Effect of annealing temperature on microstructure and mechanical properties of silver layer in silver/steel composite plate fabricated by explosive welding

doi:10.13251/j.issn.0254-6051.2023.08.025

Abstract

Abstract: Silver/steel composite plate with typical explosive wavy bonding interface was fabricated by explosive welding. Under the same holding time, the effect of different annealing temperatures on structure and microhardness of the silver layer and the interface shear strength of the composite plate interface was studied. The results show that there is a mixture of Ag and Fe in the wavy vortex zone generated by explosive welding, and a temperature gradient is generated in the vortex zone during the heat treatment cooling process, which makes the silver layer present a columnar grain growth mode during recrystallization. As the annealing temperature increases, the diffusion of Ag and Fe atoms intensifies within the vortex zone, leading to the disappearance of temperature gradients and the uniform growth of silver layer grains towards the surrounding areas. The hardness of the silver layer reaches its maximum around 90 HV0.1 in the explosive state. When the annealing temperature exceeds 200 ℃, the hardness of the silver layer decreases by 36% and its sensitivity to the annealing temperature decreases, with the average hardness remaining around 60 HV0.1. The interface shear strength of the composite plate reaches the maximum 238 MPa under the explosive state. With the increase of annealing temperature, the shear strength decreases. When the temperature reaches 500 ℃, the shear strength remains stable at about 150 MPa, which is 37% lower than that of the explosive state.

Key words: explosive welding, silver/steel composite plate, heat treatment, interface microstructure

CLC Number:

TG456.6

Zhu Lei, Wei Yibin. Effect of annealing temperature on microstructure and mechanical properties of silver layer in silver/steel composite plate fabricated by explosive welding[J]. Heat Treatment of Metals, 2023, 48(8): 154-160.

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