Effect of Intermediate Cu-layer on Mechanical Properties of Welded Joints of TA1/X65 Composite Plate

doi:10.11901/1005.3093.2017.215

Chinese Journal of Materials Research

2018, Vol. 32

Issue (2): 81-89 DOI: 10.11901/1005.3093.2017.215

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Effect of Intermediate Cu-layer on Mechanical Properties of Welded Joints of TA1/X65 Composite Plate

Min ZHANG(

), Xiaowei WANG, Ting HAN, Tao ZHANG, Erlong MU

College of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

Cite this article:

Min ZHANG, Xiaowei WANG, Ting HAN, Tao ZHANG, Erlong MU. Effect of Intermediate Cu-layer on Mechanical Properties of Welded Joints of TA1/X65 Composite Plate. Chinese Journal of Materials Research, 2018, 32(2): 81-89.

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Abstract

Two explosively formed composite plates TA1/X65 and TA1/Cu/X65 were welded with flux cored wire of Cu-Ag-Mo-Nb. Then the effect of the intermediate Cu-layer on the microstructure, element distribution, and mechanical property of the butt welding joints are investigated by means of SEM, EDS and mechanical tester. The results show that the two types plates could be well connected by butt welding, and there exist obvious gray transition zones at the interfaces of titanium, steel and the formed transition layer, but no pores, inclusions, cracks and other defects in the weld joints were observed. According to the analysis of SEM, EDS and XRD, the TiFe-phase in the triangle area of the plate TA1/X65 is inevitable. The Cu-layer within of the plate TA1/Cu/X65 can effectively prevent the mutual diffusion of Ti and Fe, thus the diffusion of Ti and Fe onto the transition zone decreased significantly, as a result, the Fe-content in the weld titanium and the Ti-content in the weld steel has also been significantly reduced. Therefore, the weld composite plate TA1/Cu/X65 exhibits better mechanical properties rather than the plate TA1/X65 without Cu-layer in terms of tensile strength, bending modulus and impact strength.

Key words: composite flux cored wire microstructure three-layer composite plate distribution of element mechanical property

Received: 29 March 2017

ZTFLH:

TG422

Fund: Supported by National Natural Science Foundation of China (No. 51274162), Department of Education to Serve Local Special Program of Shaanxi Province (No. 16JF021), and Key Laboratory Research Program of Shaanxi Provincial Department of Education (No. 15JS082)

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	Min ZHANG
	Xiaowei WANG
	Ting HAN
	Tao ZHANG
	Erlong MU

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https://www.cjmr.org/EN/10.11901/1005.3093.2017.215 OR https://www.cjmr.org/EN/Y2018/V32/I2/81

Fig.1 The schematic of the two-layer plate groove

Fig.2 The schematic of the three-layer plate groove

Table 1 welding process parameters

Fig.3 Morphology of the Cu-Ag-Mo-Nb flux-cored wire welded joint (a) welding macroscopic of two-layer plate, (b) morphology of bonding interface of transition layer and titanium layer, (c) morphology of three-phase mixed zone on the right side of welded joint

Fig.4 XRD pattern of the cross-section of the Cu-Ag-Mo-Nb flux-cored wire welded joint

Table 2 EDS result of welding (atomic fraction, %)

Fig.5 Welding joint scan of three-layer plate (a) welding macroscopic of three-layer plate, (b) morphology of four-phase mixed zone on the right side of welded joint, (c) morphology of bonding interface of transition layer and steel layer, (d) morphology of bonding interface of transition layer and titanium layer

Fig.6 XRD pattern on the surface in the weld

Table 3 Chemical composition of the various phases in the weld (atomic fraction, %)

Table 4 Tensile test results of butt joint of composite plate

Fig7 Bend test results

Fig.8 Impact test results

Fig.9 Macro morphology of bending specimens (a) face bending of two-layer; (d) back bending of three-layer; (b) back bending of two-layer; (c) face bending of three-layer

Fig.10 Fracture morphology of tensile specimen (a) titanium weld of two-layer; (b) transition layer of two-layer; (c) titanium weld of three-layer; (d) transition layer of three-layer

Fig.11 Fracture morphology of impact specimen (a) transition layer of two-layer; (b) titanium weld of two-layer; (c) transition layer of three-layer; (d) titanium weld of three-layer

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