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RISS 인기검색어
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- 저자 : Songhui Wang (검색결과 3 건)
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Achieving Ultra-High-Strength and Good Ductility of the ZK60 Alloy Sheet by High Strain-Rate Rolling
Songhui Wang,Wencong Zhang,Jianlei Yang,Xeuyan Jiao,Jinqi Pan,Guannan Chu,Xiangyu Dai 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.4
A superior combination of the ultra-high tensile strength (~ 419.9 MPa), the yield strength (~ 376.9 MPa) and the elongation(~ 14.8%) ZK60 sheet was successfully achieved by high-strain rate rolling. The ultrahigh strength was attributed to theuniform ultrafine-grained structure. The excellent ductility was ascribed to the ultrafine grains, low dislocation density andweakened basal texture in the final structure.
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Extraordinary Bending Formability of Mg–2.5Nd–0.5Zn–0.5Zr Alloy Sheet Through Pulsed Current
Wencong Zhang,Songhui Wang,Jinqi Pan,Jianlei Yang 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
The pulsed current effect on the bending formability and microstructure evolution of the Mg–2.5Nd–0.5Zn–0.5Zr (wt%)alloy sheet was systematically studied at near room temperature (20 ~ 45 ℃). The results showed that the bending ability ofthe alloy could be significantly improved by the pulsed current. Specifically, compared with the non-electrically-assistedbending, the limiting bending depth (from 5.05 to 14.82 mm) and limiting bending angle(from 57 to 145°) of the alloy wereincreased by 193.5% and 154.3%, respectively, and the bending yield strength (from 252 to 162 MPa) decreased by 35.7%. When the peak current density was 12.1 A/mm2 (EA12), the limiting bending angle reached 145°, and there was no crackon the outer surface of the bending sample. The main reason was that the pulsed current promoted the dislocation movement,which was conducive to the activation of basal slip and non-basal slip to maintain deformation compatibility. Thedeformation mechanism of electrically-assisted bending samples showed that {10–12} twin dominated in the compressionzone, while basal slip dominated in the tension zone. In addition, the effects of peak current density on microstructure,texture evolution and fracture mechanism were analyzed in detail. It provided important theoretical guidance for masteringthe bending-forming mechanism of rare-earth magnesium alloys.
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Riqiang Li,Jianxing Wang,Songhui Li 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.4
Omethoate is an acute organophosphorus pesticide which is widely used. It presents a high pollution potential and health risk nowadays. In this study, Bacillus sp. YB-10, which was isolated from the activated sludge of a pharmaceutical wastewater treatment plant, was used for degrading omethoate. The culture conditions and degradation characteristics were investigated. Results showed that the Bacillus sp. YB-10 could degrade omethoate through co-metabolism. The optimal carbon and nitrogen sources were glucose and NH₄NO₃, respectively. Response surface methodology (RSM) results showed that the most appropriate nutrition ratio of C:N:P was 3:1:1 when degrading 1,000 ㎎/L of omethoate. Omethoate degradation kinetics could be described by a first-order rate equation. The optimal degradation conditions were pH of 7.0, temperature of 30℃, initial bacteria concentration of 0.25%, rotation speed of 150 r/min. Under the optimal conditions, the degradation rate reached 77.24% within 5 d by the Bacillus sp. YB-10 when the initial omethoate concentration was 1,000 ㎎/L.
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