The effects of carbon and chromium on the block size acicular ferrite (AF) were investigated, focusing cementite formation. Block AF refined with increasing content coarsened content. inverse. did not necessarily become finer yield stress γ-phase driving force γ→α phase transformation. On other hand, became regardless when sympathetic/ autocatalytic nucleation frequency increased increased. Thi...

Cementite (Fe3C) plays a major role in the tribological performance of rail and bearing steels. Nonetheless, current understanding its deformation behavior during wear is limited because it conventionally embedded matrix. Here, we investigate chemical evolution bulk polycrystalline cementite single-pass sliding at contact pressure 31 GPa reciprocating multi-pass 3.3 GPa. The was studied by elec...

Examination of a time–temperature–transformation (TTT) diagram for an eutectoid carbon steel (Fig. 1), bearing in mind the fact that the pearlite reaction is essentially a high temperature one occurring between 550C and 720C and that the formation of the martensite is a low-temperature reaction, reveals that there is a wide range of temperature ∼250–550C within which neither of these phases for...

The term, Materials Genome (a registered trademark of MaterialsGenome, Inc., Pennsylvania, USA) was coined by the present author in 2002 and recently used with consent in the “Materials Genome Initiative” by the White House Office of Science and Technology Policy. In this paper, the author’s perspectives on Materials Genome, i.e. the building blocks of materials, will be illustrated with severa...

This paper describes an automatic system for segmentation and quantification of the microstructures of white cast iron. Mathematical morphology algorithms are used to segment the microstructures in the input images, which are later identified and quantified by an artificial neuronal network. A new computational system was developed because ordinary software could not segment the microstructures...

The hydrogen uptake of five carbon steel wires exposed to a corrosive CO2/H2S environment where protective film formation was not favorable measured. uptakes decreased with the accumulation retained carbide for most materials. It is assumed that adsorbed on carbides at some distance from ferrite will easily diffuse steel, hence giving beneficial effect. This effect observed material lowest cont...

We describe here for the first time the low temperature superplasticity of nanostructured low carbon steel (microalloyed with V, N, Mn, Al, Si, and Ni). Low carbon nanograined/ultrafine-grained (NG/UFG) bulk steel was processed using a combination of cold-rolling and annealing of martensite. The complex microstructure of NG/UFG ferrite and 50-80 nm cementite exhibited high thermal stability at ...