Effect of hot corrosion on low cycle fatigue behavior of superalloy IN718

Mahobia, Girija Shankar; Paulose, Neeta; Mannan, S.L.; Sudhakar, R.; Chattopadhyay, Kausik; Srinivas, N.C. Santhi; Singh, Vakil

doi:10.1016/j.ijfatigue.2013.08.009

Cited by 70 publications

(28 citation statements)

References 24 publications

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“…were the major cause of cyclic softening. Shearing of precipitates as the cause of cyclic softening has been reported in many other investigations at different temperatures . It was also observed during isothermal LCF tests that the cyclic softening rate is higher at higher values of total strain amplitude.…”

Section: Discussionsupporting

confidence: 70%

“…Shearing of precipitates as the cause of cyclic softening has been reported in many other investigations at different temperatures. [19][20][21] It was also observed during isothermal LCF tests that the cyclic softening rate is higher at higher values of total strain amplitude. During CF tests with tensile hold conditions, stress relaxation at mid-life is shown in Fig.…”

Section: Discussionmentioning

confidence: 99%

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Micromechanism of cyclic plastic deformation of alloy IN 718 at 600 °C

Banerjee

Sahu

Paulose

et al. 2016

Fatigue Fract Eng Mat Struct

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In the present investigation, an attempt was made to understand the cyclic deformation micromechanism of gas turbine alloy Inconel 718 at 600 °C (i) by conducting low cycle fatigue and creep–fatigue interaction tests and (ii) by studying the microstructure evolution in the material during fatigue tests through extensive electron microscopy. Bilinear slope was obtained in the Coffin–Manson plot for all low cycle fatigue tests, and it was confirmed through transmission electron microscopic examination that microtwinning was the predominant mode of deformation at low plastic strain values, whereas slip and shearing of γ″ precipitates were the predominant mode of deformation at higher plastic strain values. Fatigue life was adversely affected when hold time was introduced at peak tensile strain during creep–fatigue interaction tests. Formation of stepped interface at microtwin boundaries and coarsening of niobium carbide precipitates were observed to be the major microsturctural changes during creep–fatigue interaction tests.

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Section: Discussionsupporting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Micromechanism of cyclic plastic deformation of alloy IN 718 at 600 °C

Banerjee

Sahu

Paulose

et al. 2016

Fatigue Fract Eng Mat Struct

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“…8 to 12, where grain boundary oxidation is prominently shown for type I hot corrosive atmosphere and surface cracking is prominently shown in type II hot corrosive atmosphere. From the mechanism of hot corrosion it is documented that type I hot corrosion generally proceeds in two stages: an incubation period exhibiting a low corrosion rate, followed by accelerated corrosion attack [10][11][12][13][14][15][16][17]. The incubation period is related to the formation of a protective oxide scale.…”

Section: Discussionmentioning

confidence: 99%

“…Mahobia et al [12] have also studied the effect of hot corrosion on low cycle fatigue behavior by conducting fatigue tests on nickel base superalloy IN718 and have observed drastic reduction in fatigue life of the salt coated samples over the entire strain amplitudes tested at 650°C.…”

Section: Introductionmentioning

confidence: 99%

Isothermal high temperature low cycle fatigue behavior of Nimonic-263: Influence of type I and type II hot corrosion

Sahu

Kumar

Das

et al. 2015

Materials Science and Engineering: A

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“…Therefore, the dimensional model of a corrosion pit can be used to represent LTHC damage . The morphology of HTHC structures is more complicated . However, little research has been done about life prediction of superalloys under the combined effect of HTHC and fatigue.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation and life prediction of hot corrosion pre‐exposure on low‐cycle fatigue of a directionally solidified nickel‐base superalloy

Yang

et al. 2015

Fatigue Fract Eng Mat Struct

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Low‐cycle fatigue tests were conducted on the directionally solidified nickel‐base superalloy DZ125 at 850 °C in the unexposed and exposed specimens for 2, 15, 25 and 50 h in hot corrosion environment. The pre‐exposed specimen exhibited a lower life than unexposed specimens. Fatigue cracks in the unexposed specimens are initiated from defects near the surface, while the cracks of exposed specimens preferentially occur on the surface. Hot corrosion damage in fatigue life was found to be associated with the reduction of the bearing area. A novel life prediction methodology based on continuum damage mechanics was proposed to predict the experimentally observed decrease in low‐cycle fatigue life with increasing prior exposure time.

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Effect of hot corrosion on low cycle fatigue behavior of superalloy IN718

Cited by 70 publications

References 24 publications

Micromechanism of cyclic plastic deformation of alloy IN 718 at 600 °C

Micromechanism of cyclic plastic deformation of alloy IN 718 at 600 °C

Isothermal high temperature low cycle fatigue behavior of Nimonic-263: Influence of type I and type II hot corrosion

Experimental investigation and life prediction of hot corrosion pre‐exposure on low‐cycle fatigue of a directionally solidified nickel‐base superalloy

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