Ultrasonic fatigue performance of high temperature structural material Inconel 718 alloys at high temperature after UNSM treatment

Amanov, Auezhan; Pyun, Young Sik; Kim, J.-H.; Suh, Chang‐Min; Cho, I.-S.; Kim, H.-D.; Wang, Hongtao; Khan, Muhammad Kashif

doi:10.1111/ffe.12330

Cited by 43 publications

(22 citation statements)

References 9 publications

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“…Its mechanical and corrosion properties are maintained at temperatures as high as 700 • C, making the Inconel 718 alloy suitable for demanding working conditions [1,[4][5][6]. Among the high strength, fatigue, creep and wear resistance properties, Inconel 718 also has favorable weldability [7][8][9][10]. The outstanding mechanical and corrosion properties of Inconel 718 are attributed to its microstructure, which is mainly constituted of austenite, γ phase.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the DOS by DL−EPR of UNSM Processed Inconel 718

Martin

Ress

Bosch

et al. 2020

Metals

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In this work, influence of ultrasonic nanocrystal surface modification (UNSM) on the degree of sensitization (DOS) in Inconel 718 has been studied and correlated with the resulting microstructure. The UNSM processed samples decreased their grain size from 11.9 µm to 7.75 µm, increasing the surface of grain boundaries, and thus enhancing the area where δ phase and niobium carbides precipitate. The effect of the UNSM process on the DOS of Inconel 718 was studied by the double loop electrochemical potentiokinetic reactivation (DL−EPR) test. The DL−EPR showed that for UNSM processed samples with no thermal treatment, the DOS increased up to 59.6%, while for UNSM treated samples that were post-annealed at 1000 °C for 10 min and water quenched the DOS decreased down to 40.9%. The increase of grain boundaries surface area and triple junctions after the UNSM process enables the formation of twice the amount of δ phase compared to the as-received Inconel 718 bulk sample. The area fraction of the grain boundary covered by δ phase was of 9.87% in the UNSM region while in the bulk the area fraction was 4.09%. In summary, it was found that after UNSM process, the annealing at 1000 °C for 10 min and water quenching promoted the transformation of γ″ to form δ phase on the grain boundaries, which reduces the intergranular corrosion susceptibility.

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Section: Introductionmentioning

confidence: 99%

Evaluation of the DOS by DL−EPR of UNSM Processed Inconel 718

Martin

Ress

Bosch

et al. 2020

Metals

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“…A large number of studies suggested that the fatigue strength of a material is proportional to its tensile strength and the fatigue crack that results in final failure usually initiates at the surface of the material [1][2][3]. In order to upgrade the fatigue strength of engineering materials/components, investigators have used surface strengthening techniques in the applications of aviation, automobile and high-speed railway [4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Zhang

Xie

Jiang

et al. 2017

Materials Science and Engineering: A

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A B S T R A C TThis paper experimentally investigated the behavior of fatigue crack growth of an axle steel with a surface strengthened gradient microstructure layer. First, the microstructure, residual stress and mechanical properties were examined as a function of depth from surface. Then the fatigue crack growth rate was measured via three point bending fatigue testing. The results indicated that fatigue crack growth rate decelerated first and then accelerated with the increase of crack length within the gradient layer. Especially, the fatigue crack was arrested in the gradient layer under relatively low stress amplitude due to the increase of threshold value for crack growth within the range of 3 mm from surface. Based on these results, the parameters of Paris equation and the threshold value of stress intensity factor range within the gradient layer were determined and a curved surface was constructed to correlate crack growth rate with stress intensity factor range and the depth from surface. The effects of microstructure, residual stress and surface notch on the crack growth behavior were also discussed.

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“…It has similar microstructure and mechanical behaviour to those of Inconel 718. This kind of alloy has been widely utilized for fabricating modern aero‐engine components such as turbine discs, blades and cases for the reason that it has a good resistance to fatigue, oxidation and corrosion . There had been a few investigations on the small fatigue crack initiation and growth behaviour of Inconel 718 and nickel base superalloy GH4169.…”

Section: Introductionmentioning

confidence: 99%

“…This kind of alloy has been widely utilized for fabricating modern aero-engine components such as turbine discs, blades and cases for the reason that it has a good resistance to fatigue, oxidation and corrosion. [10][11][12] There had been a few investigations on the small fatigue crack initiation and growth behaviour of Inconel 718 and nickel base superalloy GH4169. Goto et al 13 studied the fatigue damage of Inconel 718 at room temperature and 500°C.…”

Section: Introductionmentioning

confidence: 99%

Investigation of small fatigue crack initiation and growth behaviour of nickel base superalloy GH4169

Zhu

et al. 2016

Fatigue Fract Eng Mat Struct

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Surface replication method was utilized to monitor the small fatigue crack initiation and growth process of single‐edge‐notch tension specimens fabricated by nickel base superalloy GH4169. Three different stress levels were selected. Results showed that small fatigue cracks of nickel base superalloy GH4169 initiated from grain boundaries or surface inclusions. The small fatigue crack initiation and growth stages took up about 80–90% of the total fatigue life. Multiple major cracks were observed in the notch root, and specimen with more major cracks seemed to have smaller fatigue life under the same test conditions. At the early growth stage, small crack behaviour might be strongly influenced by microstructures; thus, the crack growth rates had high fluctuations. However, the stress level effect on the small fatigue crack growth rates was not distinguishable for the three different stress levels. And no clear differences were found among the crack initiation lives by using replication technique.

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Ultrasonic fatigue performance of high temperature structural material Inconel 718 alloys at high temperature after UNSM treatment

Cited by 43 publications

References 9 publications

Evaluation of the DOS by DL−EPR of UNSM Processed Inconel 718

Evaluation of the DOS by DL−EPR of UNSM Processed Inconel 718

Fatigue crack growth behavior in gradient microstructure of hardened surface layer for an axle steel

Investigation of small fatigue crack initiation and growth behaviour of nickel base superalloy GH4169

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