Zhuguo Li

Shanghai Jiao Tong University

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Kai Feng

China Agricultural University

Fenggui Lu

Shanghai Jiao Tong University

Yixiong Wu

Xiamen University of Technology

Jian Huang

Shanghai Jiao Tong University

Chengwu Yao

Shanghai Jiao Tong University

Pulin Nie

Shanghai Jiao Tong University

Paul K. Chu

City University of Hong Kong

Hiroyuki Kokawa

Tohoku University

Junhao Sun

Tianjin University

Ke Zhang

Research Institute of Petroleum Exploration and Development

Cooperative Institutions

Shanghai Jiao Tong University

200

Chinese Academy of Sciences

Collaborative Innovation Centre for Advanced Ship and Deep-Sea Exploration

Huazhong University of Science and Technology

Zhejiang University

Tsinghua University

Harbin Institute of Technology

Southern Medical University

Sichuan University

Sun Yat-sen University

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Influence of in-situ synthesized carboborides on microstructure evolution and the wear resistance of laser clad Fe-base composite coatings

Materials Characterization (2020)

Yulei Feng Chengwu Yao Chen Shen Yueqiao Feng Kai Feng

Boron carbide

10.1016/j.matchar.2020.110326

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Citations (17)

Interfacial Microstructure and Strengthening Mechanism of Dissimilar Laser Al/Steel Joint Via a Porous High Entropy Alloy Coating

Min Zheng Jin Yang Jiayi Xu Jiawei Jiang Hua Zhang

A novel porous high entropy alloy (HEA) coating was prepared on the steel surface by vacuum sintering. The coating was then used as a transition layer during dissimilar laser Al/steel joining. Compared with the uncoated laser joints, the liquid alloy spread and infiltrated into porous structure, the contact angle of the weld reduced from 65.8 ° to 56.7°, and the brazed width increased from 5.1 mm to 5.9 mm, which improved the wettability and spreadability of the molten filler wire on the substrate. In the case of uncoated steel, the fusion zone/steel interfacial microstructure consisted of laminated Al7.2Fe1.8Si and Fe(Al,Si)3, while it changed to a composite-like structure containing a soft HEA skeleton and hard IMCs which was composed of Al7.2Fe1.8Si, Al3Ni, and (Al,Si)2Cr. In addition, due to the sluggish diffusion effect of HEAs, a layer of gradient nanocrystalline composed of Al7.2Fe1.8Si was generated, which significantly strengthened the dissimilar laser joints with improved both the fracture load (~26.5%) and the displacement (~101.8%). The fracture mode changed from brittle to ductile failure when the porous HEA coating was applied, with fracture propagating through the HEA skeleton. This work provides a novel solution for the strengthening of hard-to-join dissimilar combinations.

10.2139/ssrn.4333724

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Silver implanted 316L stainless steel as bipolar plates in polymer electrolyte membrane fuel cells

Materials Chemistry and Physics (2010)

Kai Feng Zhuguo Li Xun Cai Paul K. Chu

Passivation

Austenitic stainless steel

Contact resistance

10.1016/j.matchemphys.2010.11.029

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Citations (42)

High entropy alloys amenable for laser powder bed fusion: a thermodynamics guided machine learning search

Additive manufacturing (2024)

Ran Duan Jintao Xu Yakai Zhao Qingjun Zhou Zhen Yan

Process window

High-Entropy Alloys

10.1016/j.addma.2024.104195

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Citations (5)

Effect of Gd on Microstructure and Properties of Laser Clad Magnesium Coatings

Chinese Journal of Lasers (2015)

陈宏 Chen Hong Zhuguo Li 姚成武 Yao Chengwu 吴毅雄 Wu Yixiong

10.3788/cjl201542.0306002

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Citations (1)

Microstructure and Water Erosion Resistance Property of Stellite6 Coating by Laser Cladding on 17-4PH Stainless Steel Surface

Chinese Journal of Lasers (2017)

任超 Ren Chao Zhuguo Li Da Shu 赵文雨 Zhao Wenyu 杨仁杰 YANG Ren-jie

Cladding (metalworking)

