Microstructure and Mechanical Properties of Galvanized-45 Steel/AZ91D Bimetallic Material by Liquid-Solid Compound Casting

Abstract

A connection between hot-dip galvanized 45 steel and AZ91D was achieved by liquid-solid compound casting to achieve one material with a better mechanical performance and a light weight. The microstructure and properties of galvanized-steel/AZ91D bimetallic materials were investigated in this study. A scanning electron microscopy (SEM), an energy dispersive spectroscopy (EDS), and an X-ray diffraction (XRD) were applied to analyze the microstructure evolution and formation mechanism of the galvanized 45 steel/AZ91D interface zone which could be divided into three layers. Among three different layers, the layer close to AZ91D was composed of α-Mg and an eutectic structure (α-Mg + MgZn). The intermediate layer was comprised of an eutectic structure (α-Mg + MgZn), and the layer adjacent to 45 steel consisted of α-Mg and FeAl3. Furthermore, galvanized-45 steel/AZ91D bimetallic material had better shear strength than the bare-45 steel/AZ91D metallic material which can indicate that owing to the formation of metallurgical bonding, the adhesive strength of galvanized-steel and AZ91D was improved to 11.81 MPa. In addition, the fact that corrosion potential increased from −1.493 V to −1.143 V and corrosion current density changed from 3.015 × 10−5 A/cm2 to 1.34 × 10−7 A/cm2 implied that the corrosion resistance of galvanized-steel/AZ91D was much better than AZ91D.

Effect of Q235 Hot-Dip Galvanized and Post-Casting T6 Heat Treatment on Microstructure and Mechanical Properties of Interfacial between AZ63 and Q235 by Solid-Liquid Compound Casting

“…Therefore, it is difficult to form a metallurgical bonding between Mg and Fe. In recent years, there have been a number of reports on the solid-liquid composite casting of magnesium alloy and steel [11][12][13][14][15]. Sacerdote-Peronnet et al reported the effects of varying the degree of chemical interaction and specimen thickness on the load-displacement curves between mild steel and magnesium base Mg-Al alloy [11].…”

“…Moreover, Zinc coating on steel surface will promote the formation of low melting Mg-Zn eutectic, which can improve the weldability of AZ31 and steel [17]. Cheng et al and Jiang et al studied that the microstructure and mechanical properties of interfacial between AZ91D and 45 steel by solid-liquid composite casting with hot-dip galvanized and hot-dip aluminized 45 steel bars at 720 and 780 • C, respectively [12][13][14]. Zhao et al [15] systematically analyzed the microstructure and mechanical properties of the bonding interface of AZ91D/Al-coated 0Cr19Ni9 bimetal materials by using liquid-solid compound casting.…”

Atomic Research on the Diffusion Behavior, Mechanical Properties and Fracture Mechanism of Fe/Cu Solid–Liquid Interface

“…Over the last few years, high-strength and highly wear resistant bimetallic materials have been attracted worldwide attention and demonstrated important application prospects in aerospace, ships, automobiles, and other fields due to their excellent dual performance structure and the comprehensive high-strength and high wear resistance properties [1][2][3][4][5]. The steel-copper bimetallic materials are one of the typical representatives, combining the advantages of both steel (high strength and stiffness) and copper (high wear resistance), and have been used to fabricate military aerospace rotors [6].…”

Archives of Metallurgy and Materials

“…The stable joint is obtained through the melting of the filler metal fed near arc burning between the non-consumable tungsten electrode having the appropriately sharpened tip and the base material, or through the melting of the edges of elements being joined. During braze welding, the filler metal usually has the form of a braze or a special braze welding material, which, exposed to the high temperature of arc and that of the heated base material, undergoes melting and, next, forms the joint through diffusion [23][24][25][26][27]. The TIG heat source is characterised by a high arc temperature restricted within the range of 16000°K to 17000 °K and by the conical shape having an approximate angle of 50° [28][29].…”