Deformation Behavior and Strengthening Mechanisms of Multilayer SUS304/Cr17 Steels with Laminate/Network Interface
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LAMINATED metal composites containing heterogeneous layers and bimetal interfaces have been paid increasing attention in many applications, such as aerospace, automobiles, nuclear, petrochemical, desalination, weapons and so on.[1,2] The above applications are attributed to the outstanding mechanical properties, corrosion resistance and light-ion irradiation resistance, etc.[3,4] Since ancient times, many weapons with multilayer structures have been fabricated by multiple folding and forging techniques, such as Adze blades, Damascus swords, Japanese swords, Merovingian blades and Chinese blades, having super-high sharpness and flexural toughness.[5] In recent years, the microstructure and mechanical properties of layered metallic composites prepared by rolling have become the focus of researchers B.X. LIU, Q. AN, Y.F. GE, F.X. YIN, B.Y. ZHANG, W.X. YU, P.G. JI, X. ZHANG, and C.X. CHEN are with the Tianjin Key Laboratory of Materials Laminating Fabrication and Interfacial Controlling Technology, School of Materials Science and Engineering, Research Institute for Energy Equipment Materials, Hebei University of Technology, Tianjin 300130, China. Contact e-mails: [email protected], [email protected] Manuscript submitted September 19, 2019.
METALLURGICAL AND MATERIALS TRANSACTIONS A
in this field.[6–8] Actually, the rolling method can be carried out in four main ways based on the deformation temperature: hot rolling, warm rolling, cold rolling and cryogenic rolling.[9] Herein, hot rolling[6] is carried out to improve the processing performance of casting metals beyond the recrystallization temperature; warm rolling[10,11] is used to fabricate high-performance metals with ultrafine grains and strong texture at the temperature range between the recovery temperature and recrystallization temperature; cold rolling[12] is beneficial to enhance the yield strength and control the dimensional accuracy of metals and alloys at the room temperature; cryogenic rolling [13] below room temperature is a rapid development deformation method to fabricate high-strength metal plates with low-temperature phase transition. Cold-roll bonding and hot-roll bonding are two effective ways to fabricate laminated metal composites and metal clad plates.[14] Herein, cold rolling is used to join two dissimilar metals with low room-temperature deformation resistance and hardness,[3] such as copper clad steel plate,[15] copper clad aluminum plate,[16] aluminum clad steel plate[17] and Mg-Li clad aluminum plate,[18] etc. The cold-rolling process mainly includes rough rolling, diffusion annealing and finishing rolling.[12] Rough rolling requires the initial rolling pass with a super-high reduction ratio of
about 60 to 70 pct; the purpose is to obtain strong mechanical occlusion between the two dissimilar metals. Meanwhile, a rough brush treatment is necessary to obtain high surface roughness and friction stress.[12,19] In this way, the mechanical occlusion effect gradually becomes obvious with the increase of contact points and areas,[15] such a
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