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Thermodynamic stacking fault energy, chemical composition, and microstructure r...
Ribamar, Giovani Gonçalves; Andrade, Tathiane Caminha; Miranda, Hélio Cordeiro de; Abreu, Hamilton Ferreira Gomes deStacking fault energy (SFE) is related to activating complex high strength and ductility mechanisms such as transformation-induced plasticity and twinning-induced plasticity effects. This type of energy can be estimated by many different methods and its importance is in its ability to predict microstructure and phase transformation behavior when the material is submitted to stress/strain. In order to study the ...
Estudo de procedimentos de soldagem MIG/MAG para aplicação de revestimentos de ...
Cavalcante, Nathália Escóssio; Andrade, Tathiane Caminha; Pinheiro, Pedro Helton Magalhães; Miranda, Hélio Cordeiro de; Motta, Marcelo FerreiraThis work aims to study welding techniques applied to repair of components made of ASTM A387 Gr.11 steel, widely used in the oil and gas industry. Due to the working conditions it is needed use materials having good strength and corrosion resistance. UNS N06625 Ni-based alloy (Inconel 625) was used as the filler metal. MIG / MAG welding process was used to apply the temper bead welding technique with two layers...
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...
Deformation-induced martensitic transformation in Co-28Cr-6Mo alloy produced by...
Antunes, Luiz Henrique Martinez; Quintero, John Jairo Hoyos; Andrade, Tathiane Caminha; Sarvezuk, Paulo Willian Carvalho; Wu, Leonardo; Ávila, J.A.The wear resistance of the biomedical low-carbon Co-28Cr-6Mo (wt.-%) alloy is primarily determined by the onset and magnitude of the face-centered cubic to hexagonal close-packed deformation-induced martensitic phase transformation. In metal-on-metal joint bearings, local plastic deformation occurs on the surface and in the subsurface regions. This can cause deformation-assisted structural changes in the materi...
Study of the relationship between stacking fault energy and microstructure in d...
Ribamar, Giovani Gonçalves; Andrade, Tathiane Caminha; Miranda, Hélio Cordeiro de; Abreu, Hamilton Ferreira Gomes deThe properties of high manganese steels are usually related to the mechanism of austenite deformation, either martensite or twin formation during deformation. This deformation mechanism is often related to the stacking fault energy (SFE) that the material possesses. Studies show that SFE values between 0 and 8 mJ/m² provide formation of ε martensite during deformation, whereas only twins are formed for energies...
Microestrutura de uma solda dissimilar entre o aço inoxidável ferrítico AISI 41...
Andrade, Tathiane Caminha; Silva, Cleiton Carvalho; Miranda, Hélio Cordeiro de; Motta, Marcelo Ferreira; Farias, Jesualdo PereiraThis study aims to investigate the microstructure formed in dissimilar welding between AISI 410S ferritic stainless steel and AISI 304L austenitic stainless steels plates by friction stir welding process. The welding was performed setting the following parameters: rotation 450 rpm; welding speed of 1.0 mm/s; and axial force 40 kN. The AISI 410S was positioned on the advancing side while the AISI 304L steel was ...
Detecção de fases deletérias no aço inoxidável superduplex UNS S32760 (Zeron 10...
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 (Electrochemical Potentiokinetic Reactivation) with the sigma phase formation and other phases. It has been used samples from a steel pipe UNS 32760 for conducting various aging heat treatments. Held isothermal treatment at 850°C for 1 min, 10 min, 30 min, 1 h, 1h 30 min and 10 h. Each treated sample as received were ...
Estudo e desenvolvimento de método de seleção de variantes cristalográficas na ...
Andrade, Tathiane CaminhaPolycrystalline materials exhibit a property known as crystallographic texture. It is defined as the preferred orientation of the crystals of a material. Textured materials display other properties, such as mechanical, electrical and magnetic qualities, that may vary along with the orientation. The orientation relationship between phases is also an important property to be investigated, which can be done throug...
Utilização do equipamento de ensaio EPR-DL de campo na detecção de fase sigma
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...
Desenvolvimento e análise de técnicas de soldagem de reparos com deposição em d...
Andrade, Tathiane CaminhaThe right choice of welding processes and parameters for a specification of a welding procedure for the manufacture or repair is an essential factor and can represent the success or the failure of overlay metallic components. Depending on the application, it is necessary that the material and also the weld region have suitable specific properties for requests from operating conditions of these components such a...