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Prosanta Biswas,Surajit Patra,Himadri Roy,Chandra Sekhar Tiwary,Manas Paliwal,Manas Kumar Mondal 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.6
Effect of manganese (Mn) addition (0.0, 1.0, 2.0 and 3 wt%) on the microstructural morphology, hardness, tensile propertiesand fracture behaviour of the gravity cast eutectic Al–12.6Si alloy has been studied through XRD analysis, chemical analysis,optical metallography, FESEM analysis, energy dispersive spectroscopy analysis, hardness test, tensile test and quantitativephase analysis. As-cast Al–12.6Si–0.0Mn alloy has a non-uniformly distributed coarser and irregular shape primary andeutectic silicon particles inside the α-Al phase, and both the Si phase have very sharp corners. Whereas, the 1 wt% Mn addedalloy has uniformly distributed fine eutectic and primary Si particles with blunt corners. Further, the addition of 1.0 wt% Mnforms very few (0.26 vol %) irregular shape Al15(MnFe)3Si2 intermetallic phase within the α-Al phase and eutectic Si phase. But, 2.0 wt% and 3 wt% Mn added alloy has an irregular shape coarse plate-like Al15(MnFe)3Si2 intermetallic phase besidesthe primary and eutectic Si phase. The bulk hardness of the Al–12.6Si alloy is increased with an increase in Mn concentrationas the harder Al15(MnFe)3Si2 intermetallic phase forms and both the Si phase morphology modify. The microhardness ofthe constituent phases also varies with the change in Mn concentration in the alloy. The Mn addition improved the ultimatetensile strength, yield strength, and elongation (%) of the alloy. However, fractographs reveal that the brittle mode of fracturehas been increased due to the presence of a higher volume of brittle Al15(MnFe)3Si2 intermetallic in 2.0 and 3.0% Mn alloy. On the other hand, the amount of brittle and cleavage fracture of Si particles decreased, and ductile fracture with dimplesformation increased in 1.0 wt%Mn added alloy.
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Online Monitoring and Prognostics for Passive Components in Nuclear Power Plants
Ramuhalli, Pradeep,Roy, Surajit,Chai, Jangbom AMERICAN NUCLEAR SOCIETY 2016 Nuclear science and engineering Vol.182 No.2
<P>This paper describes research toward developing prognostics technologies for light water nuclear power reactor components. The focus of this paper is on passive components (those that do not need to change state or move to perform their function), although the technologies are applicable to other classes of components as well. A prototypic failure mechanism (high-cycle fatigue) is used to focus the efforts and provide context for the development effort. A Bayesian framework is proposed for the prognostics of remaining useful life and applied to simulated data sets representing nondestructive measurements of high-cycle fatigue damage. The initial results of the prognostics based on simulated data sets are presented.</P>
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Gerges Dib,Surajit Roy,Pradeep Ramuhalli,채장범 한국원자력학회 2019 Nuclear Engineering and Technology Vol.51 No.3
Second harmonic generation using nonlinear ultrasonic waves have been shown to be an early indicatorof possible fatigue damage in nuclear power plant components. This technique relies on measuringamplitudes, making it highly susceptible to variations in transducer coupling and instrumentation. Thispaper proposes an experimental procedure for in-situ surface wave nonlinear ultrasound measurementson specimen with permanently mounted transducers under high cycle fatigue loading without interruptingthe experiment. It allows continuous monitoring and minimizes variation due to transducercoupling. Moreover, relations describing the effects of the measurement system nonlinearity includingthe effects of the material transfer function on the measured nonlinearity parameter are derived. An insituhigh cycle fatigue test was conducted using two 304 stainless steel specimens with two differentexcitation frequencies. A comprehensive analysis of the nonlinear sources, which result in variations inthe measured nonlinearity parameters, was performed and the effects of the system nonlinearities areexplained and identified. In both specimens, monotonic trend was observed in nonlinear parameterwhen the value of fundamental amplitude was not changing.
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