Failure analysis of a gas turbine blade made of Inconel 738LC alloy

Mazur, Z.; Luna-Ramírez, A.; Juárez-Islas, J. A.; Campos‐Amezcua, Alfonso

doi:10.1016/j.engfailanal.2004.10.002

Cited by 194 publications

(80 citation statements)

References 7 publications

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“…This bucket operated for 24,000 hours. Mazur et al [16] found that the maximum stresses are present in the blade cooling channels, producing cracks. Figure 18 shows that kind of cracks.…”

Section: Temperature Distribution Inside the Blade Bodymentioning

confidence: 99%

“…The ribs were placed on the inner surface of the cooling channels in order to increase the heat transfer from the solid body to the cooling air. Also, in Figure 1 can be seen that the ribs were only placed in the middle blade zone inside the cooling channels; because in this zone the largest temperature gradient is present [15], causing failure such as cracks in the blade structure [16].…”

Section: Computational Model and Gridmentioning

confidence: 99%

“…Mazur [16] performed an analysis of a gas turbine bucket failure made of Inconel 738LC super alloy. This bucket operated for 24,000 hours.…”

Section: Temperature Distribution Inside the Blade Bodymentioning

confidence: 99%

See 2 more Smart Citations

Conjugate Heat Transfer in Ribbed Cylindrical Channels

Gallegos-Muñoz¹,

Uzarraga-Rodriguez²,

Elizalde‐Blancas³

2012

An Overview of Heat Transfer Phenomena

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“…This bucket operated for 24,000 hours. Mazur et al [16] found that the maximum stresses are present in the blade cooling channels, producing cracks. Figure 18 shows that kind of cracks.…”

Section: Temperature Distribution Inside the Blade Bodymentioning

confidence: 99%

Section: Computational Model and Gridmentioning

confidence: 99%

See 1 more Smart Citation

Conjugate Heat Transfer in Ribbed Cylindrical Channels

Gallegos-Muñoz¹,

Uzarraga-Rodriguez²,

Elizalde‐Blancas³

2012

An Overview of Heat Transfer Phenomena

View full text Add to dashboard Cite

“…10b. Block type MC carbides as crack initiators at their interface with the matrix and failure propagated along this interface have cleavage feature [20].…”

Section: Fractography Of In 738lc Superalloymentioning

confidence: 99%

Comparative strain analysis of 34CrMo4 steel and Inconel 738LC

Štamborská¹,

Losertová²,

Konečná³

et al. 2021

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The comparative analysis of mechanical properties using a digital image correlation by Vic 2D software was performed for two types of high-strength materials. The strain analysis during tensile tests was carried out on the cylinder tensile specimens of 34CrMo4 steel and IN 738LC superalloy. Both materials showed similar strength but different ductility. While the 34CrMo4 steel showed typical necking of tensile specimens with ductile fracture surfaces, cracking of the IN 738LC became without necking, and the fracture morphology displayed mixed feature with ductile dimples or quasi-cleavage areas and cracked carbides. Microhardness measurements completed metallographic and fractographic studies of tensile samples.

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“…Some examples of blade release investigations may be found in [1][2][3][4][5][6]. Evaluation of the root cause is assisted through usage of the EDS technique, helping understanding of the evolution of the crack with time.The EDS technique and fundamentals is described in [7][8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Energy Dispersive X-ray technique applied to fatigue fracture surfaces oxidation to provide information on growth rate

Hernandez¹,

Saunders

Madariaga³

2018

MATEC Web Conf.

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Abstract. Gas turbine components are strongly affected by cyclic loading during operation, which makes fatigue development the most significant cause of failure or cracking within them. The nature and growth rate of that fatigue is dependent on the stress experienced at a particular area of a part, the temperature, the material properties and the applied loading frequency. Various techniques, such as striation and/or band counting can, in some cases, provide information on fatigue life. However, often such techniques are rendered useless by lack of formation or obliteration by damage and/or oxidation of such features. Once a crack has initiated and is exposed to the engine atmosphere, the level of oxidation and other contaminant elements observed on the crack surface will evolve with time, and, correspondingly, crack depth. Element distribution analysis by an Energy Dispersive x-ray Spectroscopy (EDS) technique applied along a fatigue fracture surface could help to understand the evolution of the crack with time.Using EDS, an experimental procedure was carried out to ascertain a perceived measured percentage of oxygen plus other additional chemical species at a large number of stations along the length of a fatigue crack. The analysis was performed from the initiation site to the end of the propagation area, and also within the final rupture zone which had less time exposed to air and gasses compared to the fatigue system. An exercise of comparison between that progression in oxidation across cracked in-service components versus perceived measured oxidation level analyses on trial fracture surfaces exposed in atmospheric oven conditions at high temperatures for a number of different durations was performed. The obtained results provided information on specific questions concerning the fatigue propagation life of the in-service components; thereby amplifying the use of the EDS technique in this aspect of the materials forensic field.

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Failure analysis of a gas turbine blade made of Inconel 738LC alloy

Cited by 194 publications

References 7 publications

Conjugate Heat Transfer in Ribbed Cylindrical Channels

Conjugate Heat Transfer in Ribbed Cylindrical Channels

Comparative strain analysis of 34CrMo4 steel and Inconel 738LC

Energy Dispersive X-ray technique applied to fatigue fracture surfaces oxidation to provide information on growth rate

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