The interactions between fatigue, creep and environmental damage in Ti 6246 and Udimet 720Li

Evans, W.J.; Jones, Jonathan; Williams, S.

doi:10.1016/j.ijfatigue.2005.06.029

Cited by 48 publications

(24 citation statements)

References 3 publications

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“…LTHC process becomes less effective above 700°C and HTHC becomes the dominant mode of attack. Most of the researches and nearly all the manufacturer's information on mechanical properties of metals and alloys have been based on the tests conducted in air or in vacuum including low cycle fatigue (LCF) [9][10][11][12][13][14][15]. Studies on the effect of salt coatings on LCF behavior of superalloys are quite limited.…”

Section: Introductionmentioning

confidence: 99%

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

Mahobia

Paulose

Mannan

et al. 2014

International Journal of Fatigue

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Section: Introductionmentioning

confidence: 99%

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

Mahobia

Paulose

Mannan

et al. 2014

International Journal of Fatigue

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“…[4] Processing and heat treatment adopted for alloy 720Li to achieve a fine-grained structure required for high-strength and low-cycle-fatigue (LCF) resistant turbine disc application is significantly different from that adopted for alloy 720 for creep-resistant blade application. While some issues related to processing of alloy 720Li [5] and mechanical properties such as LCF [6][7][8] and fatigue crack growth rates [7,9] of cast and wrought alloy 720Li have been addressed, not much information on the tensile behavior is available in open literature. In this article, we examine the effects of temperature and strain rate on tensile properties of alloy 720Li to gain detailed understanding of the underlying micromechanisms of deformation.…”

Section: Introductionmentioning

confidence: 99%

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

Gopinath

Gogia

Kamat

et al. 2008

Metall Mater Trans A

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Tensile properties, deformation, and fracture behavior of a wrought nickel-base superalloy 720Li have been studied in standard solutionized and two-stage-aged condition in the temperature range of 25°C to 750°C. Effect of strain rate on tensile behavior was assessed at 25°C, 400°C, and 750°C at five strain rates that range between 10 -5 s -1 and 10 -1 s -1 . The yield strength and ultimate tensile strength of the alloy remained unaffected by temperature until about 600°C and 500°C, respectively, typical of superalloys strengthened by fine and coherent intermetallic Ni 3 Al-based precipitates. The flow stress of the alloy was found to be insensitive to the strain rates studied at 25°C and 400°C. However, at 750°C, the flow stresses showed strain rate sensitivity at strain rates <10 -3 s -1 . The strain hardening behavior at 25°C and 400°C were similar. At 750°C, stain hardening was observed only at strain rates >10 -3 s -1 , and at lower strain rates, tensile instability was seen to set in immediately after yielding. The alloy exhibited ductile dimple fracture at all the temperatures and strain rates studied. Microstructural investigations indicate that in regimes where flow stresses are insensitive to strain rate, deformation occurs through heterogeneous planar slip, whereas in strain rate sensitive regimes, thermally activated diffusion processes promote homogeneous deformation.

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“…In particular, the Walker strain relationship has previously been shown to provide an effective means of predicting notch behaviour [1,2]. In the present situation, however, inconsistencies were identified which were attributed to the presence of casting pores.…”

Section: Introductionmentioning

confidence: 59%

The Characterisation and Prediction of LCF Behaviour in Nickel Single Crystal Blade Alloys

Evans¹,

Lancaster²,

Steele³

et al. 2008

Superalloys 2008 (Eleventh International Symposium)

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The paper focuses on CMSX4 and two experimental alloys, LDSX5 and LDSX6, developed to provide alternative performance attributes. The specific objective in this work was an exploration of the Low Cycle Fatigue (LCF) characteristics of these three alloy variants and the assessment of methods for predicting the observed lives. A comparison of the alloys is presented in relation to their strain control fatigue response and notch fatigue behaviour. Predictions of notch lives are made from the plain specimen data but found to be extremely pessimistic at the lower temperature studied, 650°C. The inaccuracies are attributed to the presence of casting pores. Using measured crack growth data and pore sizes, it is shown that fracture mechanics calculations of residual lives are more appropriate. At 800°C, the higher temperature studied, Walker strain predictions of notch lives are more meaningful. This is explained in terms of the relaxation of stresses at the defects.

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The interactions between fatigue, creep and environmental damage in Ti 6246 and Udimet 720Li

Cited by 48 publications

References 3 publications

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

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

Tensile Properties of Ni-Based Superalloy 720Li: Temperature and Strain Rate Effects

The Characterisation and Prediction of LCF Behaviour in Nickel Single Crystal Blade Alloys

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