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201 results on '"Lei, Yucheng"'

17. Machine-Learning-Assisted Design of Novel TiZrNbVAl Refractory High-Entropy Alloys with Enhanced Ductility.

Author

Zhao, Xinyi, Wei, Zihang, Zhao, Junfeng, Jia, Yandong, Cao, Shuo, Wang, Dan, and Lei, Yucheng

Abstract

Refractory high-entropy alloys (RHEAs) typically exhibit excellent high-temperature strength but limited ductility. In this study, a comprehensive machine learning strategy with integrated material knowledge is proposed to predict the elongation of TiZrNbVAl RHEAs. By referring to the ductility theories, a set of cost-effective material features is developed with various mathematical forms of thermodynamic parameters. These features are proven to effectively incorporate material knowledge into ML modeling. They also offer potential alternatives to those obtained from costly first-principles calculations. Based on Pearson correlation coefficients, the linear relationships between pairwise features were compared, and the seven key features with the greatest impact on the model were selected for ML modeling. Regression tasks were performed to predict the ductility of TiZrNbVAl, and the CatBoost gradient boosting algorithm exhibiting the best performance was eventually selected. The established optimized model achieves high predictive accuracies exceeding 0.8. These key features were further analyzed using interpretable ML methods to elucidate their influences on various ductility mechanisms. According to the ML results, different compositions of TiZrNbVAl with excellent tensile properties were prepared. The experimental results indicate that Ti44Zr24Nb17V5Al10 and Ti44Zr26Nb8V13Al9 both exhibited ultimate tensile strengths of approximately 1180 MPa and elongations higher than 21%. They verified that the ML strategy proposed in this study is an effective approach for predicting the properties of RHEAs. It is a potential method that can replace costly first-principles calculations. Thermodynamic parameters have been shown to effectively predict alloy ductility to a certain extent. [ABSTRACT FROM AUTHOR]

Published
2024
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39. Investigation of arc stability, microstructure evolution and corrosion resistance in underwater wet FCAW of duplex stainless steel

Author

Li Hongliang, Duo Liu, Lei Yucheng, Pengfei Wang, Shixiong Liu, Chuncheng Luo, and Ma Qiang

Subjects
Austenite, Materials science, Mining engineering. Metallurgy, Metallurgy, Metals and Alloys, Arc stability, TN1-997, Underwater wet welding, Welding, Microstructure, FCAW, Surfaces, Coatings and Films, law.invention, Corrosion, Biomaterials, law, Ferrite (iron), 2205 duplex stainless steels, Ceramics and Composites, Grain boundary, Arc welding, Welding quality, Base metal
Abstract

Underwater wet flux-cored arc welding (FCAW) process was used to join 2205 duplex stainless steel using Ni-based filler under three different heat inputs of 16.9 kJ/cm, 23.5 kJ/cm and 32 kJ/cm. The arc stability, microstructure and corrosion resistance with different heat inputs were studied. The results showed that the welding process at the heat input of 23.5 kJ/cm was stable with less spatter and good weld appearance. The weld width, weld penetration and dilution ratio increased with increasing heat input. A single-phase austenitic microstructure was obtained for all welds with varied parameters. The heat-affected zone consisted of coarse ferrite and austenite in grain boundary. The grain size of weld zone and heat-affected zone coarsened as the heat input rose. Compared with the base 2205 base metal, the hardness of HAZ increased about 15% while the weld metal changed little. Electrochemical test in 3.5% NaCl solution indicated that the corrosion resistance of the weld metal under high heat input was better, but its corrosion resistance was inferior to that of base materials. Weld metal obtained at 23.5 kJ/cm possessed comprehensive properties in terms of arc stability and corrosion resistance. These results are helpful to promote the application of duplex stainless steel in the fields of nuclear power fields.

Published
2021

41. Identifying the influence of the ultrasonic-arc technique on the He+ irradiation damage resistance of CLAM steel TIG welds.

Author

Qiao, Yongfeng, Butt, Hassaan Ahmad, Lei, Yucheng, Yao, Yiqiang, Wang, Zeyu, and Chen, Hao

Subjects
STEEL welding, GAS tungsten arc welding, NANOINDENTATION, DISLOCATION loops, WELDING defects, ATOMIC force microscopy, HELIUM
Abstract

To explore the influence of the ultrasonic-arc technique on irradiation damage and irradiation hardening of China Low Activation Martensitic (CLAM) steel welds, Tungsten Inert Gas (TIG) welding and ultrasonic-arc TIG welding samples were exposed to He+ radiation at room temperature. Characterization included atomic force microscopy, scanning electron microscopy, grading incident X-ray diffraction, transmission electron microscopy, tensile testing and nano-indentation. After ion irradiation, various micro-defects were produced in the two weld metals. Compared with TIG weld metal, the number of defects in UA-TIG weld metal is reduced. The average diameter of helium bubbles in the UA-TIG weld metal decreased from 2.25 to 1.96 nm, the diameter of dislocation loops decreased from 8–25 nm to 5–21 nm, and the maximum load of nanoindentation decreased from 134.34 to 103.37 mN. The results show that the ultrasonic-arc TIG process is an effective method to refine the weld grain structure and improve irradiation damage and hardening resistance of CLAM steel welds. [ABSTRACT FROM AUTHOR]

Published
2023
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