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M. Madan

Bio: M. Madan is an academic researcher from Council of Scientific and Industrial Research. The author has contributed to research in topics: Turbine blade & Heat-affected zone. The author has an hindex of 5, co-authored 9 publications receiving 66 citations.

Papers
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TL;DR: In this paper, the failure of a pressure safety valve (PSV) in a petroleum refinery was investigated and it was found that the failure had occurred due to stress corrosion cracking (SCC) caused by a high amount of chloride ions in the operating environment.

27 citations

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TL;DR: In this article, the basic microstructural features in cast nickel base superalloys that control the failure mechanisms in gas turbine blades followed by analysis of two service failures are reported. But, the study of these failures requires detailed micro-structural examination.

27 citations

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TL;DR: The investigation of a twin-engine fighter aircraft accident is an example of how systematic approach to a failure can help in bringing out the truth in conflicting situations.

12 citations

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TL;DR: In this paper, a fighter aircraft met with an incident during a routine flight operation wherein pilot noticed a thin trail of smoke coming out from the tail end of the aircraft, and post landing inspection revealed that there was fire in the afterburner section of aircraft.

9 citations

Journal ArticleDOI
TL;DR: In this paper, an analysis of two service failure cases wherein the high pressure turbine blades had failed in flight leading to aircraft accidents is presented. And the microstructural study provides important information in identifying whether the blades had faulty microstructure to start with or the abnormalities observed have resulted during exposure to service conditions.
Abstract: Cast nickel base superalloys are extensively used for high temperature gas turbine blade applications. The elevated temperature properties in these alloys are optimized through engineered microstructure, which is a combination of (a) γ-solid solution of Ni with elements such as W, Mo, Cr, Ta, Re etc, (b) γ′ precipitates, and (c) dispersed carbides. Over the years, the demand for high engine efficiency has resulted in the development of new generation superalloys with improved elevated temperature properties, especially creep resistance. These superalloys are highly alloyed with solid-solution strengthening elements and hence, impose greater technological challenges in fabrication. Due to high alloy contents, these alloys are prone to formation of detrimental phases such as the topologically close packed (TCP) phases. These phases may appear in the microstructure during the blade fabrication stages or precipitate out during exposure to high temperature and stress. In addition, the γ′ precipitates can change in morphology, shape and size during applications resulting in deterioration in high temperature mechanical properties, in general. These unfavorable microstructural changes often lead to premature failure in gas turbine engines. While analyzing these failures, the microstructural study provides important information in identifying whether the blades had faulty microstructure to start with or the abnormalities observed have resulted during exposure to service conditions. This in turn can be related to engine operating conditions. In the present paper, this has been demonstrated through analysis of two service failure cases wherein the high pressure turbine blades had failed in flight leading to aircraft accidents.

6 citations


Cited by
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Journal ArticleDOI
TL;DR: In this article, a model was developed by Cormier and Cailletaud (2010) to fulfill the effects of fast microstructure evolutions occurring upon high temperature non-isothermal loadings.

124 citations

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TL;DR: A review of the general approaches following the passive and active control technologies are presented, which are including optimal layout technique of pipeline and clamps, constrained layer damping technique, vibration absorber technique, hydraulic hose technique, optimal pump structure technique, and active vibration control technique of Pipeline system.

70 citations

Journal ArticleDOI
TL;DR: In this paper, the damage and fracture mechanism of a nickel-based single crystal superalloy during creep at intermediate temperature was investigated by means of creep properties measurement, microstructure and fracture morphology observation, and the results showed that the deformation mechanism of the alloy is dislocations slipping in the γ matrix and shearing into γ′ phase.
Abstract: By means of creep properties measurement, microstructure and fracture morphology observation, an investigation has been made into the damage and fracture mechanism of a nickel-based single crystal superalloy during creep at intermediate temperature. The results show that the deformation mechanism of the alloy is dislocations slipping in the γ matrix and shearing into γ′ phase, the dislocations shearing into γ′ phase may be decomposed to form the configuration of the partials plus stacking fault and the K–W locking. While in the latter stage of creep, the primary–secondary slipping systems are alternatively activated to shear and twist the cubical γ′/γ phases, which results in the initiation of the micro-crack occurring in the intersection regions of two slip systems. As creep goes on, the micro-cracks are propagated on the (001) plane along 〈110〉 directions. Because the multi-cracks are formed and propagated on the different cross-section of the sample during creep, which may result in the tearing edge or secondary cleavage plane generating at the tip of the cracks along the direction with bigger shearing stress. When the propagating primary cracks on (001) plane intersects with {111} secondary cleavage plane, the propagation of the primary cracks is terminated to form the square-like cleavage plane on the (001) plane. In further, the multi-cracks propagating on the different cross-section are joined by the tearing edge or secondary cleavage plane until the occurrence of creep fracture, this is thought to be the main reason of the creep fracture displaying the uneven and multi-level cleavage features.

41 citations

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TL;DR: In this paper, the fatigue behavior of a welded T-joint subjected to cyclic bending is analyzed and a semi-elliptical surface crack is assumed to exist at the welding.

41 citations

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TL;DR: The experimental results show that only one pressure sensor and one y-axis vibration sensor are needed to achieve 100% fault diagnosis and compared with SVM and GA-BP, the PNN fault diagnosis model has fast convergence, high efficiency and a higher performance and recognition for the typical faults of airborne fuel pump.

34 citations