MODIFICATION OF CLAYS WITH IONIC LIQUIDS FOR POLYMER NANOCOMPOSITES by Neung Hyun Kim In attempts to prepare nanofillers with enhanced compatibility with a polymer matrix, cationic and anionic clays susceptible to exchange of their interlamellar ions with a variety of other cations or anions, were selected. In order to treat cationic clay, montmorillonite, which contains sodium ions as interlay...

The evolution of deformation from plasticity to localization damage is investigated in ferritic-pearlitic steel through nanometer-resolution microstructure-correlated SEM-DIC (µ-DIC) strain mapping, enabled highly accurate microstructure-to-strain alignment. We reveal the key mechanisms ferrite and pearlite as well their into relation microstructural arrangement. Notably, two contrasting were i...

A method of collecting composition data and examining structural features of pearlite lamellae and the parent austenite at the growth interface in a 13wt. % manganese steel has been demonstrated with the use of Scanning Transmission Electron Microscopy (STEM). The combination of composition data and the structural features observed at the growth interface show that available theories of pearlit...

Refining the grain size of γ-TiAl alloys to improve their strength and ductility is academic interest. Thus, we report a multi-stage heat treatment method consisting solution treatment, cyclic annealing, short aging refine microstructure Ti–48Al–2Cr–2Nb alloy. The solution-treated was refined from 1100 191 μm by promoting feathery γ packets. Fine duplex grains below 23 were obtained through dis...

The damage mode of U75V rail steel in application is determined by its rolling wear behavior. In this paper, the pearlite microstructure characterized to investigate relationship between and fatigue results show that, with decreasing lamellar spacing, resistance increases contact decreases. spacing causes change mechanism from abrasive adhesive wear, as well damage. smaller is, stronger deforma...

The present article is concerned with a theoretical and experimental study of the growth kinetics of pearlite in a 0.4C-1.6Mn medium carbon steels. Factors controlling the isothermal formation of this microconstituent are explored in this work. In this sense, the transition temperature between local equilibrium (LE) and no partition local equilibrium (NPLE) growth mechanisms is theoretically de...

Abstract The present work investigates the resistance of a progressively cold-drawn carbon steel wire against hydrogen embrittlement. In this study, analytical and numerical methods are used to determine critical content, ratio embrittlement indices different material conditions. with highest degree cold deformation shows content improved At higher degrees deformation, stronger trapping, which ...

A two-dimensional diffusion based model is developed to describe transformation of austenite into ferrite and pearlite under continuous cooling conditions. The nucleation of ferrite is assumed to occur over grain boundaries and the nucleation of pearlite is assumed to be taking place all over the grain and at growing ferrite–austenite interfaces, when the composition and temperature conditions ...

This paper studied effects of ultrasonic treatment during the solidification process on structure formation of low carbon steel. Results showed that with ultrasonic treatment grains were refined and the steel ingot avoided the cast widmanstatten structure. When ultrasonic treatment was employed, pearlite was broken and the average length of pearlite was decreased from 550mm to 140mm. The corres...

a gel composite (based on polyacrylamide and crosslinker cr(iii) acetate) was prepared by solvent method (distillate and water formation) and nanoclay particle (kaolinite). using xrd tests, d001 was evaluated for kaolinite nanoparticles in gel composite. kaolinite modification using dimethyl-sulfoxide led to increase interlamellar spacing from 7.21 to 10.82 o a. based on the results obtained fo...