Microhardness and Microstructure on Welding of Nodular Cast Iron Grade FCD 500

The aim of this research is to study the microhardness and the microstructure of the welds of nodular cast iron by SMAW process utilizing two different patterns of filler metal: one uses only ENiFe-CI and the other employs ENiFe-CI as butter layer and followed by E7016. These investigations represent that the highest hardness occurs in the fusion boundary due to carbide formation; the HAZ composes of the formation of bainite and the bottom of the E7016 weld metal comprises martensite. On the contrary, the base metal and the ENiFe-CI weld metal gives lower hardness because of the formation of pearlite and graphite nodules surrounded by ferrite rings and austenite with ferrite at the sub-grain boundary respectively

CdTe Nanowires studied by Transient Absorption Microscopy

Transient absorption measurements were performed on single CdTe nanowires. The traces show fast decays that were assigned to charge carrier trapping at surface states. The observed power dependence suggests the existence of a trap-filling mechanism. Acoustic phonon modes were also observed, which were assigned to breathing modes of the nanowires. Both the fundamental breathing mode and the first overtone were observed, and the dephasing times provide information about how the nanowires interact with their environment

CdTe Nanowires studied by Transient Absorption Microscopy

Transient absorption measurements were performed on single CdTe nanowires. The traces show fast decays that were assigned to charge carrier trapping at surface states. The observed power dependence suggests the existence of a trap-filling mechanism. Acoustic phonon modes were also observed, which were assigned to breathing modes of the nanowires. Both the fundamental breathing mode and the first overtone were observed, and the dephasing times provide information about how the nanowires interact with their environment