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Materials 2018, 11(7), 1153;

Electro-Superplastic Solid State Welding of 40Cr/QCr0.5

1,* , 1,2,* and 1,3
School of Materials Science and Engineering, Henan University of Science & Technology, Luoyang 471003, China
Research Center for High Purity Materials, Henan University of Science & Technology, Luoyang 471003, China
Collaborative Innovation Center of Nonferrous Metals, Luoyang 471023, China
Authors to whom correspondence should be addressed.
Received: 2 May 2018 / Revised: 29 June 2018 / Accepted: 3 July 2018 / Published: 6 July 2018
(This article belongs to the Section Manufacturing Processes and Systems)
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Hot-squeezed chrome bronze QCr0.5 and ultra-fine treated 40Cr steel have been successfully welded using an electro-superplastic solid-state welding technique. Results have shown that the tensile strength of a 40Cr/QCr0.5 weld joint can be greatly increased, up to or exceeding that of QCr0.5 base metal. The weld interface between 40Cr and QCr0.5 has achieved metallurgical bonding and there are less micro-gaps, thicker transition regions and more copper convexes and dimples on the fracture surface of the 40Cr side when applying an external electrical field of E = 3 kV/cm, as well as with other welding parameters, including no vacuum, no shield gas, a pre-pressure of 56.6 MPa, an initial strain rate of 1.5 × 10−4 s−1, a pressure welding temperature of 710–800 °C, and a pressure welding time of 0–8 min. View Full-Text
Keywords: copper alloys; steel; electro-superplastic solid-state welding; strength; metallurgical bonding copper alloys; steel; electro-superplastic solid-state welding; strength; metallurgical bonding

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Wang, Y.; Wang, G.; Zhang, K. Electro-Superplastic Solid State Welding of 40Cr/QCr0.5. Materials 2018, 11, 1153.

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