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Numerical Simulation on Inclusion and Bubble Entrapment in Solidified Shell in Model Experiment and in Mold of Continuous Caster With DC Magnetic Field

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Journal of Iron and steel Research International 2012年第S2期19卷 853-857页

作者： Yuji Miki Hiroyuki Ohno Yasuo Kishimoto Kohei Furumai Shinya Tanaka steel Research Labs JFE Steel Corp jfe Systems corp

A model experiment investigating entrapment of inclusions and bubbles on the solidified shell was performed using molten steel,and the conditions for inclusion and bubble entrapment and mechanism of entrapment were studied. The results were applied to the flow behavior in the casting mold of a continuous *** the solid-liquid interface, entrapment of inclusions is greatly reduced by the existence of a low velocity flow,e.g.,0.05m/*** above-mentioned interfacial flow velocity dependency of inclusion entrapment is considered to be largely influenced by changes in the thickness of the concentration boundary layer,which depend on the interfacial flow ***,bubbles and inclusions which enter the concentration boundary layer are drawn to the solid-liquid interface by a suction force which is several orders larger than the Saffman's *** addition to the above-mentioned suction force,the so-called cleaning effect is determined by fluid-dynamic forces such as drag force,*** act on particles,and furthermore,by resident time of particles at the solid-liquid interface,which depends on the solidification *** a FC mold with a 2-stage electromagnetic brake,flotation of bubbles entrained in the jet flow from the nozzle is accelerated with the large DC magnetic *** is attributed to the braking effect of the DC field on the nozzle jet and the upward flow by the buoyancy of the *** a result,the interfacial flow velocity can be normalized by increasing the strength of the magnetic field,and entrapment of large bubbles and inclusions can be reduced.

关键词： continuous casting mold molten steel numerical simulation flow solidified shell surface defect inclusion bubble entrapment interfacial tension electromagnetic field

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Influence of Si,Ce,Sb and Sn on chunky graphite formation

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China Foundry 2011年第1期8卷 96-100页

作者： Hideo Nakae Masayuki Fukami Takayuki Kitazawa Ying Zou Lab. for Mater. Sci. and Tech. Waseda Univ. Tokyo Japan jfe steel corp. Japan Nippon steel corp. Japan Appl. Mech. and Eng. Waseda Univ. Tokyo Japan

The thirteen mother alloys,C%+1/3Si%=4.45%,differing in their Si,Ce,Sb and Sn contents,were *** grams of these alloys was remelted in a high purity alumina crucible at 1,450oC under an Ar atmosphere,and then cooled at 30 K/min for obtaining their cooling *** graphite morphologies were observed using an optical microscope and an *** three-dimensional graphite shapes were observed by the SEM using the samples whose matrices were etched off with an acid-aqua solution,to confirm the chunky *** discussing the influence of the Si and Ce contents on the chunky graphite formation,two experiments were carried *** the first one,the Si contents were changed from 0 to 4% in the 0.15%Ce alloys,and for the second one,the 3.5%Si and 4%Si samples that differed in the Ce contents of 0.1 and 0.2% were *** the third experiment,the influence of Sb and Sn on the chunky graphite formation was investigated by using the 4%Si and 0.1%Ce *** results showed that with the increase of the Si content,the volume fraction of the chunky graphite increases,while the volume fraction of the ledeburite decreases,and the chunky graphite volume fraction in the 0.2%Ce samples is higher than that of the 0.1%Ce *** effect of the Sb and Sn additions on the prevention of chunky graphite formation cannot be confirmed due to their high Si ***,further studies will be needed in this field.

关键词： chunky graphite spheroidal graphite graphite morphology solidification of cast iron

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Cu Precipitation and Hardening Behaviour in Cu Added 0.19%C-1.5% Mn Martensitic Ultra-High Strength steels

Cu Precipitation and Hardening Behaviour in Cu Added 0.19%C-...

