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Tribological properties of electroless Ni-P-SiC composite coatings in rolling/sliding contact under boundary lubrication

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International Journal of Minerals,Metallurgy and Materials 2007年第2期14卷 167-172页

作者： Shu-Hue Hsieh Shen-Jenn Hwang Ting-Kan Tsai Wen-Jauh Chen Department of Materials Science and Engineering Formosa UniversityHuwei China Taipei Department of Mechanical Design Engineering Formosa UniversityHuwei China Taipei Department of Materials Engineering Pingtung University of Science and TechnologyPingtung China Taipei

Ni-P-SiC composite coatings were prepared under a given bath composition and operation parameters of electroless plating. The tribological properties of the Ni-P-SiC composite coatings after annealing at 400°C for 1 h were tested in rolling/sliding contact under boundary lubrication condition using a two-roller tribometer. The measurement contained friction coefficient, contact surface temperature, contact electrical resistance, and wear rate of the Ni-P-SiC composite coatings under various slide to roll ratios, loads, and rolling speeds. For the simultaneous examination of the effect of the chosen parameters on the tribological properties of the Ni-P-SiC composite coatings, an orthogonal regression experimental design method was used.

关键词： Ni-P-SiC composite coating rolling-sliding friction wear two-roller test

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Understanding microstructure-evolution-dependent fracture behaviors in pearlitic steels

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Journal of Iron and Steel Research International 2020年第3期27卷 334-341页

作者： Hu Chen Chi Zhang Hao Chen Zhi-gang Yang Lei Chen Key Laboratory of Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China Department of Mechanical Engineering Mississippi State UniversityStarkvilleMS 39762USA

Microstructure evolution or degradation has been well recognized to be closely related to the formation of microcracks in pearlitic rails and *** rolling contact fatigue machine was employed to simulate the rail-wheel contact,and the microstructure evolution and crack formation of pearlitic steels subjected to rolling-sliding contact loading were then experimentally *** further quantitatively predict the fracture behaviors,a phase-field model was herein established to investigate the cyclic loading-driven microstructure evolution and the microstructure-dependent fracture resistance in *** coupling of microstructure evolution and crack propagation was realized through the introduction of two-set order parameters,i.e.,the crack field and the microstructure field,and the microstructure-dependent fracture *** proposed model can predict the fracture resistance of microstructure at different depths from the contact surface,after different rolling cycles and with different initial pearlitic microstructures,which can shed light on the design of damage-resistant microstructure of pearlitic steels.

关键词： Pearlitic steel rolling-sliding contact Microstructure evolution Crack propagation Phase-field model

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