Impact testing methodology is findings the applications for determining the impact strength of the different materials. Oneof the most important characteristics of structural steels, toughness is assessed by the Charpy V-notch impact test. The objective of the research was to maximize the impact toughness by selecting various combinations of Charpy Impact test parameters. In this paper, experim...

Abstract The thermal and mechanical stabilities of retained austenite in aluminum-containing medium-Mn 0.16C–4.7Mn–1.6Al–0.2Si sheet steel were investigated. strain-induced martensitic transformation Mn TRIP was studied at different temperatures. Static tensile tests carried out the temperature ranging from ? 60 to 200 °C. allowed study influence on austenite-to-martensite kinetics. interrupted...

This study investigated the microstructures of pearlite and martensite transformed from ultrafine-grained austenite in 0.45C steel and Vadded 0.45C steel. The mean prior austenite grain sizes were refined to be 4.5 μm in the 0.45C specimen and 2.4 μm in the V-added 0.45C specimen through cyclic heat treatment of austenitizing and water quenching, i.e., repetition of martensite § austenite trans...

To investigate the microstructure and damage of friction-fatigued carburized martensitic steels for reliability remanufacturing parts, retained austenite (γ) phase residual stress were characterized by X-ray diffraction (XRD) scanning electron microscopy (SEM). We evaluated their changes before after roller pitching tests, operation gear parts.

The effect of austenite deformation on carbon partitioning and transformation to athermal isothermal martensite, bainite during quenching (QP) is described for three steel compositions: Fe-0.3C-0.6Si-1.1Al, Fe-0.3C-1.0Si Fe-0.3C-0.5Si-0.5Al. Microstructures were characterized using SEM-EBSD, TEM XRD. Austenite decomposition kinetics was investigated dilatometry. Deformation close the no-recryst...

The effect of different austenite grain size and different cooling rates on the austenite to ferrite transformation temperature and different ferrite morphologies in one Nb-microalloyed (HSLA) steel has been investigated. Three different austenite grain sizes were selected and cooled at two different cooling rates for obtaining austenite to ferrite transformation temperature. Moreover, samples ...

Excellent mechanical properties of nanostructured bainitic steels are primarily related to the ultra fine scale their structure constituents. Typically, such is exhibited by suitably treated with high carbon and silicon content. Regardless, common application this steel grade in industry limited some in-used that have not yet been explained. This mainly concerns possibility joining, long-term o...

The hardened microstructure of 5 wt.% Cr cold work tool steels is mainly martensitic with significant amount retained austenite and some undissolved carbides. Whereas the after tempering shows amounts angular shaped blocky regions, which are interpretated as or fresh martensite. distinction between phases difficult due to morphological similarities. Therefore, regions characterized by electron ...

Steels with a mixed microstructure of allotriomorphic ferrite, bainitic ferrite, retained austenite and martensite have potentially good combinations of high strength and formability. This work describes a kinetic theory for the formation of bainite in steels where the precipitation of carbides is suppressed. The theory is based on the mechanism of transformation. It includes, for example, a nu...