Study of a Bimetallic Interfacial Bonding Process Based on Ultrasonic Quantitative Evaluation

Abstract

The interfacial bonding process and mechanical properties of AISI (American Iron and Steel Institute) stainless steel/Q235A carbon steel were investigated by deformation bonding, heat preservation, and tensile tests. The results reveal that the deformation temperature has a beneficial effect on the bonding rate, and that the critical temperature for the large-area bonding of stainless steel and carbon steel is approximately 700 • C. However, owing to the short contact time, only a shallow diffusion of approximately 2-3 µm can be achieved. A slight decrease in the interfacial bonding rate after heat preservation is correlated to the difference between the thermal expansion coefficients of the two materials, but the thickness of the diffusion layer shows a significant increase. It was found that the strength of the composites is mostly related to the bonding rate and the strength of the relatively soft material, which can be determined using an explicit equation. Moreover, with the increase in the interfacial bonding rate, the crack source changes from the junction of the unbonded and bonded areas of the interface to the interior of the carbon steel. The failure mode evolves from cleavage brittle fracture to ductile-brittle mixed-mode fracture, and then to ductile fracture.

Multiscale Comparison Study of Void Closure Law and Mechanism in the Bimetal Roll-Bonding Process

“…The following specific conclusions were drawn. (1). At the macro-scale, the closure rate of voids decreases with the increase of the real contact area between interfaces.…”

“…As the pressure increases, the plastic deformation of the metal in the interface region causes the voids to shrink into circular or elliptical shapes, and finally, the voids disappear completely. The bonding rate is an important index for evaluating the interfacial bonding quality of composites [1]. The bonding rate values at various pressures are shown in Figure 4.…”

“…Next, to study the deformation process of rough peaks and the mechanism of void closure, the macro-scale finite element model and the micro-scale molecular dynamics model, respectively, were established. The bonding rate is an important index for evaluating the interfacial bonding quality of composites [1]. The bonding rate values at various pressures are shown in Figure 4.…”

“…Austenitic stainless steel, exhibiting good corrosion resistance at high temperatures, is widely used in the petrochemical industry, aviation, shipping, as well as other industries. Because the price of stainless steel is more expensive, it is more economical to use composite materials of stainless steel and low carbon steel in engineering applications [1]. Roll-bonding is an efficient solid-phase joining method for the industrial production of bimetallic products [2].…”

Evaluation of the Bond Quality of Metal-Clad Plates Using Laser Ultrasonic Local Resonance

“…Among them, stainless/carbon steel-clad plates are the most widely used product [1][2][3][4][5]. Generally, a stainless/carbon steel-clad plate takes carbon steel as the matrix and stainless steel as the coating, which gives consideration to the beautiful appearance and corrosion resistance of the stainless steel and the advantages of the high strength of the carbon steel [6][7][8][9]. Due to the uncertainty in the production process and the effect of the working load and the environment in the service process, the delamination defects of stainless/carbon steel-clad plates are inevitable, which may eventually reduce the life of the structure and even lead to safety accidents.…”