A study of low cycle fatigue life and its correlation with microstructural parameters in IN713C nickel based superalloy

Cantó, Jorge; Winwood, S.; Rhodes, Katie; Birosca, S.

doi:10.1016/j.msea.2018.01.083

Cited by 22 publications

(12 citation statements)

References 30 publications

(51 reference statements)

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“…The materials used in this study was IN713C nickel-based superalloy with the chemical composition shown in Table 1. As described in Section 1, during investment casting of turbocharger turbine blades, the complex geometrical configuration leads to different cooling rates in different areas, resulting in disparity of grain structure across the blade, i.e., large columnar grain area, fine equiaxed grains at the tip of blades and transition area between the two (Salvat Cantó et al, 2018;Coleman et al, 2016).…”

Section: Bars Produced By Investment Castingmentioning

confidence: 99%

“…In order to study the effects of all three grain structures on fatigue property, three different microstructures of columnar, equiaxed and transition bars were produced via investment casting at Cummins Turbo Technologies at Huddersfield, UK. The initial LCF property of these bars was recently reported in (Salvat Cantó et al, 2018). The detailed manufacturing process for the bars can be found in (Salvat Cantó et al, 2018).…”

Section: Bars Produced By Investment Castingmentioning

confidence: 99%

“…The initial LCF property of these bars was recently reported in (Salvat Cantó et al, 2018). The detailed manufacturing process for the bars can be found in (Salvat Cantó et al, 2018). The produced bars of the three distinctive microstructures, i.e., transition, equiaxed and columnar, are shown in Fig.…”

Section: Bars Produced By Investment Castingmentioning

confidence: 99%

“…Therefore, the deformation process would be mainly determined by the local plasticity and local heterogeneous structures. The selection of total strain of 0.4% in the current study was based on our previous investigation results on IN713C under the same loading conditions (Salvat Cantó et al, 2018).…”

Section: Fatigue Life and Overview Of Fracture Surfacementioning

confidence: 99%

“…Moreover, superalloy produced via investment casting also has the advantage of minimising machining process compared to the forged alloys, which is of significant economic efficiency and enable massive industrial production. IN713C has been widely used as turbocharger turbine wheel materials in the automotive industry for decades (Salvat Cantó et al, 2018;Liu et al, 2018). However, casting has an inherent problem of porosity formation (shrinkage and/or gas pore) and usually results in relatively large grains, which degrades the alloy's fatigue property to a great degree.…”

Section: Introductionmentioning

confidence: 99%

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The effects of grain size, dendritic structure and crystallographic orientation on fatigue crack propagation in IN713C nickel-based superalloy

Liu

Winwood

Rhodes

et al. 2020

International Journal of Plasticity

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The polycrystalline IN713C produced via investment casting is one of the widely-used nickel-based superalloy in automotive and aerospace industries. This alloy, however, has an apparent inhomogeneous microstructure generated during casting and contains dendritic structure that gives rise to strain localisation during loading. Yet, the effect of dendritic structure, grain size and shape as well as crystallographic orientation, which directly influence fatigue property and deformation micromechanism in the components, is rarely studied. In the present study, IN713C cast bars are tailored with three different grain structures, i.e., transition, equiaxed and columnar, with substantial grain size variations. The produced bars were tested under strain controlled LCF (Low Cycle Fatigue) and stress controlled HCF (High Cycle Fatigue) conditions at 650 °C. The results showed that most of fatigue cracks initiated from casting pores and fatigue life extended in the microstructure with a small grain size during both HCF and LCF loadings. It is also demonstrated that fatigue striations were mainly observed within dendritic areas during crack propagation, whereas the higher GND (Geometrically Necessary Dislocation) density were predominantly observed in the interdendritic 2 areas. Here, we propose a concept of 'Crack Propagation Unit (CPU)' for better description of deformation mechanism at local scale during fatigue loading by combining fracture surface characteristic methodology and dislocation distribution analyses within the dendritic structural unit. Furthermore, this model to understand the deformation micromechanism can provide a new perspective on the interpretation of Hall-Petch relationship in casting materials that contain dendritic structure. This is further demonstrated via direct correlation of the high crack propagation resistance with the crack path divergence instead of the dislocation pileup at the grain boundary or in-between the γ/ γ' channels. Moreover, by utilising serial sectioning method followed by layered EBSD scanning, quasi-3-D grain orientation mappings were obtained, and crystallographic texture information were directly correlated with the fracture surface observations. This allowed an investigation of the influence of orientation of individual grains and micro/macro texture on crack propagation rate. The critical stage of crack propagation in fatigue life and its correlations with microstructural features is established, offering potential practical applications by controlling the investment casting process parameters.

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Section: Bars Produced By Investment Castingmentioning

confidence: 99%

Section: Bars Produced By Investment Castingmentioning

confidence: 99%

Section: Bars Produced By Investment Castingmentioning

confidence: 99%

Section: Fatigue Life and Overview Of Fracture Surfacementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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The effects of grain size, dendritic structure and crystallographic orientation on fatigue crack propagation in IN713C nickel-based superalloy

Liu

Winwood

Rhodes

et al. 2020

International Journal of Plasticity

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Influence of Melt-Pouring Temperature and Composition of Primary Coating of Shell Mold on Tensile Strength and Creep Resistance of Ni-Based Superalloy

Rakoczy

Grudzień

Cygan

2019

J. of Materi Eng and Perform

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Eight investment castings of Inconel 713C superalloy were fabricated, varying in the melt-pouring temperature, from 1400 to 1520°C, and CoAl 2 O 4 inoculant content, 0 or 5 wt.%, in the primary coat. Their influence on grain size on tensile and creep properties was investigated. The best combination of yield stress (815 MPa) and elongation (A 4 = 7.65%) at ambient temperature was obtained in surface-modified castings poured from 1520°C. The longest time to rupture was for the unmodified castings (76.8 h) poured from 1520°C, while for the modified variant, the time to rupture was lower around, 7.4 h, which was still a satisfactory value. During tensile testing, microcracks were formed in large eutectic c¢, carbides and borides, due to the accumulation of stress at interfaces with the matrix. During creep, N-type rafting of c¢ precipitates and phase transformation MC + c fi c¢ + M 23 C 6 took place.

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Failure analysis of a first stage turbine blade made of directionally solidified GTD111 superalloy and repaired by welding process

Zhixin,

Wu,

Xiangde

et al. 2023

Engineering Failure Analysis

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A study of low cycle fatigue life and its correlation with microstructural parameters in IN713C nickel based superalloy

Cited by 22 publications

References 30 publications

The effects of grain size, dendritic structure and crystallographic orientation on fatigue crack propagation in IN713C nickel-based superalloy

The effects of grain size, dendritic structure and crystallographic orientation on fatigue crack propagation in IN713C nickel-based superalloy

Influence of Melt-Pouring Temperature and Composition of Primary Coating of Shell Mold on Tensile Strength and Creep Resistance of Ni-Based Superalloy

Failure analysis of a first stage turbine blade made of directionally solidified GTD111 superalloy and repaired by welding process

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