti6Al4V under different build directions, stress ratios, and temperatures

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

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