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Rejuvenated metallic glass strips produced via twin-roll casting

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Journal of Materials Science & Technology 2020年第3期38卷 73-79页

作者： Long Zhang Yi Wu Shidong Feng Wen Li Hongwei Zhang Huameng Fu Hong Li Zhengwang Zhu Haifeng Zhang Shenyang National Laboratory for Materials Science Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China Shenyang Ligong University Shenyang 110159China Advanced Manufacturing Technology Research Centre Department of Industrial and Systems EngineeringThe Hong Kong Polytechnic University999077Hong KongChina State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China

The energy state and atomic level structure of metallic glasses(MGs)are very sensitive to their cooling rates,and a lower cooling rate generally causes a lower energy and more relaxed state of *** this work,the Zr41.2 Ti13.8 Cu12.5 Ni10 Be22.5(Vit.1)ribbons with a thickness of 40μm and 110μm and the strips with a thickness of 320μm and 490μm were produced by single-roll melt spinning and twin-roll casting,*** increase in thickness of either ribbons or strips results in a lower energy state with a smaller relaxation enthalpy,a lower content of free volume,and a higher *** the cooling rate of the twin-roll produced 320μm-thick strip is almost one magnitude lower than that of the single-roll produced 110μm-thick ribbon,the former,however,possesses a rejuvenated energy state as compared to the *** dynamics simulations reveal that the squeezing force during twin-roll casting affects the evolution of connection types of clusters,and the 2-atom and 4-atom connections are prone to be retained,which results in a higher energy state of *** a rejuvenation process during twin-roll casting can overwhelm the relaxation process caused by the lower cooling ***,twin-roll casting is not only a method being capable for producing strips with a large thickness,but also prone to obtain a high energy state of the MG strip.

关键词： Metallic glass Metallic glass strip twin-roll casting Rejuvenation Cluster connection

The future of the twin-roll strip casting and rolling process

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Baosteel Technical Research 2019年第3期13卷 1-7页

作者： FANG Yuan ZHANG Jian Research Institute Baoshan Iron & Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and rolling Shanghai 201999China

twin-roll strip casting and rolling is a typical near-net-shape steel manufacturing *** twin-roll strip casting and rolling of low-carbon steel strips has made a number of breakthroughs and achieved significant results during the past 20 *** has been paying close attention to the development of this technology and set up a research and development project focused on its industrialization in *** Ningbosteel-Baosteel strip casting industrialization demo project(NBS),which was launched in 2016,marks the strip-casting technology(registered as Baostrip) developed by Baosteel as having reached an advanced international level after 15 years of *** paper summarizes the results obtained in the industrialized demonstration plant and considers the future development of strip casting and rolling.

关键词： twin-roll strip casting and rolling industrialization commercialization

Design of a high-precision twin-roll strip caster

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Baosteel Technical Research 2019年第3期13卷 8-13页

作者： YE Changhong QIAO Jianji WANG Chengquan Research Institute Baoshan Iron & Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and rolling Shanghai 201999China Baosteel Engineering & Technology Group Co. Ltd.Shanghai 201999China

During strip casting,the thickness deviation of casting strip directly affects the quality of the hot-rolled sheet because the casting strip needs to be rolled only *** accurately control the gap between casting rolls and reduce the thickness deviation of the casting strip,a conceptual design of a prestressed twin-roll caster is proposed herein;this caster involves the setting of a constant pressure balancing cylinder between the chocks of two casting *** balancing cylinder hydraulic system adopts a three-way servo valve that controls the hydraulic *** parameters of the hydraulic power components are determined using the principle of optimal power matching,and the hydraulic system model of the balancing cylinder is thus *** dynamic analysis and simulation of the hydraulic system are performed using finite element model to obtain relevant evaluation ***,the hydraulic system is corrected using proportional-integral-derivative (PID) correction to achieve a well-controlled ***,the engineering requirements of the strip casting process can be met.

关键词： strip thickness deviation prestressed twin-roll caster balancing cylinder hydraulic system dynamic simulation

Wear analysis of a side dam in twin-roll strip casting

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Baosteel Technical Research 2019年第3期13卷 14-18页

作者： YE Changhong FANG Yuan ZHANG Yujun HAN Yuesheng Research Institute Baoshan Iron & Steel Co.Ltd.Shanghai 201999China Shanghai Engineering Research Center of Strip Casting and rolling Shanghai 201999China Baosteel Engineering & Technology Group Co. Ltd.Shanghai 201999China

Reducing wear on a side dam can prolong the casting operation life of a twin-roll strip casting process,thus reducing production cost and improving casting *** lengthen the service life of the side dam,it is necessary to understand the wear performance of the side dam *** investigate the wear behavior mechanism of the side dam,in this study,the UMT-2 friction and wear tester was used to determine the relationship between the wear rate of the side-dam material and various *** on the roughness of the contact area between the side dam and the end of the casting rolls as well as on the amount of deformation of the side dam,which was derived using a thermal-deformation simulation model,the reasons for the uneven wear of the side dam were obtained.

关键词： twin-roll strip casting side dam wear test thermal deformation roughness of the contact region