Effect of Annealing Temperature and Time on Microstructure and Mechanical Properties of Multilayered Steel Composite She
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NTRODUCTION
MULTILAYERED metal composites consisting of alternating metals or alloys exhibit superior physical and mechanical properties such as fracture toughness, fatigue behavior, impact behavior, wear, corrosion, and even deformability.[1] The mechanical behavior of multilayered metal composites has been extensively studied. Such composites suffer from limited bond strength of interfaces between dissimilar metals, sensitivity to cracking fracture in brittle layers, and a tendency toward interfacial delamination; if these shortcomings could be overcome, the properties of the composites would be greatly improved. Significant improvements in fracture properties, such as bending toughness,[2] fracture toughness,[1,3] impact resistance,[2–5] and fatigue properties,[1] have been reported. R. CAO, Professor, is with Lanzhou University of Technology, Lanzhou, 730050, China, and also with the Oak Ridge National Laboratory, Oak Ridge, TN 37830. X. YU, Staff, and Z. FENG, Group Leader, are with the Oak Ridge National Laboratory. Contact e-mail: [email protected] M. OJIMA and J. INOUE, Associate Professors, and T. KOSEKI, Professor, are with the Department of Materials Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan http://energy.gov/downloads/doe-publicaccess-plan. Manuscript submitted November 2, 2015. Article published online October 11, 2016 6042—VOLUME 47A, DECEMBER 2016
Raghavendra et al.[3] showed that the superior fracture properties of a Ti-Al3Ti metal-intermetallic laminate composite could be attributed primarily to the presence of uncracked ductile Ti layers that bridge crack wakes and shield crack tips from far-field loading. Carren˜o et al.[4] studied a seven-layer steel-based (mild steel and ultrahigh carbon steel (UHCS)) laminated composite processed by roll bonding. Their results showed that impact properties were improved in comparison with those of UHCS. Delamination plays an important role in deflecting cracks, absorbing energy, and initiating the nucleation of new cracks in the next material layer. Nambu et al.[5] demonstrated that tensile ductility could be markedly enhanced as the bonding strength increased. Recently, multilayered steels (MLSs) consisting of alternating layers of ultra-high-strength martensitic steel and ductile austenitic steel have shown the potential to achieve a combination of ultrahigh strength and good ductility, which is beyond the capabilities of t
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