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3 results on '"Jianyin Chen"'

1. A novel estimation model for hysteresis loss based on semi-minor loops

Author

Jianyin Chen, Jien Ma, Siqi Wu, Lin Qiu, Xing Liu, and Youtong Fang

Subjects
Hysteresis loss, Core loss, Soft magnetic material, Electrical machine, Electrical engineering. Electronics. Nuclear engineering, TK1-9971
Abstract

This paper proposes an estimation model of hysteresis loss based on the mapping of the hysteresis loop conducted through tiny material samples with the aid of the Superconducting Quantum Interference Device (SQUID). This approach allows precise measurement of hysteresis loops. The aim of this paper is to develop a precise estimation model for hysteresis loss, one component of core loss, so as to improve the overall estimation accuracy of the entire core loss under complex excitations. First, with the help of the SQUID system and measurements conducted on tiny samples, the proposed model manages to minimize the impact of eddy current throughout the measurement and the modeling of hysteresis loss. This contrasts with the use of the conventional Steinmetz model and its modifications. Moreover, compared with methods including the modified Steinmetz equation (MSE) and the generalized Steinmetz equation (GSE) which merely focuses on the overall iron loss under simple non-sinusoidal excitations, the model presented here enables the estimation of hysteresis loss under complex excitations where multiple peaks and DC-bias take place. This approach will be very useful in situations such as those requiring pulse-width modulation (PWM) excited converters which are quite common on occasions including wind power systems. The estimation error of this model on the actual coil is within 15% under given excitations.

Published
2022
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2. Laser weldability of Zr-2.5Nb alloy to AISI 410 stainless steel with Ni filler

Author

Mitch King, Jianyin Chen, Lijue Xue, and Ahmed Khalifa

Subjects
0209 industrial biotechnology, Toughness, Materials science, Weldability, Alloy, Intermetallic, chemistry.chemical_element, 02 engineering and technology, Welding, engineering.material, Industrial and Manufacturing Engineering, law.invention, AISI 410 stainless steel, laser beam welding, 020901 industrial engineering & automation, Brittleness, law, dissimilar metal joining, Ni interlayer, Zr-2.5Nb, Metallurgy, Metals and Alloys, 021001 nanoscience & nanotechnology, Computer Science Applications, Nickel, chemistry, Modeling and Simulation, Ceramics and Composites, engineering, 0210 nano-technology, Solid solution
Abstract

The nickel interlayer improved the laser weldability of Zr-2.5Nb to AISI 410 stainless steel. The fusion zone contained a large amount of refined and tough dendritic γ-Ni(Fe, Cr) solid solution (182 ∼ 268 HV), while the brittle Zr(Fe, Cr)2 intermetallic compound (1171 ∼ 1460 HV), which was the main phase as the result of direct welding of Zr-2.5Nb to SS410 as well as the source responsible for the welding cracks, disappeared. Only limited quantities of Zr2(Ni, Fe), Zr7Ni10 (and/or Zr2Ni7) intermetallics were present mainly in the form of thin layers (less than 200 μm thick in total) near the fusion interface with Zr-2.5Nb. Those Zr-Ni based intermetallics showed relatively higher toughness and lower hardness (301 ∼ 497 HV) than the brittle Zr(Fe, Cr)2, which reduced the overall cracking sensitivity of the laser-weld.

Published
2017

3. A study of the abrasive wear behavior of laser-clad tool steel coatings

Author

Sheng-Hui Wang, Lijue Xue, and Jianyin Chen

Subjects
Materials science, engineering.material, law.invention, Carbide, Coating, law, tool steel, Materials Chemistry, Composite material, Austenite, Metallurgy, Abrasive, Surfaces and Interfaces, General Chemistry, Condensed Matter Physics, Laser, Surfaces, Coatings and Films, X-ray diffraction, Wear resistance, Martensite, Tool steel, laser cladding, engineering, human activities, abrasive wear test, scanning electron microscopy
Abstract

A comparative study of the abrasive wear behaviour has been conducted on several tool steel coatings that were deposited by laser cladding process using a CW CO 2 laser in combination with a blown powder feed technique. The laser-clad CPM 15V and CPM 10V coatings exhibit superior abrasive wear resistance as compared with the reference material, AISI D2 tool steel. In contrast, the wear resistance of the CPM 9V and M4 coatings is inferior to that of the D2 steel. As multiple overlapping clad-tracks are used to produce a coating covering relatively large area, a thin layer of a pre-deposited clad-track will be “over-heated” while depositing the next adjacent one. Depending on the coating material, this re-heated zone (RHZ) can exhibit different wear rate compared with the other area of the track in the as-clad condition, which is especially significant for the CPM 10V coating. For coatings with a large proportion of retained austenite, post heat-treatment promotes the transformation of the retained austenite to martensite, improving the wear resistance. The wear resistance of tool steel coatings is dependent upon the matrix microstructure and the features of dispersed carbides, such as their type, proportion, shape, size and distribution.

Published
2006

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