Effect of rolling reductions on microstructure and properties of 2Cr13/316L multi-layered steel composite plate by accum
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ARTICLE Effect of rolling reductions on microstructure and properties of 2Cr13/316L multi-layered steel composite plate by accumulative roll-bonding Rui Cao,a) Yun Ding, Xiaokang Zhao, and Xiaobo Zhang State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China
XiaoXia Jiang School of Mechanical Engineering, Ningxia University, Yinchuan 750021, China
YingJie Yan and Jianhong Chen State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, People’s Republic of China (Received 15 June 2018; accepted 14 September 2018)
The 2Cr13/316L multilayered composite plates were fabricated by hot rolling with recycle heating step. The effect of rolling reductions on microstructure and properties was investigated. The 2Cr13 layer consists of martensite and lath ferrite, but the middle layer has less ferrite than both sides. The content and grains of ferrite increase with the increase of the reduction and number of reheating, which leads to a decrease in the hardness of the 2Cr13 layer. The hardness of the 2Cr13 layer is determined by the volume ratio of martensite and ferrite. Tensile strength of the specimens with the rolling reduction of 72% and 82% reached 815.8 MPa and 763.4 MPa, while elongations were 20% and 20.8%, respectively. With the increase of the rolling reduction, the fracture mode also changed from cleavage fracture to dimple fracture. There were no cracks and delamination when the 2Cr13/316L composite plate bent to 130° and 180°, which indicated better interfacial bonding.
I. INTRODUCTION
With the development of industrial technology, it is difficult for single material to satisfy the increasing requirements of high strength and high toughness. For example, martensitic stainless steels with extremely high strength and hardness, but relatively less-ductile under an as-quenched condition have severe limits in its practical application,1 while the soft and ductile austenitic stainless steel just make up for this shortcoming. Recently, it was demonstrated that the rolling laminated composite plate combines its strength–ductility beyond these properties in conventional steels.2 At present, there are many methods for manufacturing composite plates, such as explosive welding method,3–5 electromagnetic casting method,6,7 and so on. The rolling method is one of the most common methods for producing metal composite plates. The existing studies are mainly concentrated on the rolling of the aluminum matrix composite plate,8–11 copper matrix composite plate,12–14 magnesium matrix composite plate,15–17 and titanium matrix composite plate.9,18,19 It has been reported that a)
Address all correspondence to this author. e-mail: [email protected] DOI: 10.1557/jmr.2018.373 J. Mater. Res., 2018
the roll bonding of metals is affected by various factors, such as rolling temp
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