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Nondestructive Characterization and Evaluation of Embrittlement Kinetics and El...
Vera Lúcia de Araújo Freitas; Paulo G. Normando; Victor Hugo C. de Albuquerque; Edgard de Macedo Silva; Antonio Almeida Silva; João Manuel R. S. TavaresIn this work, an experimental study was carried out to evaluate the potential of the ultrasonic technique, with ultrasonic velocity and attenuation measurements, to assess the heat aging effects on duplex stainless steel SAF 2205, at temperatures of 425 ºC and 475 ºC for time periods of 12 h, 24 h, 50 h, 100 h and 200 h, as well as in the as received state of the material. Velocity measurements were calculated ...
Nondestructive characterization of microstructures and determination of elastic...
Vera Lúcia de Araújo Freitas; Victor Hugo C. de Albuquerque; Edgard de Macedo Silva; Antonio Almeida Silva; João Manuel Ribeiro da Silva TavaresThis paper presents a reliable and fast nondestructive characterization of microstructural and elastic properties of plain carbon steel, based on ultrasonic measurements for ultrasonic velocity and attenuation. Microstructures considered are: ferrite, pearlite, ferrite-pearlite and martensite. Ultrasonic velocities considered longitudinal and transverse waves and modulus of elasticity and modulus of shear were ...
Spinodal decomposition mechanism study on the duplex stainless steel UNS S31803...
Victor Hugo C. de Albuquerque; Edgard de Macedo Silva; Josinaldo Pereira Leite; Elineudo Pinho de Moura; Vera Lúcia de Araújo FreitasThis work, focuses on the spinodal decomposition mechanism study on the duplex stainless steel duplex USN S31803, composed by austenite (γ) and ferrite (α) phases, at 425ºC and 475oC temperatures by ultrasonic speed measurements. This temperature range is responsible for the transformation mechanism of αinitial phase to α phases (poor in chromium) and α’ (rich in chromium) by spin...
Phase transformations evaluation on a UNS S31803 duplex stainless steel based o...
Edgard de Macedo Silva; Victor Hugo Costa de Albuquerque; Josinaldo Pereira Leite; Antonio Carlos Gomes Varela; Elineudo Pinho de MouraDuplex stainless steel presents special mechanical properties such as, for example, mechanical and corrosion strength, becoming competitive in relation to the other types of stainless steel. One of the great problems of duplex stainless steel microstructural changes study is related to embrittlement above 300ºC, with the precipitation of the ’ phase occurring over the ferritic microstructure. Aimi...
Microstructural characterization of carbon steels using ultrasonic velocity mea...
Vera Lúcia de Araújo Freitas; Antonio Almeida Silva; Edgard de Macedo Silva; Victor Hugo C. de Albuquerque; João Manuel Ribeiro da Silva TavaresNon-destructive techniques are suitable alternatives for analysis and microstructural characterization of steels’ phases. Based on this, this work aims to analyze the behavior of longitudinal and transverse ultrasonic velocities in three different types of AISI steels: 1006, 1080 and quenched 1045. These materials were selected due to their distinct microstructures: ferrite, pearlite and martensite, respe...
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