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Providing a new perspective for obtaining high-quality metal coatings: fabrication and properties studies of TA2 foil on Q235 steel by explosive welding

Xu Junfeng, Yang Ming, Chen Daiguo, Ma Honghao, Shen Zhaowu, Zhang Bingyuan, Tian Jie

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 3

565--575

In this work, an improved explosive welding technique was introduced to obtaining high-quality metal coatings, where titanium (TA2) foils with different thicknesses of 0.1, 0.2, 0.3, and 0.4 mm were successfully coated on Q235 steel. Systematic investigations of the achieved claddings were conducted using macro- and micro-morphology observations, EDS elemental analyses, mechanical tests (three-point bending and nanoindentation), and electrochemical measurements. It was concluded that the explosive welding technique was an effective way to produce high-quality TA2 coatings. In both morphological analyses and mechanical tests, an excellent bonding quality was confirmed for the cases of TA2 foils with a thickness of greater than 0.1 mm. Meanwhile, the welding window was proved still being practical for predicting the bonding interface characteristics in the explosive welding of the metal foil. The EDS analyses and nanoindentation tests signified inhomogeneous properties of the materials near the bonding interface due to shock-induced work hardening and the formation of molten zone. Eventually, TA2 foil coatings were certified by electrochemical measurement to remarkably enhance the corrosion resistance of the Q235 substrate.

Study on modalities and microdefects of Al-Cu bimetallic tube by underwater explosive cladding

Yu Yong, Xu Peibao, Li Kai, Zhao Jun, Dai Yuntong, Ma Honghao, Yang Ming

Archives of Civil and Mechanical Engineering

2019

Vol. 19, no. 4

1390--1398

In this study, a screwed copper tube was cladded an aluminum tube by a new explosive cladding method. To study the modalities of the bonding interface, a light microscope was used to observe the bonding interface. To expose the weak position of the interface, a three-point bending test was conducted under extreme condition. Then the BSE (Backscattering Electron) images of the bent interfaces were obtained. Meanwhile, the EDS (Energy Disper-sive Spectrometry) analyses of the melted zone were performed. The results of the light microscopic observations show that there are four bonding modalities on the interface. They can be summarized to two bonding modalities: direct bonding and bonding with the melted zone. There are no macro cracks on the interface of the bent specimens, which represents a reliable joining generally. The elastic modulus of Al-Cu bimetallic tube along the axial direction is 85.2Gpa. The BSE images, the EDS analyses and the microhardness tests show the direct bonding with some characteristics of the micro wavy interface is a pretty nice bonding pattern. The melted zone composed of CuAl2 is a weak bonding pattern, which may affect the mechanical property of the joint.