Light Metal of Alloy Material Engineering Center in Hebei Province

Baoding, China

Light Metal of Alloy Material Engineering Center in Hebei Province

Baoding, China
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Sun W.-L.,Agricultural University of Hebei | Sun W.-L.,Light Metal of Alloy Material Engineering Center in Hebei Province | Li Y.,Agricultural University of Hebei | Zhao Y.-L.,Baoding Lizhong Wheel Co. | And 5 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2012

ZrN films were prepared on 1Cr18Ni9Ti stainless steel by using unbalanced magnetron sputtering technique. Surface morphology and composition of the films were observed and analyzed by means of SEM and EDS. Thickness of the films was measured by optoelectronic profilometer.Adhesion of the films prepared by different sputtering time and temperature was examined by scratching grid method. The results show that the ZrN film with certain thickness, stable composition and compact structure is obtained by adjusting the sputtering time and temperature. The adhesion of the films is enhanced as sputtering time increases from 1 min to 20 min, and the adhuesion tends to stabilization when sputtering time over 20 min. The adhesion of the ZrN films increases with increasing sputtering temperature from 30°C to 90°C and then decreases when the temperature exceeds 90°C.


Wang H.-Q.,Agricultural University of Hebei | Wang H.-Q.,Light Metal of Alloy Material Engineering Center in Hebei Province | Xing Y.-Q.,Agricultural University of Hebei | Sun B.,Agricultural University of Hebei | And 4 more authors.
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment | Year: 2013

TiN films were deposited on aluminium alloy by mid-frequency reactive magnetron sputtering process. The TiN films with different properties in color, thickness, adhesion and hardness were prepared by changing the processing parameters of nitrogen flow rate, sputtering time and target power. The film color was calibrated based on CIE. The reflectance curve, color shading and color simulation of the films were studied by a photoelectric spectrocolorimeter CM-2600d. The adhesion of TiN films was examined by the scratching grid method, the hardness of TiN films was measured by MH-6 microscopic hardness tester. The results show that the optimum processing parameters as follows; nitrogen flow rate of 18 mL/min, sputtering time of 10 min and target power of 5 kW, by which the TiN thin films with golden yellow color, adhesion of 0 grade and hardness of 427.8 HV. can be obtained and the films have excellent mechanical properties.


Sun W.-L.,Agricultural University of Hebei | Sun W.-L.,Light Metal of Alloy Material Engineering Center in Hebei Province | Li Y.,Agricultural University of Hebei | An G.,Agricultural University of Hebei | Cheng Y.,Agricultural University of Hebei
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

To improve the mechanical properties of the 35CrMoA steel, unconventional treatment methods of improving the heating temperature and salt bath quenching can be adopted for simple workpieces. The Mo content in the steel has a significant effect on the workpiece mechanical properties after quenching. The effects of Mo content on the metallographic structure and mechanical properties after quenching were studied by means of direct reading spectroscopic chemical composition analysis, SEM fracture microstructure observation, mechanical property testing, hardness testing and metallographic analysis. The results showed that the Mo content greatly affects the toughness properties of the 35CrMoA steel workpiece after heat treatment, and using the higher range of CNS about the Mo content can guarantee the workpiece impact toughness. For the 35CrMoA steel with lower Mo content, processes of high temperature heating and salt bath quenching are unsuited.


Li Y.,Agricultural University of Hebei | Sun W.-H.,Agricultural University of Hebei | Sun W.-H.,Light Metal of Alloy Material Engineering Center in Hebei Province | Cheng Y.,Agricultural University of Hebei | An G.,Agricultural University of Hebei
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

The hot rolled seamless pipes is made by Q345B steel at high temperature, it cracks along the radial direction during the process of enlarging hole. The chemical composition, microstructure, fracture morphology and mechanical properties of the Q345B raw materials, the finished pipe and cracked pipe were analyzed by using OM, SEM, BDS and direct reading spectrometric etc. Experimental result showed that in the hot rolled process the cracks of steel surface could not heal because of high temperature oxidation and reside in seamless pipes. When the hole was further enlarged, the extension of cracks would destroy the seamless pipes. It could be concluded that the main causes of steel pipe cracking was residual longitudinal capillary crack in the seamless steel pipe, and non-metallic inclusions in the seamless steel pipe played a supporting role.


Wang H.-Q.,Agricultural University of Hebei | Wang H.-Q.,Light Metal of Alloy Material Engineering Center in Hebei Province | Sun W.-H.,Agricultural University of Hebei | Sun W.-H.,Light Metal of Alloy Material Engineering Center in Hebei Province | Xing Y.-Q.,Agricultural University of Hebei
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

According to the method of chemical composition analysis, metallographic examination and hardness test, the fracturing reason of 40Cr steel of dacromet bolt was analyzed. The result showed that there were excessive phosphorus element that is easily to form Fe 3P, resulting in the cold brittleness. After the heat treatment there would be more carbides in the microstructure. According to the second standard level of JB/T 8837-2000 undissolved carbides (1~3 pass), it was evaluated 5 level and did not meet the requirements. So much carbides would reduce the carbon concentration, resulting in the decrease of the intensity. According to the national standard of GB/T 1231-2006, 40Cr material hardness was tested by the 8.8S standard. The test result indicated that the hardness value was greater than that of the national standard. It could be concluded that the main reasons which caused the 40Cr bolt fracture were the excessive phosphorus element, the more carbides in the microstructure and the greater hardness than the national standard.


