A5027820568- Microstructure and Mechanical Properties of Steels
- Hydrogen embrittlement and corrosion behaviors in metals
- Metallurgy and Material Forming
- Aluminum Alloy Microstructure Properties
- Metal Alloys Wear and Properties
- Aluminum Alloys Composites Properties
- Nuclear Materials and Properties
- Microstructure and mechanical properties
- High Temperature Alloys and Creep
- Metallurgical Processes and Thermodynamics
- Welding Techniques and Residual Stresses
- Fusion materials and technologies
- Corrosion Behavior and Inhibition
- Metal and Thin Film Mechanics
- Metal Forming Simulation Techniques
- High-Temperature Coating Behaviors
- Non-Destructive Testing Techniques
- Titanium Alloys Microstructure and Properties
- Advanced Welding Techniques Analysis
- Metallurgical and Alloy Processes
- Nuclear reactor physics and engineering
- Concrete Corrosion and Durability
- Recycling and Waste Management Techniques
- Advanced ceramic materials synthesis
- Solidification and crystal growth phenomena
Universidade de São Paulo
2015-2024
Hospital Universitário da Universidade de São Paulo
2021-2022
Universidade Politecnica
2006-2019
Materia (United States)
2007-2017
Microsoft (Brazil)
2015
Universidade Federal de São Carlos
2009
Universidad San Pedro
2008
Association of the Technological Integrated Systems Laboratory
2008
Companhia Brasileira de Aluminio
2008
University of Wales
1999
Austenitic stainless steels are probably the most important class of corrosion resistant metallic materials. In order to attain their good properties they rely essentially on two factors: a high chromium content that is responsible for protective oxide film layer and nickel steel remain austenitic. Thus base composition normally Fe-Cr-Ni alloy. practice situation much more complex with several other elements being present, such as, Mo, Mn, C, N among others. one almost never has single...
The evolution in the understanding of recrystallization phenomena is summarized this paper. Initially main developments concerning are presented from a historical perspective. Definitions and concepts involving regarding it as solid-state reaction that occurs by nucleation growth. mechanisms subsequently discussed. Finally, growth step highlighted, emphasizing boundary sub-boundary mobilities forces acting on high angle grain boundaries sweep microstructure during recrystallization.
This article reviews the phenomena involved during annealing of cold worked austenitic stainless steels. Initially state is discussed, with special emphasis on formation deformation induced martensites. Following, martensite reversion, recovery, recrystallization and grain growth are discussed. The interactions between primary precipitation precipitate dissolution secondary dealt in detail. Finally, textures resulting from hot working, recrystallization, presented.
The present work studies, in a comparative manner, the sigma phase precipitation of three stainless steels: austenitic type 316L (17Cr–12Ni–2·5Mo, wt-%), superferritic DIN W. Nr. 1·4575 (Nb–28Cr–4Ni–2Mo, wt-%) and duplex 1·4462 or UNS S31803 (22Cr–5·5Ni–3Mo–0·14N, wt-%). In steel, formation occurred both at austenite grain boundaries inside delta ferrite islands. interior. ferrites, by eutectoid reaction ferrite→sigma + austenite. tendency towards types steel investigated can be placed...
Mg alloys conventionally rolled often present strong basal textures that affect negatively further deformations, limiting their applications. The research found cross-rolling experiences in adequate conditions can weaken those intense as a result of the interaction deformation mechanisms and dynamic recrystallization. effects rolling temperature strain rate on microstructure texture an AZ31B magnesium alloy sheet generated heterogeneous where initial was strengthened during cold it gradually...
Maraging steels are one of the highest strength commercially available. The new versions known as ultra-high maraging (UHSM) and can offer yield values over 3 GPa. aim this investigation was evaluating electrochemical behavior three non-commercial/laboratory UHSM containing 13Ni–15Co Mo content variations (7.5, 11 15 wt%). were annealed at 1000 °C studied different conditions (non-aged aged 480 for h 6 h). As reference material, a commercial steel (18Ni–9Co–5Mo) heat treated according to...
Solid state reactions taking place during annealing of 20% cold rolled ferrite–austenite duplex stainless steel (DIN W.-Nr: 1.4462) have been studied by means several complementary techniques: optical, scanning and transmission electron microscopy, X-ray diffraction analysis, microhardness ultramicrohardness measurements magnetic phase detection (ferritoscope). It has found that after rolling austenite exhibited more strain hardening a higher driving force for recrystallization than ferrite....
The effects of chemical composition and cooling rate on the delta ferrite formation in austenitic stainless steels have been investigated. Ferrite fractions measured by a magnetic method were range 0 to 12% compared with those calculated empirical formulas available literature. (amount distribution) was strongly affected steel composition, but less rate. Among several used calculate amount ferrite, best agreement obtained proposed independently Schneider Schoefer, latter being recommended...
The influences of the chemical composition and heating rate have been studied in 300 350 maraging steels using dilatometry. For these tests, was carried out with rates 1, 10 28 °C/s. results shown that precipitation mechanism for both materials range is by lattice diffusion. Furthermore, Co Ti contents influence strongly precipitation. diffusion martensite reversion influenced Ni rate. small ( ~1 °C/s) this prevails steel while has a minor importance. mainly shear mechanism. higher (~28 ºC/s) steels.
A determination of stacking fault energy (SFE) the austenite phase a duplex stainless steel, material no. 1.4462, has been carried out using transmission electron microscopy (TEM). Furthermore, cold rolling tests and microstructural analysis have realized in order to allow detailed discussion obtained SFE-values. The results this Investigation indicate that within steel Is lower than those single-phase austenitic steels. This is justified by chemical composition; mainly Cr Ni alloying...
The phenomena of strain hardening, induced martensite formation, recovery, reversion and recrystallization have been studied in austenitic stainless steels the AISI 304L 316L types, after solution annealing, followed by rolling at different temperatures (-196, 25, 100 200°C) subsequent annealing worked samples. Strain hardening percentage α’ formed showed strong dependency with deformation temperature austenite chemical composition. As expected, both as well amount was higher steel for lower...