Impact Influence on Deposited Metal of Flux-cored Wire DG7
The shield machine cutter suffers from strong im- pact and grain-abrasion in high stress when it works in Bei- jing.The cutter wears down quickly and the import cutter's drive life is about 250 meters.Flux-cored wire named DG7 was developed for the cutter's repair and reproducing.The cutter's drive life in drive testing reached 780 meters when it was improved by DG7.The article impactes DG7's deposited metal different times by different weight shots and tests the transformation of the deposited metal's hardness,microstruc- ture and anti-abrasive performance.
(Received 19 June 2011 ; in final form 25 February 2012) Abstract In this study, we investigated the spin dependent electronic transport of a fishbone-like nanostructure including two magnetic atoms at its ends. The electronic conductance of this nanostructure for three different orientations of atomic magnetic moments was numerically studied when the structure was sandwiched between two nonmagnetic leads. By using Green’s function technique at the tight-binding model, we calculated the spin dependent electronic transmission coefficient. The calculated results revealed that the conductance depends on the incident electron energy as well as the magnitude and orientation of atomic magnetic moments in the nanostructure.