In this work, the damage behavior of cold-rolled zinc-coated dual-phase steel sheets 600 and 800 grades was evaluated by means standard uniaxial tensile testing, microstructural characterization finite element modeling. The void formation in both steels investigated as a function plastic strain level from digital image processing scanning electron micrographs to quantify average size determine corresponding measures density, area fraction aspect ratio. Based on analysis experimental test...

The microstructural alterations suffered during the process of drawing deformation and subsequent annealing pearlitic steel wires, were evaluated by scanning electron microscopy atomic force microscopy. deformed material showed curling structure in cross section while, longitudinal section, lamellae was aligned with direction. characterization samples also allowed observing an interlamellar spacing reduction intermediate alignment process. After heat treatment at 1000ºC for 5 min...

There are many studies on austenitic stainless steels with transformation induced plasticity (TRIP). Basically, in these steels, there is a significant increase strength and toughness the of austenite to martensite. 304L steel finds extensive application industry. Studies relating martensitic plastic deformation quite common. Many involve monotonic loading martensite formed. In practice, subject distinct types possibly stress concentrators. Thus, also smaller quantities, it possible find...

In this work, the plastic behavior of cold-rolled zinc coated dual-phase steel sheets DP600 and DP800 grades is firstly investigated by means uniaxial tensile Forming Limit Curve (FLC) testing. The tests were carried out at 0 o , 45 90 angular orientations with respect to rolling direction evaluate mechanical properties anisotropy Lankford r-values. forming limit strains are defined according Nakajima’s procedure. Thickness measurements tested samples cut perpendicular fracture allowed...

Austempered ductile cast irons (ADI) have received great attention in last years because their combined properties of good ductility, high strength and fracture toughness, fatigue strength, wear low production cost. Such combination can be reached microstructures consist a mixture acicular ferrite (bainite), residual austenite with carbon content nodular graphite. In this work, the effect austempering heat treatment on microstructure commercial alloy to produce three different grades ADI,...

This work aimed to analyze the damage behavior of cold rolled TRIP780 steel sheet submitted interrupted uniaxial tensile tests performed along rolling direction. The formation voids is investigated as a function straining level using digital image analysis scanning electron micrographs obtain measures void density, area fraction, aspect ratio and mean size. volume fractions both ferrite/martensite retained austenite constituents were obtained from X-ray diffraction measurements. An abruptly...

An IF steel billet was deformed via equal channel angular pressing (ECAP) using a single pass at room temperature. Grain refinement observed in the microstructure after severe plastic deformation. Regular deformation bands arise several grains as result of grain fragmentation during pressing. The hardness profile shows an extended homogeneity region within area due to tooling (bend radius) employed

The limit strains of dual-phase steels DP600 and 800 were evaluated in this work with a localization model formulated plane-stress conditions using elasto-plastic constitutive equations. In model, geometrical imperfection parameter is defined from the sheet nominal thickness, initial ferrite grain size average surface roughness. proposed identification procedure provided more physically meaning for at best conservative predictions drawing Forming Limit Curve (FLC) range both investigated...

Dual-phase steels offer very attractive combinations of strength and ductility owing to the coexistence different microstructures components their interactions. These are suitable automotive industry due improved impact resistance increasing passenger safety along with vehicle weight reduction. The properties dual-phase attributed chemical composition, type, size, amount spatial distribution phases that can be obtained during thermomechanical treatments, namely, ferrite martensite. In this...

Abstract: A well-known challenge is to predict the transformations occurring during metal alloys welding aiming control weldment properties. Thus, this study presents a Thermo-Mechanical-Metallurgical model numerically thermal history, solid-state phase transformations, solidification microstructure and hardness distribution after of high strength low-alloy steels. The was implemented in an in-house computational code based on Finite Volume Method, which allowed dynamically track calculate...

Anais do Simpósio de Engenharia Metalúrgica e Materiais Sul Fluminense (978-65-5941-775-9) - Análise Da Transformação Martensítica De Um Aço Inoxidável Austenítico Aisi 304L Após Ser Submetido A Fadiga Baixo Ciclo

The increasing demand for new technologies in the ironmaking/steelmaking field has been motivating several studies towards pelletizing process improvement. Within this context, evaluate reduction of iron ore pellets using dilatometer technique constitutes a promising approach optimizing process. This paper aims metallurgical characterization through sintering particles pellets. With purpose, some experimental procedures are concern as follows. Firstly, kinetic densification is measured...

Friction Stir Welding (FSW) promotes the joining of sheets due to localized plastic deformation and heating by displacing a non-consumable tool. This work aimed verify influence an annealing heat treatment performed at 300 500 ºC with 15 minutes soaking times, before after FSW 7475-T7351 aluminum alloy. The macrographs welded joint (top cross section) micrographs section was obtained stereoscope optical microscope were analyzed mechanical behavior characterized uniaxial tensile tests. It...