Abstract This research paper mainly studied the microstructure and hardness of weld bead welding heat affected zone ultrafine grain steel after CO 2 gas-shielded welding. After normalizing quenching treatment, changes in welded joints were studied. These experimental results showed that joint was dendritic. The a mixed structure proeutectoid ferrite, side plate bainite, pearlite. overheated HAZ...

Shear localization is one of the most important failure mechanisms subjected to high-strain-rate deformation and has significant effects on process, plastic deformation, catastrophic a material. was observed in serrated chips produced during high-speed cutting CoCrFeMnNi high-entropy alloy. Electron backscatter diffraction performed systematically investigate microstructural evolution shear ban...

Abstract Copper rods with ultrafine-grained microstructure, obtained by multi-turn ECAP processing, were subjected to Direct Drive Rotary Friction Welding using various processing parameters, such as rotational speed and pressure, which resulted in different energy heat input. Even though friction welding is a high process, proper selection of parameters it was possible maintain grain size at a...

This paper aims at investigating the influence of partial replacement of Portland cement with ultrafine fillers compared to limestone powder on the durability and mechanical characteristics of concrete. For this purpose, ultrafine calcium carbonate materials with different specific surface areas of 9.7 and 15.1 m2/g and limestone powder (0.72 m2/g) were used. The results indicate that the ultra...

In this research, variant selection of martensite transformed from ultrafine-grained (UFG) austenite fabricated by accumulative roll bonding (ARB) process and subsequent annealing was investigated with respect tomorphology of parentaustenitic phase. The results show that the original shape of austenite grain is very effective factor in determiningthe preferred variants of martensite transformed...

The Transmission Electron Microscopy (TEM) and Energy Dis­ persive Spectroscopy (EDS) were used to determine morphology and elemental composition of a variety of freshly emitted soot par­ ticles (acetylene flame, candle flame, kerosene flame, diesel exhaust, electric arc, plastic burning, styrofoam burning, wood burning [white oak and pine bark], and rice straw burning), which can be possible c...