The microstructure of a steel is often developed by solid-state transformation from austenite. The major transformation products are allotriomorphic ferrite, pearlite, Widmanstätten ferrite, bainite and martensite, differentiated by morphological features, and their nucleation and growth mechanisms. A steel often consists of several phases as a result of dynamic evolution during continuous cool...

Isothermal transformation characteristics of a medium carbon Ti-V microalloyed steel were investigated using light microscopy, scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS), and by uniaxial compressive testing. Samples austenitized on 1100 °C isothermally treated in the range from 350 to 600 subsequently water quenched. The final microstructure samples he...

Abstract Isothermal bainitic transformation of a lean medium-Mn steel containing (in mass%) 0.18C–3.6Mn–1.7Al–0.23Si–0.2Mo–0.04–Nb after full austenitization at 1100 ºC was studied by means high resolution dilatometry. The effects isothermal holding temperatures ranging from 450 to 350 °C on the kinetics experimentally characterizing microstructure present time 15 min 2 h. obtained results show...

Due to the moderate formability of low alloy high strength steels, (TRIP) steels called "transformation induced plasticity" have been developed. They are especially used in production automobile shock absorbers and beam supporting parts. The microstructure these consists distribution ferrite, bainite (5 - 10%) residual austenite phases matrix. generally provided by structure. During shaping, tu...

The purpose of this study was to determine how the mechanical properties and microstructure formed on low alloy steel (tooth bucket) heated at temperatures 850 ⁰C then held for 15 minutes after that it cooled with oil. material hardening process carried out by testing Vickers hardness, impact, observing using an optical microscope 200x magnification. Hardness values obtained from heat treatment...

Microalloyed steels have a maximum of 2% in alloying elements and are used the automotive petrochemical industries. The microstructure mechanical properties these depend on chemical composition, processing addition molybdenum, niobium, titanium vanadium. To evaluate molybdenum effect properties, two microalloyed steels, with similar levels vanadium, were prepared forged. 0.056 0.160 percent by ...

Ausforming treatments at different temperatures were applied to a medium CSi rich carbide free bainitic steel, and the role of transformation plasticity on evolution microstructure is discussed. Three ausforming selected prior isothermal bainite 325 °C. Deformation was above start temperature, BS, (600 °C), below BS (400 temperature (325 °C). A combination high-resolution dilatometry, XRD, SEM,...

A combination of experimental and numerical approaches was applied for constructing a dynamic model thermomechanical processing, which used simulating laboratory rolling cooling, designing cooling path to enable phase transformation from austenite ultrafine ( ∼ 50–100 nm) bainitic laths. Physical simulation experiments were calibrating the models. Hot water conducted they numerically simulated....

A 1 GPa class weld metal was prepared by multi-pass welding using a prototype flux-cored wire, and the correlation between microstructure low-temperature impact toughness of investigated. The as-deposited columnar region equiaxed reheated subsequent passes observed, it found that transformation products such as bainite martensite mainly developed in both regions. Since prior austenite grains we...