Novel magnetically induced healing in road pavements

Giustozzi, Filippo

doi:10.1016/b978-0-12-818981-8.00012-6

Cited by 3 publications

(2 citation statements)

References 19 publications

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“…The change of heating rate from 1000°C/s to 100°C/s occurs at the Curie temperature, which is above the equilibrium A 1 temperature. Above the Curie temperature, the paramagnetic transition involves a change in the magnetism of BCC iron, thereby influencing the heating mechanism and heat transport [20]. Therefore, the sample heated at 1000°C/s to the Curie temperature, which exceeds the equilibrium A 1 temperature, should display a shift in the onset of austenite formation more pronounced than the sample heated at 100°C/s [21].…”

Section: Discussionmentioning

confidence: 99%

Application of ultrafast heating and tempering to plate steel

Carreno-Saavedra

Ros-Yanez

García

et al. 2023

Materials Science and Technology

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The microstructure and tensile properties were studied in a low-alloy steel plate treated under ultra-fast heating, quenching, and tempering. The microstructure after heat-treatments was predominantly martensite, with low fraction of bainite and ferrite. The tensile tests showed a 100 MPa improvement in strength and a doubling of the total elongation with the increase in heating rate. The tempering process considerably enhanced the ductility from 1–4% to up to 14% in the samples treated at fast heating rates..Furthermore, the work hardening capacity of ultra-fast heated steel was superior compared to steel treated under conventional quenching and tempering. The results suggest that the tempering stage after ultra-fast heat-treatments and quenching further improves the properties compared to the standard quenched and tempered condition.

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Section: Discussionmentioning

confidence: 99%

Application of ultrafast heating and tempering to plate steel

Carreno-Saavedra

Ros-Yanez

García

et al. 2023

Materials Science and Technology

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“…Equivalent to any other electrical current, eddy current also demands an undisturbed electrical path. So, any voltage drop occurring associated with eddy current is converted into heat energy [482] in accordance with the Joule's law of heating which implies H = I 2 Rt, where H, I, R and t denote the heat energy, electric current, electric resistance and time respectively and a schematic representation of induction melting reaction is presented in figure 18(b) [479]. In many cases, the elements in stoichiometric ratio were induction melted in a boron nitride coated graphite crucible or boron nitride crucible followed by evacuating and filling with argon gas in a stainless steel made closed chamber, whereas in other cases, melting was carried out for stoichiometrically weighed elements sealed in noble gas filled/vacuumized, sealed quartz ampoule.…”

Section: Induction Meltingmentioning

confidence: 99%

Physics and technology of thermoelectric materials and devices

Dadhich

Saminathan

Kumari

et al. 2023

J. Phys. D: Appl. Phys.

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The continuous depletion of fossil fuels and the increasing demand for eco-friendly and sustainable energy sources have prompted researchers to look for alternative energy sources. The loss of thermal energy in heat engines (100-350 ºC), coal-based thermal plants (150-700 ºC), heated water pumping in the geothermal process (150-700 ºC), and burning of petrol in the automobiles (150-250 ºC) in form of untapped waste-heat can be directly and/or reversibly converted into usable electricity by means of charge carriers (electrons or holes) as moving fluids using thermoelectric (TE) technology, which works based on typical Seebeck effect. The enhancement in TE conversion efficiency has been a key challenge because of the coupled relation between thermal and electrical transport of charge carriers in a given material. In this review, we have deliberated the physical concepts governing the materials to device performance as well as key challenges for enhancing the TE performance. Moreover, the role of crystal structure in the form of chemical bonding, crystal symmetry, order-disorder and phase transition on charge carrier transport in the material has been explored. Further, this review has also emphasized some insights on various approaches employed recently to improve the TE performance, such as, (i). carrier engineering via band engineering, low dimensional effects, and energy filtering effects and (ii). Phonon engineering via doping/alloying, nano-structuring, embedding secondary phases in the matrix and microstructural engineering. Wehave also briefed the importance of magnetic elements on thermoelectric properties of the selected materials and spin Seebeck effect. Furthermore, the design and fabrication of TE modules and their major challenges are also discussed. As, thermoelectric figure of merit, zT does not have any theoretical limitation, an ideal high performance thermoelectric device should consist of low-cost, eco-friendly, efficient, n- or p-type materials that operate at wide- temperature range and similar coefficients of thermal expansion, suitable contact materials, less electrical/ thermal losses and constant source of thermal energy. Overall, this review provides the recent physical concepts adopted and fabrication procedures of TE materials and device so as to improve the fundamental understanding and to develop a promising TE device.

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