Science and Technology on Remanufacturing Laboratory

Beijing, China

Science and Technology on Remanufacturing Laboratory

Beijing, China
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Zhang X.,Harbin Engineering University | Zhang X.,Science and Technology on Remanufacturing Laboratory | Xu B.,Science and Technology on Remanufacturing Laboratory | Dong S.,Science and Technology on Remanufacturing Laboratory | And 3 more authors.
Applied Mechanics and Materials | Year: 2011

In order to enhance the performances of laser remanufacturing part, we combined laser cladding with active screen plasma nitriding duplex treatment to repair metal part. The microstructure, phase structure and micro-hardness of duplex treated coating were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness tester. Wear tests were carried out on reciprocating wear tester under dry sliding condition. The results show that the white layer and the nitrogen diffusion layer were formed after nitriding treatment. The duplex treated coating consists mainly of γ-Fe, CrN, Fe 4N and Fe 3N. The duplex treated coating improved not only surface hardness but also wear resistance. © (2011) Trans Tech Publications.


Liu M.,Science and Technology on Remanufacturing Laboratory | Wang H.,Science and Technology on Remanufacturing Laboratory | Jiang Y.,China naval flying academy | Guo Y.,Science and Technology on Remanufacturing Laboratory | Zhao K.,Science and Technology on Remanufacturing Laboratory
Applied Mechanics and Materials | Year: 2012

The effects of internal spraying environment on the microstructures and mechanical properties of plasma spraying NiCrBSi+15%Mo coatings were investigated. For experimental analysis of spraying environment, a specialized internal plasma device and its test unit were developed. Firstly, microstructures of spraying coatings and powders were analyzed by scanning electron microscopy (SEM). Furthermore, the boding strength, porosity and micro-hardness of the coatings were investigated and determined separately. According to these properties of plasma spraying coating, the influence of spraying environment on the coating properties and specimen temperature could be investigated. The results show that that the coating performances decreased because of the dust, smog and high temperature of the internal spraying environment. The high-performance internal coatings can be obtained by properly designing spraying process and using the special spraying device. © (2012) Trans Tech Publications, Switzerland.


Nan X.,Beijing Institute of Technology | Nan X.,Science and Technology on Remanufacturing Laboratory | Lihong D.,Science and Technology on Remanufacturing Laboratory | Binshi X.,Science and Technology on Remanufacturing Laboratory | And 2 more authors.
Advanced Materials Research | Year: 2012

Fatigue damage degree of crankshaft remanufacturing core was studied based on Metal Magnetic Memory Testing. Bending fatigue test of crankshaft remanufacturing core was conducted on the resonant fatigue test rig and variations of two-dimensional magnetic memory signal distribution in crankshaft pin fillets were studied at different bending fatigue cycle. Experimental research shows that distributions of Hp(x) signals, namely, tangential component of spontaneous stray field and Hp(y) signals, namely, normal component of spontaneous stray field in crankshaft pin fillets have no obvious change with loading cycle when no crack initiation and propagation occur in crankshaft pin fillets. Characteristics of Hp(x) and Hp(y) signal both show dynamic variations when crack in crankshaft pin fillets initiates and extends at medium rate or high rate. Metal Magnetic Memory Testing is a dynamic method for monitoring fatigue crack propagation in crankshaft. © (2012) Trans Tech Publications, Switzerland.


Liu M.,Science and Technology on Remanufacturing Laboratory | Wang H.,Science and Technology on Remanufacturing Laboratory | Jiang Y.,Science and Technology on Remanufacturing Laboratory | Guo Y.,Science and Technology on Remanufacturing Laboratory | Song Y.,Wuhan Naval University of Engineering
Applied Mechanics and Materials | Year: 2013

In this paper, an optimization experiment was designed to get the optimal performance of supersonic sprayed coating. Response surface methodology based on Box-Behnken design has been used in this experimental design. Input factors were designed with four representative spraying parameters: powder feed rate, spraying power, argon flow rate and hydrogen flow rate. Porosity of NiCrBSi coating, as the only measured response, was applied to estimate the influence of spraying process on the coating performance. Results indicate that porosity is the most sensitive to change powder feed rate, followed by argon flow rate, hydrogen flow rate and spraying power. A minimum porosity of 1.8% was obtained under the optimization spraying parameters. © (2013) Trans Tech Publications, Switzerland.


Dong L.,Science and Technology on Remanufacturing Laboratory | Xu B.,Science and Technology on Remanufacturing Laboratory | Wang H.,Science and Technology on Remanufacturing Laboratory | Xue N.,Science and Technology on Remanufacturing Laboratory
Applied Mechanics and Materials | Year: 2012

It has previously been reported that when a fatigue crack grows in ferromagnetic materials, abnormal magnetic signals are spontaneously emitted, which can provide a powerful tool for fatigue crack life prediction. However, there is no physical model yet available to explain the mechanism for the formation of these self-emitting magnetic signals. In the present research, tension-tension fatigue tests of center-cracked sheet specimens were performed. The variations in the normal component of the self-emitting magnetic signals, Hp(y), on the surfaces of the specimens were measured during the fatigue test. The differences in peak-to-peak value, Hp(y), before and after failure of a specimen, were characterized. Consequently, a physical model based on magnetic charge was proposed, which was in good agreement with the experimental results. The model is helpful for understanding the inherent mechanism of the self-emitting magnetic signals. © (2012) Trans Tech Publications, Switzerland.


Dong L.-H.,Science and Technology on Remanufacturing Laboratory | Xu B.-S.,Science and Technology on Remanufacturing Laboratory | Xue N.,Science and Technology on Remanufacturing Laboratory | Wang H.-P.,Science and Technology on Remanufacturing Laboratory | Li H.-Y.,Science and Technology on Remanufacturing Laboratory
Advances in Manufacturing | Year: 2013

This paper reviewed the main research work in the field of remaining life prediction of crankshaft remanufacturing core by Science and Technology on Remanufacturing Laboratory. Based on the results of finite element analysis, the R angle zone of crankshaft was determined as a major measuring position. A special measuring probe is developed, and bending fatigue bench tests were carried out to collect electromagnetic damage information during fatigue process. A neural network model was established to identify damage degree of crankshaft core, and a damage evaluation equipment for crankshaft core was developed. © 2013 Shanghai University and Springer-Verlag Berlin Heidelberg.


Li X.,Science and Technology on Remanufacturing Laboratory | Wang H.,Science and Technology on Remanufacturing Laboratory | Guo Y.,Science and Technology on Remanufacturing Laboratory | Liu M.,Science and Technology on Remanufacturing Laboratory | Zhao K.K.,Science and Technology on Remanufacturing Laboratory
Advanced Materials Research | Year: 2012

NiCr-Cr 3C 2-Ni/MoS 2 composite coating was prepared by supersonic plasma spraying (S-PS) process. The tribological properties of the composite coating at 25°C, 300°C, 500°C and 750°C were studied. The wear mechanism for the coating was discussed considering the microstructures, compositions and mechanical properties of the composite materials. Results show that the coating exhibits good tribological properties at 750°C, which was attributed to the compact and continuous Cr 3O 2 transfer film formed on the friction surface. The wear rate of the coating increases with the temperature increase, which was associated with the decrease of the mechanical strength and stress-resistance of the coatings.

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