Wang H.-Q.,Agricultural University of Hebei | Wang H.-Q.,Light Metal of Alloy Material Engineering Center in Hebei Province | Sun W.-L.,Agricultural University of Hebei | Sun W.-L.,Light Metal of Alloy Material Engineering Center in Hebei Province | Xing Y.-Q.,Agricultural University of Hebei
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

The 10 # steel cracking reason of air cooler was analyzed by means of SEM and OM. Based on the research of chemical composition, mechanical properties, macroscopic and microscopic test, the main reason of creaking was found out. Analysis results showed that it was the great deal of rusts inside of the pipe that made the pipe much easier to be creaking in the cold-drawing process. And much cementites in grain boundary of ferrite made the plasticity and ductility lower, resulting in the increase of the brittleness. In order to avoid creaking, attentions should be paid attention to the following aspects. The first is the quality improvement of raw material. The second is the correct normalization heat treatment process that should be put into practice strictly.


Wang H.-Q.,Agricultural University of Hebei | Wang H.-Q.,Light Metal of Alloy Material Engineering Center in Hebei Province | Sun W.-L.,Agricultural University of Hebei | Sun W.-L.,Light Metal of Alloy Material Engineering Center in Hebei Province | Xing Y.-Q.,Agricultural University of Hebei
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

ZrN film was made on aluminium alloys surface by mid frequency reactive magnetron sputtering process. The influences of nitrogen flow rate, sputtering time and temperature on the deposition rate and properties were studied. The experimental result showed that the corrosion properties of ZrN film would increase with the increase of nitrogen flow rate. When the nitrogen flow rate reached 15 seem, the corrosion properties were turned down. The adhesion of ZrN film would increase with the increase of the deposition time and the temperature, and when the time reached 30 min and the temperature was 100°C, the maximum deposition value could be obtained. The film thickness was proportional to the deposition time. When the thickness increased, the color of film from light yellow became yellow and golden. As the thickness was more than 70 nm, the color became dark.


Xing Y.-Q.,Agricultural University of Hebei | Wang H.-Q.,Agricultural University of Hebei | Wang H.-Q.,Light Metal of Alloy Material Engineering Center in Hebei Province | Sun W.-L.,Agricultural University of Hebei | Sun W.-L.,Light Metal of Alloy Material Engineering Center in Hebei Province
Dongbei Daxue Xuebao/Journal of Northeastern University | Year: 2012

Failure analysis on the automobile swing was carried out by means of SEM and OM to find the reason of automobile swing fracture. According to chemical composition, macroscopic and microscopic test, the quality problems were decided inside a failure workpiece. Analysis results showed that the fracture source belonged to the ductile fracture which was in the swing corner. The main reasons were as follows. The first was the high temperature when formed the austenite structure process, resulting in some widmanstatten structures. The second was that there were more MnS inclusions along the rolling direction, which made the transverse ductility to be lower and caused to the automobile swing fracture. Therefore, the steelmaking process should be improved such as to reduce the temperature of austenite forming process, and to improve the transverse ductility of the HP295 steel, which could make the steel more purified.


Wang H.,Agricultural University of Hebei | Wang H.,Light Metal of Alloy Material Engineering Center In Hebei Province | Sun W.,Agricultural University of Hebei | Sun W.,Light Metal of Alloy Material Engineering Center In Hebei Province | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

Aluminum alloy have the active chemical properties,low standard electrode potential, and the surface will be easily forming about 1-3nm oxide film in dry air, therefore aluminum alloy have the poor corrosion resistance.ZrN film deposited by mid frequency reactive magnetron sputtering process on aluminium alloy surface in order to improve the corrosion performance. Study the influences of nitrogen flow rate, sputtering time and temperature to the corrosion performance. The results show that: The corrosion performance of ZrN films will be improved with the nitrogen flow rate increase,but when the nitrogen flow rate was more than 18sccm, ZrN film corrosion resistance will be reduce;The corrosion performance improved with the sputtering time increase,when the time reach 15min, ZrN film corrosion resistance was no longer increase;The corrosion performance improved with the temperature, when the temperature reach 130°C, the corrosion resistance was no longer increase.The best process parameters was: nitrogen flow rate 18sccm, sputtering time 15min, temperature 130°C. © (2013) Trans Tech Publications, Switzerland.


Wang H.,Agricultural University of Hebei | Wang H.,Light Metal of Alloy Material Engineering Center In Hebei Province | Sun W.,Agricultural University of Hebei | Sun W.,Light Metal of Alloy Material Engineering Center In Hebei Province | And 2 more authors.
Applied Mechanics and Materials | Year: 2013

TiN film deposited by mid frequency reactive magnetron sputtering process on aluminium alloys surface, which can improved the color of aluminium alloys.Use International Commission on Illumination(CIE) 1976(L*, a*, b*) to calibrate the film color,and use the photoelectric spectrocolorimeter of CM-2600d to research the influence of nitrogen flow rate, sputtering time to the film color. The results show that, TiN thin film color will be change from light yellow, yellow, golden yellow to deep yellow with the nitrogen flow rate and the sputtering time increased.When the nitrogen flow rate reach 18sccm and the sputtering time reach 15min,the color parameter will be L*= 83,a*= 2,b*= 30. At this point, the film thickness is 70nm, TiN thin films have golden yellow color, which have the excellent mechanical characteristic. © (2013) Trans Tech Publications, Switzerland.

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