Effect of Stretch-Bending Straightening on the Residual Stress of C19400 Alloy Strips

The effect of annealing time on the bending properties and microstructure of cold-rolled C19400 alloy was studied by transmission electron microscopy, scanning electron microscopy, and optical microscopy. With the increase in annealing time, the bending properties of the alloy first increased and then decreased, and the elongation increased from 8.33% in cold-rolled state to 11.58% after annealing for 60 min, which increased by 39.02%, and then decreased to 10.0% after annealing for 90 min. Within the experimental range, the bending performance is the best when the annealing time is 60 min. When the relative bending radius is 0.4, the outer surface of the bending part of the alloy changes from a large number of microfine cracks before annealing to the disappearance of cracks after annealing. The analysis shows that the decrease in the dislocation density, the ordering of the dislocation structure, and the refinement of the precipitated phase are the keys to improving the bending performance of the strip after annealing.

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Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys

Wang

Chen

Guo

et al. 2023

Metals

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CuNiSi alloys are widely used for lead frames and connectors due to the combination of high strength and high electrical conductivity. In this work, the microstructures, properties and precipitation behaviors of cryo-rolled CuNiSi alloys with different Cr additions were investigated. The results show that the microstructures of cryo-rolled CuNiSi alloys are mainly composed of nano-sized deformation twins. During aging, discontinuous precipitation gradually takes the place of continuous precipitation with the onset of recrystallization. The addition of chromium reacts to form Cr3Si particles and facilitates the formation of lamellar structures in the cryo-rolled states of CuNiSi alloys. Moreover, both the recrystallization and the discontinuous precipitation of cryo-rolled CuNiSi alloys are hindered by the addition of Cr elements. As a result, the mechanical strength of cryo-rolled CuNiSi alloys after aging can be maintained. The best combination of properties obtained in the CuNiSi-0.15Cr alloy is 761 MPa, 6.1% and 48.4% IACS in ultimate strength, elongation and electrical conductivity, respectively.

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Effect of Stretch-Bending Straightening on the Residual Stress of C19400 Alloy Strips

Cited by 3 publications

References 24 publications

The influence of tensile stress on the strength and residual stress of C19400 alloy under ultrasonic vibration treatment

The influence of tensile stress on the strength and residual stress of C19400 alloy under ultrasonic vibration treatment

Effect of annealing time on bending performance and microstructure of C19400 alloy strip

Effects of Cr Addition on the Precipitation and Properties of Cryo-Rolled CuNiSi Alloys

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