10.3788/cjl201744.0402010

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Origin of the anisotropic ductility and the dynamic recrystallization-like deformation behavior of laser powder bed fusion Inconel 625 at elevated temperature

Scripta Materialia (2022)

Jie Zhu Chendong Shao Fenggui Lu Kai Feng Pan Liu

Dynamic Recrystallization

Deformation mechanism

Deformation bands

Recrystallization (geology)

Inconel

10.1016/j.scriptamat.2022.114945

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Citations (8)

Effect of Heat Treatment on the Anisotropic Mechanical Properties and Corrosion Resistance of Laser Powder Bed Fusion Fabricated Inconel 625

Jie Zhu Kai Feng Hiroyuki Kokawa Zhuguo Li

The microstructure evolution of laser powder bed fusion processed Inconel 625 after heat treatment at 650 ℃ (aging), 850 ℃ (sensitization) and 1050 ℃ (homogenization) was studied. Relationship of microstructure evolution and the anisotropic mechanical properties and corrosion resistance was analyzed. Decreased corrosion resistance after aging and sensitization was observed, which is related to the different precipitation behavior. After aging, γ″ and MC carbides precipitated along cellular structures further accelerate the corrosion along melting pool boundaries. While after sensitization, δ precipitated along cellular structures aggravated the corrosion along the melting pool boundaries. At the meantime, precipitation of M23C6 carbides and δ along grain boundaries made it vulnerable to be corroded, which further accelerate the corrosion rate. After homogenization, segregation and precipitates are barely observed in the microstructure which contribute to an enhancement of corrosion resistance. Moreover, with the increasing of heat treatment temperature, recovery of cellular structures contributes to the decrease of the anisotropy of mechanical properties. This study may contribute to the profound comprehension of heat treatment procedure on microstructure evolution as well as mechanical properties and corrosion resistance of LPBFed IN625.

Inconel 625

Inconel

10.2139/ssrn.4653893

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Ultrahigh Hardness Coating with Excellent Crack Resistance Achieved by Ultrafine Eutectic

Metallurgical and Materials Transactions A (2022)

Yulei Feng Xiaotong Pang Yueqiao Feng Zhuguo Li

Cladding (metalworking)

Dendrite (mathematics)

10.1007/s11661-022-06671-9

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Citations (1)

Liquid vortexes and flows induced by femtosecond laser ablation in liquid governing formation of circular and crisscross LIPSS

Opto-Electronic Advances (2022)

Dongshi Zhang Xinzhuo Li Yao Fu Qing Yao Zhuguo Li

Orientations of laser induced periodic surface structures (LIPSS) are usually considered to be governed by the laser polarization state. In this work, we unveil that fluid dynamics induced by femtosecond (fs) laser ablation in liquid (fs-LAL) can easily break this polarization restriction to produce irregular circular-LIPSS (CLIPPS) and crisscross-LIPSS (CCLIPSS). Fs laser ablation of silicon in water shows formation of diverse LIPSS depending on ablation conditions. At a high power of 700 mW (repetition rate of 100 kHz, pulse duration of 457 fs and wavelength of 1045 nm), single/twin CLIPSS are produced at the bottom of macropores of several microns in diameter due to the formation of strong liquid vortexes and occurrence of the vortex shedding effect. Theoretical simulations validate our speculation about the formation of liquid vortex with an ultrahigh static pressure, which can induce the microstructure trenches and cracks at the sidewalls for fs-LAL of Si and tungsten (W) in water, respectively. At a low power of 50 mW, weak liquid vortexes are produced, which only give birth to curved LIPSS in the valleys of grooves. Consequently, it is deduced that liquid vortex plays a crucial role in the formation of macropores. Mountain-like microstructures induce complex fluid dynamics which can cause the formation of CCLIPSS on them. It is believed that liquid vortexes and fluid dynamics presented in this work open up new possibilities to diversify the morphologies of LIPSS formed by fs-LAL.

Laser Ablation

10.29026/oea.2022.210066

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Citations (32)