A5013268509- Microstructure and Mechanical Properties of Steels
- Metallurgy and Material Forming
- Metal Alloys Wear and Properties
- Microstructure and mechanical properties
- Magnetic Properties and Applications
- Hydrogen embrittlement and corrosion behaviors in metals
- Metal and Thin Film Mechanics
- High Temperature Alloys and Creep
- Corrosion Behavior and Inhibition
- Welding Techniques and Residual Stresses
- Metal Forming Simulation Techniques
- Advanced machining processes and optimization
- Advanced ceramic materials synthesis
- Aluminum Alloy Microstructure Properties
- Shape Memory Alloy Transformations
- Titanium Alloys Microstructure and Properties
- Adhesion, Friction, and Surface Interactions
- Aluminum Alloys Composites Properties
- Material Properties and Applications
Centro de Estudios e Investigaciones Técnicas de Gipuzkoa
2000-2024
Universidad de Navarra
2009-2024
The present paper reports the results of a blind round robin test dedicated to measurement retained austenite content different TRIP assisted multiphase steels. Various surface and volume techniques, i.e. light microscopy, X-ray diffraction, electron backscattered diffraction (EBSD), magnetic saturation, thermal diffusivity laser ultrasonics, were used by partners. compiled show quite large variability estimated content, particularly for well established such as (XRD) magnetisation. On other...
Multipass torsion tests were carried on with several V-microalloyed high carbon steels, using different deformation sequences in order to modify the austenite state prior transformation. Both recrystallized and deformed microstructures studied. After deformation, cooling rates applied. The results show that accumulating strain before transformation seems slightly increase interlamellar spacing for a given rate, this being related pearlite taking place at higher temperatures because of grain...
Multipass torsion tests were carried out with two eutectoid steels, one microalloyed vanadium, using different deformation sequences. The aim of the study was to investigate potency vanadium in retardation recrystallization for accumulating strain austenite. showed that at certain conditions well defined non-recrystallization temperatures (Tnr) observed steel. As a consequence, an increase austenite grain boundary area per unit volume (SV) obtained which led refinement "ferrite unit" size pearlite.
Carbide-free bainitic (CFB) steels belong to the family of advanced high strength (AHSS) that are struggling become part third-generation be marketed for automotive industry. The combined effects matrix and retained austenite confers a significant with remarkable ductility these steels. However, CFB usually show much more complex microstructures also contain MA (Martensite–Austenite) phase auto-tempered martensite (ATM). These phases may compromise present work analyzes substructure...
Abstract The microstructure evolution of 55VNb microalloyed steel during warm deformation via single pass uniaxial compression was researched, and the effect conditions on dynamic spheroidisation cementite lamellae ferrite conditioning for a range temperatures (600 °C to 700 °C) strain rates (1 10 s −1 ) analysed. Cementite appear subdivide irrespective temperature with phase penetrating pattern formed by crystallites, in turn confirming that dissolution this is an important mechanism...
Nb is added to C-Mn steels in order use the solute drag and/or strain induced precipitation as a useful tool condition austenite hot rolling mill and produce during subsequent cooling refined ferrite grain size. The highest degree of refinement obtained conventional mills by accumulating deformation last passes, followed early run out table high density nucleated grains. However, maximum certain extent attenuated due coarsening taking place transformation. present work analyses different...
This paper analyses the application of vanadium microaddition for production high strength 16mm diameter wire-rods. Laboratory trials, simulating industrial cooling conditions after hot rolling, were made in a range between 3 and 8°C/s. The results show that introducing means it is possible to optimise chemical composition by reducing elements susceptible segregation. Besides, values are maintained precipitation hardening. influence microalloying on crystallographic ferrite unit size was...
Due to the increased complexity of steel microstructures, when considering application available Hall-Petch type equations for yield strength prediction, a number difficulties raises. For example, correlation between grain size measurements by EBSD technique and optical microscopy (OP) in complex microstructures is required order integrate data traditional developed OP results ferrite-pearlite microstructures. Besides, introduction some additional terms account precipitation, C solution...
42CrMo4-type steel grades are widely used in a great variety of components that require ad hoc mechanical properties. However, due to the dimensions large and previous thermomechanical treatments, presence heterogeneities chemical compositions expected impact those In present work, detailed analysis phase transformation behavior upon cooling was carried out through dilatometry test on samples 42CrMo4 belonging component has non-homogeneous distribution. The dilatation signals quantitative...
A combination of monotonic and reverse tests has been carried out in order to assess the strain path effects on an austenitic stainless steel hot deformed by torsion. Microstructural results have obtained EBSD. The misorientation average parameter measured at different step size scans, Kernel orientation spread parameter, provide a picture in-grain curvature developed during paths. show that these parameters are sensitive path.