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Wang H.M.,Shenyang University of Technology | Wang S.J.,Shenyang University of Technology | Lv X.R.,Shenyang University of Technology | Wang Z.M.,Shenyang Casting and Forging Industry Co.
Materials Research Innovations | Year: 2015

In this study, the effect of different acrylonitrile contents including 18, 26 and 41% (abbreviated as N18, N26 and N41) on the physical-chemical properties of nitrile-butadiene rubber was studied. In order to correlate, the effect of different acrylonitrile contents and different time immersed in crude oil, the comparison was carried out at comparable value of volume change rate of rubber in crude oil swollen for nitrile-butadiene rubber. The abrasion loss and the friction coefficient in crude oil were studied with different load. In addition, the effects of crude oil, Fourier transform infrared spectroscopy and scanning electron microscopy analysis have been studied. © W. S. Maney & Son Ltd 2015. Source


Li R.-D.,Shenyang University of Technology | Tang M.,Shenyang University of Technology | Xiang Q.-C.,Shenyang University of Technology | Qu Y.-D.,Shenyang University of Technology | And 2 more authors.
Zhuzao/Foundry | Year: 2015

By observation the defects existed in the large scale casting, the critical solid fraction and Niyama criterion of the ProCAST simulation software were used to simulate and analyze the solidification process of the thick position in the upper bracket of a gyratory crusher. The locations of the hot spots related to the shrinkage cavity and the Niyama value related to porosity defect in feeding areas were estimated. Based on this, the original casting technique was improved, i.e., changing one blind riser as two blind risers which were symmetric distributed at the thick position of the casting. The results obtained by simulation indicate that the improved process meets the directional solidification manner. The isolated hot spots are eliminated and the value of Niyama criterion is larger than critical one of no porosity defect formation. Therefore it is predicted that no shrinkage cavity and porosity can be formed in the casting. The simulated results were further tested in the practical production and a good agreement between them was obtained. ©, 2015, Chinese Mechanical Engineering Society. All right reserved. Source


You J.-H.,Shenyang University of Technology | Tao S.-W.,Shenyang University of Technology | Qiu K.-Q.,Shenyang University of Technology | Ren Y.-L.,Shenyang University of Technology | Yang G.-X.,Shenyang Casting and Forging Industry Co.
8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 | Year: 2013

The Mg-7Al-xCa-2Si-0.8Zn-0.5Sr-0.4Mn(x=1,2,3,4wt%) alloys cylindrical specimens were fabricated using the same length metal mold. The hot tearing susceptibility of alloy is evaluated by the Crack-rod critical diameter and hot tearing sensitive coefficient. The optical microscopy, scanning electron microscopy (SEM) and the detector of energy dispersive (EDX) were used to investigate the hot tearing behavior of magnesium alloys. The results indicate that the microstructures of alloys are refined with Ca addition. When the Ca content is 3.0%, the crack-rod critical diameter and hot tearing sensitive coefficient are both the lowest, at the same time, the fracture area of α-Mg dendrite is zero and that of eutectic phase is 100%. In the crack formation process, the eutectic phase have the trend of enrichment to crack and the ability to fill in cracks, so the hot tearing susceptibility of alloy is reduced. Source


You J.-H.,Shenyang University of Technology | Yang C.-L.,Shenyang University of Technology | Qiu K.-Q.,Shenyang University of Technology | Yang G.-X.,Shenyang Casting and Forging Industry Co.
8th Pacific Rim International Congress on Advanced Materials and Processing 2013, PRICM 8 | Year: 2013

Alloying elements Si and Ca were employed to the Mg-5Sn-0.5Sr alloy in order to improve the heat resistance properties of Mg alloys. Mg-5Sn-0.5Sr-xSi (x=1, 2) and Mg-5Sn-0.5Sr-ySi-0.5Ca (y=1, 2) alloys were fabricated using the pot resistance furnace under protection of N2+SF6 atmosphere. The phase constituent and microstructure of the as-cast alloys were analyzed by x-ray diffractometer (XRD), optical microscopy (OM) and scanning electron microscopy (SEM) respectively. The results show that the Mg2Sn phase, Mg2Si phase precipitate on the grain boundary during eutectic reactions and MgSnSr phase inside the grains as primary phase for as-cast Mg-5Sn-0.5Sr-xSi (x=1, 2) alloys, the volume fractions of Mg2Si phase increases with the increasing of Si element. For Mg-5Sn-0.5Sr-ySi-0.5Ca (y=1, 2) alloys, furthermore, the addition of Ca element can promote significantly the formation of primary (Ca, Sr)MgSn phases, inhibit the precipitation of Mg2Sn phase on the grain boundary. Both Ca and Sr additions can refine the Mg2Si phase. Source


Feng Y.-Y.,Shenyang Polytechnic College | Su W.-S.,Shenyang Casting and Forging Industry Co.
Zhuzao/Foundry | Year: 2011

To solve the production difficulties of the large size compressor cylinder casting, some key points on process control were pointed out from aspects such as the pattern making, mould and core design, mould closing operation, compactness control of the casting, and so on. Through experimental data analysis and process optimization, the large scale cylinder casting was manufactured successfully at its first try. The cylinder casting had good machinability and wear resistance; moreover the better economic benefit was obtained. Source

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