Analyses on Connection Characteristics of Composites of Steel-Copper

doi:10.11901/1005.3093.2014.541

Chinese Journal of Materials Research

2015, Vol. 29

Issue (9): 693-700 DOI: 10.11901/1005.3093.2014.541

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Analyses on Connection Characteristics of Composites of Steel-Copper

Lintao CHEN Wenge HOU(

),Yingbin LIU,Qiwen LUO

School of Materials Science and Engineering, Xi’an University of Technology, Xi’an 710048 China

Cite this article:

Lintao CHEN Wenge HOU,Yingbin LIU,Qiwen LUO. Analyses on Connection Characteristics of Composites of Steel-Copper. Chinese Journal of Materials Research, 2015, 29(9): 693-700.

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Abstract

Composites 45 steel/T2 copper and 304 Stainless steel/T2 copper were prepared by high-temperature vacuum casting. The interface bonding strength, microstructure, microhardness and composition change of the phase boundary zone of the composites were investigated by SEM observation, EDS analysis, XRD and mechanical property test. The results show that interdiffusion occurred of alloy elements Fe, Cr and Cu of the two substrates resulting in formation of phases such as a new iron carbon compounds (CFe_15.1) and solid solution Cu_0.81 Ni_0.19, and Cr-Ni-Fe-C, there existed a dentate interdiffusion layer of about 60 to 70 microns without obvious intermetallics in the transition zone and its microhardness is about 183 and 119HV for 45-T2 and 304-T2 respectively; tensile/shear strength of the composite are 278/263MPa and 217/201 MPa respectively for 45/T2 and 304/T2; break occurs in the copper side with typical ductile fracture characteristics. Cu element plays an important role in improvement of the stability and strength of the substrates 304 stainless steel and 45steel.

Key words: composites 45 steel 304 Stainless T2 copper vacuum casting interface analysis

Received: 26 September 2014

Fund: *Supported by Xi'an Science and Technology Project No. CXY1342(2).

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https://www.cjmr.org/EN/10.11901/1005.3093.2014.541 OR https://www.cjmr.org/EN/Y2015/V29/I9/693

Table 1 Chemical composition of 45 steel、T2、304 (%, mass fraction )

Fig.1 Sample of tensile testing (a) and casting (b)

Fig.2 Microstructure of 45 steel and T2 copper composites before and after corrosion

Fig.3 Microstructure of 304-T2 composites before and after corrosion

Fig.4 Interface microstructure of 304-T2/45钢-T2 (a, b) and line spectrum diagram of interface elements (c, d)

Fig.5 XRD pattern of fracture between 45-T2 (a) and 304-T2 composites (b)

Fig.6 stress-strain curve of Steel and copper in under the tensile (a) and the shear (b) stress-strain

Fig.7 Microhardness of 45-T2/304-T2 composites

Fig.8 Distribution curve of steel copper composites interface microhardness

Fig.9 Shear fracture SEM morphology of 45 steel-T2 copper (a, b) and 304 Stainless-T2 copper (c, d)

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