51 documents found, page 1 of 6
Application of low Ms temperature consumable to dissimilar welded joint
Saraiva, Daniel Lucena; Béreš, Miloslav; Silva, Cleiton Carvalho; Nunes, Cristiana dos Santos; Silva, Jean Jefferson Moraes daThe welding of dissimilar joints is very common in systems used in oil exploration and production in deep sea waters. Commonly involves welding of low carbon steel pipes with low alloy steel forgings both with inner Inconel clad. The forged steel part undergoes a process of buttering with Inconel or carbon steel electrode before the weld of the joint. The buttering process is followed by a process of residual s...
An assessment of biomedical CoCrMo alloy fabricated by direct metal laser sinte...
Girão, Daniel de Castro; Béreš, Miloslav; Jardini, André Luiz; Maciel Filho, Rubens; Silva, Cleiton Carvalho; Siervo, Abner deCoCrMo alloys have been used for several decades in implantable devices due to their favourable mechanical properties, low wear rate in addition to good biocompatibility and high corrosion resistance. These alloys are conventionally produced via casting and/or forging route, however additive manufacturing techniques being recently employed in their fabrication. In this work, CoCrMo samples were produced by dire...
Utilização do equipamento de ensaio epr-dl de campo na detecção de fase sigma u...
Barreto, Abraão Danilo Gomes; Andrade, Tathiane Caminha; Silva, Cleiton Carvalho; Miranda, Hélio Cordeiro deThis work has objective to correlate the intergranular corrosion susceptibility test named EPR-DL (Electrochemical Potentiokinetic Reactivation of Double Loop) with the sigma phase formation and other phases. It has been used samples from a UNS S32760 steel pipe for conducting various aging heat treatments. Held isothermal heat treatment at 850°C for 1 min, 10 min, 30 min, 1 h, 1h30min and 10 h. Each heat treat...
Kinetics of reverted austenite in 18 wt.% Ni Grade 300 Maraging steel: an in-si...
Santos, Luis Paulo Mourão dos; Béreš, Miloslav; Castro, Mirela Oliveira de; Sarvezuk, Paulo Willian Carvalho; Wu, LeonardoIn this study, we investigated the transformation kinetics of martensite fi reverted austenite in 18 wt.% grade 300 Ni maraging steel. The kinetics was evaluated based on the in situ synchrotron x-ray diffraction data collected during isothermal heat treatment at 570C. The onset of transformation martensite fi reverted austenite was detected after 5 min of aging. The austenite fraction increased as a function o...
Kinetics of Reverted Austenite in 18 wt.% Ni Grade 300 Maraging Steel: An In-Si...
Santos, Luis Paulo Mourão dos; Béreš, Miloslav; Castro, Mirela Oliveira de; Sarvezuk, Paulo Willian Carvalho; Wu, LeonardoIn this study, we investigated the transformation kinetics of martensite → reverted austenite in 18 wt.% grade 300 Ni maraging steel. The kinetics was evaluated based on the in situ synchrotron x-ray diffraction data collected during isothermal heat treatment at 570°C. The onset of transformation martensite → reverted austenite was detected after ~ 5 min of aging. The austenite fraction increased as a function ...
Intergranular corrosion evaluation of friction stir welded AISI 410S ferritic s...
Caetano, Gerbson de Queiroz; Silva, Cleiton Carvalho; Motta, Marcelo Ferreira; Farias, Jesualdo Pereira; Bergmann, Luciano Andrei; Santos, Jorge F. dosThis study aimed to investigate the susceptibility of AISI 410S ferritic stainless steel to intergranular corrosion when friction stir welded (FSW) using the double-loop electrochemical potentiokinetic reactivation (DL-EPR) test. The highest values obtained for the ratio between the reactivation current (Ir) and the activation current (Ia) were found at the top of the advancing side for the two conditions teste...
Mechanical Properties and Microstructural Characterization of Aged Nickel-based...
Silva, Cleiton Carvalho; Albuquerque, Victor Hugo Costa de; Miná, Émerson Mendonça; Moura, Elineudo Pinho de; Tavares, João Manuel R.S.The aim of this work was to evaluate the different phases formed during solidification and after thermal aging of the as-welded 625 nickel-based alloy, as well as the influence of microstructural changes on the mechanical properties. The experiments addressed aging temperatures of 650 and 950 C for 10, 100, and 200 hours. The samples were analyzed by electron microscopy, microanalysis, and X-ray diffraction in ...
Effect of different thermomechanical processes on the microstructure, texture, ...
Masoumi, Mohammad; Echeverri, Edwan Anderson Ariza; Silva, Cleiton Carvalho; Béreš, Miloslav; Abreu, Hamilton Ferreira Gomes deA commercial API 5L X70 steel plate was subjected to different thermomechanical processes to propose a novel thermomechanical rolling path to achieve improved mechanical properties. Scanning electron microscopy, electron backscatter diffraction, and x-ray texture analysis were employed for microstructural characterization. The results showed that strain-free recrystallized {001} ferrite grains that developed at...
Influence of rotation speed and axial force on the friction stir welding of AIS...
Caetano, Gerbson de Queiroz; Silva, Cleiton Carvalho; Motta, Marcelo Ferreira; Miranda, Hélio Cordeiro de; Farias, Jesualdo PereiraThe Friction Stir Welding process parameters were varied to provide a combination of an acceptable surface finish, absence of cracks, and full tool penetration. Two levels of rotation speed and axial forces from 10 to 30 kN were applied, whilst keeping the welding speed constant at 1 mm/s. One of the defects analyzed was the production of flashes. This can occur due to an increase in axial force and because of ...
Improvement of formability and tensile mechanical properties of SAE 970X steel ...
Masoumi, Mohammad; Echeverri, Edwan Anderson Ariza; Silva, Cleiton Carvalho; Aguiar, Willys Machado; Abreu, Hamilton Ferreira Gomes deIt is believed that texture, as the preferred crystallographic orientation of microstructural features, causes plastic anisotropy, leading to a decrease in formability. Thus, promoting recrystallization and randomizing crystallographic texture have been the main methods of increasing formability. The aim of the current study was to improve the tensile properties and formability by means of controlling the micro...