Carbide-free bainite in medium carbon steel

Effect of austenite grain size on the transformation kinetics of upper and lower bainite in a low-alloy steel

Low temperature kinetics of bainite formation in high carbon steels

The effect of prior ferrite formation on bainite and martensite transformation kinetics in advanced high-strength steels

Analyzing the scale of the bainitic ferrite plates by XRD, SEM and TEM

Bainite is of considerable importance in the design of high strength steels. There are two types of morphologies, upper and lower bainite. In upper bainite, cementite forms between adjacent bainitic ferrite plates. In certain steels, however, the cementite reaction is suppressed so that carbon-enriched austenite remains untransformed between bainitic ferrite plates. In lower bainite, cementite also has the opportunity to precipitate within bainitic ferrite plates. In order to model the development of these microstructures, it is necessary to treat the simultaneous formation of both the ferritic and carbide components of the microstructure. A theory has been developed to do exactly this, enabling the estimation of the phase fractions, the cementite particle size and the transition from upper to lower bainite. The results have been compared against experimental data.

Modelling Upper and Lower Bainite Trasformation in Steels

Micro-electrochemical investigation on the role of Mg in sacrificial corrosion protection of 55mass%Al-Zn-Mg coated steel

Pre-painted hot-dip 55 mass% Al–Zn alloy coated (galvalume) steels are widely used as architectural and automotive materials due to their high weatherability in atmospheric environments. The high durability of pre-painted galvalume steels is derived from the sacrificial protection of steel by the Al–Zn coating layer, and anti-corrosive pigments are added to the primer layers to improve the delamination of the organic paint. Strontium chromate (SrCrO4) is typical of such anti-corrosive pigments, and effective against filiform corrosion on pre-painted steels at cut edges and coating defects.1–4) However, due to concerns regarding the toxicity of chromium (VI)-containing compounds, the use of SrCrO4 has been restricted,5) and the search for an alternative to chromate base pigments has been extensive.1,6–14) Phosphate pigments are traditional and promising alterEffect of Phosphate and Chromate Pigments on Sacrificial Corrosion Protection by Al–Zn Coating and Delamination Mechanism of Pre-painted Galvalume Steel

Effect of Phosphate and Chromate Pigments on Sacrificial Corrosion Protection by Al–Zn Coating and Delamination Mechanism of Pre-painted Galvalume Steel

Michiyasu Takahashi

Papers

Modelling Upper and Lower Bainite Trasformation in Steels

Micro-electrochemical investigation on the role of Mg in sacrificial corrosion protection of 55mass%Al-Zn-Mg coated steel

Effect of Phosphate and Chromate Pigments on Sacrificial Corrosion Protection by Al–Zn Coating and Delamination Mechanism of Pre-painted Galvalume Steel