Junfeng Gou

Guangdong University of Technology

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You Wang

Temper (United States)

Jiangwen Liu

Guangdong University of Technology

Saiyue Liu

Harbin Institute of Technology

Feifei Zhou

Harbin Institute of Technology

Chaohui Wang

Qiqihar University

Guan Wang

Ningxia University

Yongkang Zhang

Pingdingshan University

Qiwen Zhang

Baoji University of Arts and Sciences

Yongkang Zhang

Guangdong University of Technology

Chaohui Lin

Guangdong University of Technology

Cooperative Institutions

Guangdong University of Technology

Harbin Institute of Technology

Chinese Academy of Sciences

Hebei University of Technology

Central South University

Xi'an Jiaotong University

University of Chinese Academy of Sciences

Tsinghua University

Northwestern Polytechnical University

Wuhan University of Technology

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Research on Morphology, Porosity, Mechanical Properties of 7075 Aluminum Alloy Repaired by Arc Welding and Laser Shock Forging

Zhichao Chen Yongkang Zhang Yuanqing Chi Junfeng Gou Chaohui Lin

There are many problems in arc welding repair of aluminum alloy parts, such as excessive pores, coarse grains, and low hardness. Introducing external energy excitation is an effective solution. In this paper, 7075 aluminum alloy parts are repaired by arc welding - laser shock forging. The effects of laser-wire spacing, laser pulse energy and frequency, welding current and speed, V-groove depth on surface morphology, section geometric characteristics and porosity of repaired layer are studied, hardness and microstructure of repaired layer formed by arc welding - laser shock forging and arc welding are compared. The results show that a fine surface morphology of repaired layer will be obtained by selecting the reasonable laser-wire spacing, welding current, welding speed and V-groove depth, and selecting maximum laser pulse energy and frequency as possible, so as to increase aspect ratio, reduce residual coefficient, reduce porosity and maximum pore diameter of the repaired layer. Compared with arc welding, arc welding - laser shock forging can reduce grain size and improve hardness of the repaired layer.

Groove (engineering)

Plasma arc welding

10.2139/ssrn.4449003

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Citations (0)

Effect of rare earth oxide nano-additives on the corrosion behavior of Fe-based hardfacing alloys in acid, near-neutral and alkaline 3.5 wt.% NaCl solutions

Applied Surface Science (2017)

Junfeng Gou You Wang Xuewei Li Feifei Zhou

Hardfacing

10.1016/j.apsusc.2017.06.203

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Citations (20)

Effects of TiC on the Microstructure, Mechanical Properties, and Wear Behavior of E690 Steel Prepared by Laser Cladding

Tribology Transactions (2023)

Qingtian Yang Guohua Chen Tong Li Jiangwen Liu Junfeng Gou

For this study, E690 steel claddings with different contents of TiC were prepared by laser cladding for revealing effects of TiC on microstructure, mechanical properties, and wear behavior of the cladded steel. The microstructure and mechanical properties of the cladded alloys were observed and measured. The wear resistance of the cladded alloys was tested using a ball-on-disc tribometer. The experimental results showed that TiC refined the grain of the cladded alloy obviously. However, excessive TiC could lead to the network-like distribution of submicro TiC particles in the claddings. The microhardness of the cladded alloy with 1% TiC increased to 418.5 ± 10.7 HV500, and yield strength and ultimate tensile strength (UTS) increased by 11% and 7% compared with those of the cladded alloy without TiC. Excessive TiC decreased the tensile properties to an obvious degree. The addition of TiC improved the wear resistance of the cladded alloy significantly. When normal loads were 5 N and 10 N, the cladded alloy with 5% TiC exhibited high wear resistance, and the wear rates decreased by 59% and 78% compared with those of the cladded alloy without TiC. However, when normal load was 20 N, the cladded alloy with 1% TiC possessed superior wear resistance, and its wear rate decreased by 81% compared with that of the cladded alloy without TiC. The main wear mechanism of the cladded alloys was abrasion wear when normal load was low, but serious plastic deformation played a role in the wear process when normal load was high.

Cladding (metalworking)

10.1080/10402004.2023.2275680

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Citations (1)

Thermal cycling behavior of nanostructured 8YSZ，SZ/8YSZ and 8CSZ/8YSZ thermal barrier coatings fabricated by atmospheric plasma spraying

Ceramics International (2016)

Feifei Zhou You Wang Zhongyuan Cui Liang Wang Junfeng Gou

Temperature cycling

10.1016/j.ceramint.2016.12.014

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Citations (59)

Effect of Nano-Si3N4 Additives and Plasma Treatment on the Dry Sliding Wear Behavior of Plasma Sprayed Al2O3-8YSZ Ceramic Coatings

Journal of Thermal Spray Technology (2017)

Junfeng Gou Jian Zhang Qiwen Zhang You Wang Chaohui Wang

10.1007/s11666-017-0540-y

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Citations (11)

Microstructure and properties of molybdenum composite coatings by plasma spraying of Mo–SiC and MoO3–Al–SiC composite powders

Ceramics International (2023)

Yanwei Wang Yong Yang Xingyu Wang Wei Li Junfeng Gou

10.1016/j.ceramint.2023.11.042

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Citations (5)

Preparation and corrosion resistance of chromium-free Zn-Al coatings with two different silane coupling agents

Surface and Coatings Technology (2019)

Junfeng Gou Guan Wang Yuelin Ning Lei Guan Yongkang Zhang

Methyltrimethoxysilane

Diffractometer

10.1016/j.surfcoat.2019.03.020

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Citations (14)

Fabrication of high accuracy micro-hole by micro-EDM under tool electrode spiral motion feed mode aided with fixed reference axial compensation

Research Square (Research Square) (2022)

Junfeng Gou Jingyun Lai Haoran Lin K.C. Chan T.M. Yue

Abstract The accumulation of debris in the inter-electrode gap caused by inefficient flushing during the micro-electrical discharge machining (micro-EDM) process leads to severe tool electrode wear and decreases the machining accuracy of micro-holes. In this study, a novel method of tool electrode spiral motion feed mode combined with fixed reference axial compensation (FRAC) is proposed to promote the evacuation of debris and improve the machining accuracy of micro-holes. Different depths of micro-holes in titanium alloy are drilled using the tool electrode linear feed mode and tool electrode spiral motion feed mode combined with FRAC and without compensation. The process parameters are optimized and determined by means of response-surface experiments. The results show that the tool electrode spiral motion feed mode can improve the debris evacuation more effectively than the tool electrode linear feed mode. The micro-hole without a cone at the bottom can be fabricated using the tool electrode spiral motion feed mode. The introduction of FRAC method can improve the depth error of micro-holes further. A high accuracy micro-hole with a depth error of only 0.21% can be fabricated efficiently under the optimal process parameters. The tool electrode spiral motion feed mode combined with FRAC has an obvious advantage in the fabrication of high accuracy micro-holes during the micro-EDM process.

Electrical Discharge Machining

10.21203/rs.3.rs-1716212/v1

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Citations (0)

Effect of nano-additives on microstructure, mechanical properties and wear behaviour of Fe⿿Cr⿿B hardfacing alloy

Applied Surface Science (2015)

Junfeng Gou Pengpeng Lü You Wang Saiyue Liu Zhiwei Zou

Hardfacing

10.1016/j.apsusc.2015.11.076

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Citations (21)

A study on the scratch behavior and two-body abrasion wear resistance of TiC-modified E690 steel cladding