Article ID Journal Published Year Pages File Type
1581649 Materials Science and Engineering: A 2009 4 Pages PDF
Abstract

To investigate the feasibility of isothermal superplastic solid-state welding of 40Cr steel and QCr0.5, ZQSn6-6-3 copper alloys, the welded surface of 40Cr steel surface is ultra-fined through laser quenching, and then the welding process tests between different base metals of 40Cr and QCr0.5, ZQSn6-6-3 are made under vacuum-free condition. The experimental results show that, under the pre-pressed stress of 56.6–84.9 MPa, at the welding temperature of 750–800 °C and at initial strain rate of (2.5–7.5) × 10−4 s−1, the superplastic solid-state welding can be finished in 2–4 min. The strength of the joints is up to that of QCr0.5 base metal or close to that of ZQSn6-6-3 base metal and the expansion rate of the joints is below 6%. The plastic deformation of the joint is further analysed. The superplastic deformation of the copper alloys occurs in welding process and the deformation of 40Cr steel is limited.

Related Topics
Physical Sciences and Engineering Materials Science Materials Science (General)
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