Abstract
A new hot forming process of a hot-rolled 2205 duplex stainless/AH36 low-carbon steel bimetal composite (2205/AH36 BC) was proposed in this study, using the Gleeble 3500 thermal-mechanical simulator and hot bending tools. The deformation characteristics of 2205/AH36 BC were studied by hot tensile tests at temperatures from 950 to 1250 °C and strain rates ranging from 0.01 to 1 s−1. The tensile temperature has a great influence on the peak flow stress of the bimetal composite. The main microstructure evolution mechanisms, including dynamic recovery (DRV) and dynamic recrystallization (DRX), changed with the deformation temperatures. The different strain rates and the change of strain rates during the deformation process have an influence on the flow behavior of the bimetal composite. During the hot bending process, qualified parts could be formed successfully without obvious cracks in the interfacial zone. Phase and grain orientation spread (GOS) maps of specimens after hot tensile and forming tests were obtained by the electron backscatter diffraction (EBSD) technique to study the microstructure evolution, respectively. It is found that the effect of the working temperature on microstructure evolution is larger than that of the stacking sequence for 2205/AH36 BC. The considerable geometrically necessary dislocation (GND) accumulation occurs around the interface of 2205/AH36 BC under all imposed working conditions after the hot bending process, due to the interfacial micro-defects and complex stress states.
Highlights
Demand for the multi-functionality and durability of engineering materials in worldwide industries has increased greatly due to the gradually stricter environmental regulations, and bimetal and laminated composites produced by two or more dissimilar constituent materials have become popular for applications in many fields, such as automobile, aerospace and chemical pressure vessels [1,2,3,4,5].The principal objective of developing bimetal composites is to combine the benefits of both constituent materials for applications where the full-gauge alloy construction is not required
In order to forward this aim, this study presented an investigation of a hot bending process for the 2205 duplex stainless/AH36 low-carbon steel bimetal composite (2205/AH36 BC) using a Gleeble 3500 thermal-mechanical test simulator
It is increase noted that the temperature a great impacttemperatures on the flow stress, decreasing with the inthe the working a great onon the stress, of decreasing with the increase in the imposed temperature temperature, has but has little impact influence theflow elongation the bimetal composite
Summary
Demand for the multi-functionality and durability of engineering materials in worldwide industries has increased greatly due to the gradually stricter environmental regulations, and bimetal and laminated composites produced by two or more dissimilar constituent materials have become popular for applications in many fields, such as automobile, aerospace and chemical pressure vessels [1,2,3,4,5]. The principal objective of developing bimetal composites is to combine the benefits of both constituent materials for applications where the full-gauge alloy construction is not required. The hard workability of medium-thickness bimetal composite plates is still a processing challenge to produce final parts with acceptable geometries and properties. In an attempt to respond to such a problem, the hot working processing of metals, including hot forming and forging [8,9,10], is suitable and cost-efficient to be employed, in which the weak and ductile metals are deformed instead of the strong state at lower temperatures
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