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In-Situ Observation Of Sulfide Precipitation In A Low-Carbon, Titanium Alloyed Steel, Sima Aminorroaya-Yamini, Rian J. Dippenaar, Mark H. Reid
In-Situ Observation Of Sulfide Precipitation In A Low-Carbon, Titanium Alloyed Steel, Sima Aminorroaya-Yamini, Rian J. Dippenaar, Mark H. Reid
Faculty of Engineering - Papers (Archive)
Removal of inclusions is of greatsignificance to steelmakers and the scientific principles underpinning inclusion removal has been the subject of numerous investigations in the past and during the last few decades, it has become increasingly obvious that inclusions can be utilized as an effective tool for the control of microstructure1 . Manganese sulfide precipitates are known to crystallize and precipitate preferentially in interdendritic regions during solidification, due to segregation of manganese and sulphur2 and these inclusions have traditionally been used for the dual purpose of improving the machinability and controlling of grain structure in steel. Small MnS particles restrain grain …
Thermal Stability And Crystallization Kinetics Of Mechanically Alloyed Tic/Ti-Based Metallic Glass Matrix Composite, Laichang Zhang, J. Xu, J Eckert
Thermal Stability And Crystallization Kinetics Of Mechanically Alloyed Tic/Ti-Based Metallic Glass Matrix Composite, Laichang Zhang, J. Xu, J Eckert
Faculty of Engineering - Papers (Archive)
A Ti-based metallic glass matrix composite with 10vol% TiC is synthesized by mechanical alloying. The thermal stability and crystallization kinetics of the metallic glass and compositepowders are investigated by differential scanning calorimetry in the mode of isochronal heating and isothermal annealing. The isothermal transformation kinetics is analyzed by the Kolmogorov-Johnson-Mehl-Avrami equation. The values of the Avrami exponent calculated for low crystallization volume fractions imply that the crystallization of both types of powders is governed by diffusion-controlled three-dimensional growth. The mean activation energy of crystallization for the composite is slightly lower than that of the Ti-based metallic glass. The addition of …