Abstract
A bimetal composite of 2205 duplex stainless steel and AZ31B magnesium alloy was cladded successfully through the method of explosive welding. The microstructural characteristics and mechanical properties of 2205/AZ31B bimetal composite are discussed. The interface of 2205/AZ31B bimetallic composite was a less regular wavy morphology with locally melted pockets. Adiabatic shear bands occurred only in the AZ31B side near explosive welding interface. The microstructure observed with EBSD showed a strong refinement near the interface zones. Line scan confirmed that the interface had a short element diffusion zone which would contribute to the metallurgical bonding between 2205 duplex stainless steel and AZ31B magnesium alloy. The value of micro-hardness near the bonding interface of composite plate increased because of work hardening and grain refinement. The tensile shear strength of bonding interface of 2205/AZ31B composite was 105.63 MPa. Tensile strength of 2205/AZ31B composite material was higher than the base AZ31B. There were two abrupt drops in stress in the stress–strain curves of the 2205/AZ31B composite materials.
Highlights
Bimetal composites can utilize the advantages of two materials, obtaining a property that a single metal cannot satisfy
Tensile strength of 2205/AZ31B composite material was higher than the base AZ31B
We know that Fe and Mg elements are incompatible according to Mg-Fe binary alloy phase diagram [12]
Summary
Bimetal composites can utilize the advantages of two materials, obtaining a property that a single metal cannot satisfy. Miao et al [16] investigated the mechanical properties and microstructure of AZ31 and Q235 welded joints by laser penetration brazing They discovered that joining magnesium alloy to steel was defect-free when the laser offset was 0.6 mm and the tensile strength reached a maximum of 185 MPa. Wei et al [17] designed a stirring pin to obtain magnesium alloy and stainless steel welding joint made using friction stir lap welding. 2205 stainless steel was explosive welded to AZ31B magnesium alloy. Mechanical properties such as micro-hardness, tensile shear strength and tensile strength of explosively welded composite plate were evaluated.
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