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第二届先进钢铁结构材料国际会议

作者： Yasunobu Nagataki Toru Hoshi Kaoru Sato Yoshihiro Hosoya The Ferrous Nano-Metal Consortium JRCM JFE Steel Corp Kokan-cho Fukuyama Hiroshima-prf 721-8510 Japan

Cu precipitation and hardening behaviour of Cu added 0.19%C-1.5%Mn steels were investigated to elucidate the effectiveness of nano size Cu particle dispersion in tempered martensite matrix as the alloy design of ultra-high strength steels with superior formability. In this work, hardness measurement, TEM observation, lattice parameter measurement and tensile testing were conducted for the 0.19%C-1.5%Mn steels with addition of up to 4%Cu those were water-quenched followed by aging at 250 through 550 for 20 seconds through 360 *** added steels exhibited higher hardness than a Cu free steel in each aging condition and the hardenability was proportional to the Cu content. TEM observation revealed that the strengthening in Cu added steels was due to precipitation hardening by Cu particles. From the lattice parameter measurement, it is observed that Cu precipitation started at the aging time of 20 seconds and abruptly increased in the early stage of aging at 450℃. At the aging time of 60 minutes at maximum precipitation hardening, precipitated Cu content was estimated to be 2.5%. Smaller estimated activation energy for Cu precipitation than that of Cu diffusion in bcc-Fe matrix also suggested that high dislocation density introduced by martensitic transformation acted as the nucleation site or accelerated the diffusion of *** the tensile properties of the aged Cu free and 4%Cu steels, 4%Cu steel exhibited superior balance of tensile strength and elongation with tensile strength level of 1300MPa. This result indicates that dispersing nano Cu particles in tempered martensite matrix could give new design of ultra-high strength steels with superior formability.

关键词： Cu Addition Ultra-High Strength steel Precipitation Hardening

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富氧对改善烧结矿矿相结构的作用

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冶金信息导刊 2016年第4期53卷 24-31,60页

作者： Yuji IWAMI Tetsuya YAMAMOTO Takahide HIGUCHI Nobuyuki OYAMA Michitaka SATO Yasuhiro SODANI jfe公司钢铁研究实验室日本

在烧结厂评价喷吹气体燃料时富氧对改善烧结矿矿相结构的作用及其操作结果。矿物组成是影响烧结矿强度的一个重要因素，烧结矿的矿物组成包括Fe2O3、Fe3O4和铁酸钙等，而铁酸钙强度是所有矿相结构中最高的。用电炉进行的烧结试验结果表... 详细信息

在烧结厂评价喷吹气体燃料时富氧对改善烧结矿矿相结构的作用及其操作结果。矿物组成是影响烧结矿强度的一个重要因素，烧结矿的矿物组成包括Fe2O3、Fe3O4和铁酸钙等，而铁酸钙强度是所有矿相结构中最高的。用电炉进行的烧结试验结果表明，烧结矿中铁酸钙所占比例随大气中氧气浓度的升高而提高，而氧气浓度升高还会促使铁酸钙更加稳定。自2014年在jfe钢铁公司千叶厂烧结车间开始采用喷吹气体燃料和吹氧技术。在烧结厂进行喷吹气体燃料和吹氧试验，证实扩大温度区间1473～1673K，有利于烧结反应生成铁酸钙结构。富氧使焦粉和气体燃料的燃点转移到低温区，扩大适宜的温度区间，烧结矿中铁酸钙所占比例得到了提高。因此，证实在工厂烧结机上采用喷吹气体燃料和吹氧技术取得的效果与实验室试验结果相同。

关键词：烧结气体燃料富氧喷吹加热模式燃烧率

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X80级管线钢的生产和应用

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焊管 2005年第2期28卷 43-49页

作者：石川信行冈津光浩近藤丈 jfe钢铁公司钢铁研究所厚板研究所 jfe钢铁公司西日本制铁所钢铁研究所钢材商品技术部焊接室

介绍了日本jfe钢铁公司X80级和Xl00级管线钢中厚板(12.7～l6.9 mm)的合金设计原则,管线钢的焊接工艺设计和生产工艺流程,指出超冷却能力在线加速冷却工艺的优越性.系统分析了管线钢管的力学性能,冷展平取样方法因包申格效应形成的误差... 详细信息

介绍了日本jfe钢铁公司X80级和Xl00级管线钢中厚板(12.7～l6.9 mm)的合金设计原则,管线钢的焊接工艺设计和生产工艺流程,指出超冷却能力在线加速冷却工艺的优越性.系统分析了管线钢管的力学性能,冷展平取样方法因包申格效应形成的误差和钢管的现场环焊性能,并对jfe钢铁公司在X80级管线钢管方面的生产供货业绩做了介绍.

关键词：管线钢管加速冷却合金设计中厚板包申格效应环焊冷却能力钢铁公司 jfe 生产

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