Many steels contain substitutional solutes which have a strong affinity for carbon or nitrogen. Such steels can be hardened by heat treatment which induces the precipitation of fine alloy carbides. Examples of such carbides include MX, 2 73 , 6 and 236 , where M stands for a mixture of iron and substitutional solute atoms and X stands for interstitial solute atoms. In practice, the heat treatme...

The aim of the present study is the prediction of critical conditions (including critical strain and flow stress) for the initiation of dynamic recrystallization during thermo-mechanical processing of plain carbon steels. For this propose, torsion tests were conducted at different temperature (1050, 1100 and 1150˚C) and strain rates (0.002, 0.02 and 0.2/s). All flow curves showed a peak st...

We present a model for the brittle–ductile transition in ferritic steels based on two dimensional discrete dislocation simulations of crack-tip plasticity. The sum of elastic fields of the crack and the emitted dislocations defines an elasto–plastic crack field. Effects of crack-tip blunting of the macrocrack are included in the simulations. The plastic zone characteristics are found to be in a...

High-strength low-to-medium carbon martensitic steel is increasingly used in the automobile industry. This study investigated room temperature aging behavior of as-quenched autotempered Fe-C lath steels (C: 0.07-0.77 mass%) using kinetic analysis hardness change and interrupted atom probe (AP) to clarify dominating factor hardening. Age-hardening at 23 °C was confirmed steels, including low-car...

It has been shown that the main influence on crystallization of heat‑resistant chromium steels is hydrogen. a demodifying element casting structure. The mechanism hydrogen can be explained from position nanostructured alloys. Dissolved atoms, adsorbing elementary nanocrystals iron and in melts steels, prevent combination into nuclei α‑phase microcrystals. As result, castings with an unmodified ...