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以工业高磁感取向硅钢的化学成分为基础,采用真空感应炉冶炼了两炉试验钢,其中-炉为基体钢未添加微合金元素作为对比钢,另-炉钢中添加了微合金元素Nb以形成新型抑制剂.采用石英管直接伸入钢水吸取少量钢水后迅速插入水中进行急冷.电子显微镜的分析结果表明,试样中的大型夹杂物为MnS与Al2O3,和/或Mgo的复合物.基体钢以及Nb微合金化试验钢急冷样品中都弥散分布着细小的析出物,这些细小析出物的直径约为几个纳米.Nb微合金化的高磁感取向硅钢中,不仅有Mns和AlN的细小析出物,还有大量细小的Nb(C,N)析出颗粒.采用Nb微合金化有望降低取向硅钢的板坯加热温度,还可能会进-步增强抑制剂的抑制效果. 相似文献
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通过热力学计算与模拟试验研究了含钒钛取向硅钢中氮化物析出相的析出规律与析出行为,并探讨了含钒钛元素的氮化物析出相作为薄板坯连铸连轧流程制备取向硅钢中辅助抑制剂的可行性.研究表明,在所冶炼的含钒钛取向硅钢的成分范围内,TiN在钢液凝固末期便具备析出的热力学条件,而AlN与VN只可能在凝固后的α+γ或α+Fe3C两相区内析出.含钒钛取向硅钢中氮化物析出相以成分复杂的复合析出相为主,且随着钒钛加入量的增加,钢中抑制剂析出相总的分布密度由于含钒钛元素的氮化物析出相的增加而明显提高,使抑制剂抑制初次再结晶晶粒正常长大的能力得以加强,最终成品的磁感应强度值B8由1.857 T提升至1.898 T.同时,加入不高于0.007%的Ti与不高于0.005%的V不会影响中间脱碳退火工序的脱碳效果以及高温退火净化阶段硫、氮的脱除效果,其形成的含钒钛元素的纳米级氮化物析出相适合作为薄板坯连铸连轧流程制备取向硅钢的辅助抑制剂. 相似文献
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以工业0.27 mm规格高磁感取向硅钢为研究对象,研究了酸溶铝(Als)含量对常化板析出物析出行为的影响.结果表明:常化板中的析岀物主要是AlN与MnS和AlN的复合析出物,随着Als含量的升高,析出物数量增加,但析出物平均尺寸变化不大.常化板中粗大的析出物大多是复合析出物,且多是以MnS为核心,AlN在MnS表面析出,而常化板中细小的析出物多为单一的析出物.常化冷却阶段,由于过饱和的Al和N在珠光体区域附近更多地析出,常化板珠光体区域附近存在较多细小的AlN粒子. 相似文献
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Argon oxygen decarburisation–electroslag remelting (AOD-ESR) process has been well used to produce the Fe–Mn–Si–Al twinning induced plasticity steel (TWIP) steels. The characteristics of AlN inclusions formed in TWIP steels after AOD refining, ESR and forging process were investigated by scanning electron microscopy and X-ray energy dispersive spectrometry. An automated program called ‘INCAFeature’ was used to collect statistics of inclusion characteristics. Great differences on the amount, distribution and morphologies of AlN inclusions were observed in AOD ingots, ESR ingots and forgings. The dominating inclusions in AOD ingots are mainly single Al(O)N and MnS(Se)–Al(O)N aggregate, accounting for 66.7% of the total inclusions. After the ESR process, AlN inclusions in all size range significantly decreased, which were rarely observed in ESR ingots. Thermodynamic calculations show that AlN inclusions can precipitate in the liquid Fe–Mn–Si–Al TWIP steels, which is different from the viewpoint of literatures that the precipitation of AlN inclusions took place at solidifying front or solid phase. Furthermore, the thermodynamic calculation result has been verified by high temperature laser scanning confocal microscope experiments. 相似文献
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采用连续退火和井式退火两种消应力退火工艺生产35SW440牌号的爱泼斯坦方圈样,并对不同消应力退火工艺与组织、析出及磁性能之间的关系进行了比较研究。结果表明:一次退火板经消应力退火后铁损明显降低,磁感增加。与井式退火工艺相比,连续退火工艺生产的铁心在高磁密条件下磁性能较差,主要原因是带钢表面出现了明显的表面渗氮现象。表面渗氮源于其保护气氛、退火工艺设计不合理,形成大量细小弥散的AlN析出物。AlN析出物通过影响磁畴壁和磁矩运动,恶化磁性能。井式退火工艺由于有效控制了带钢表面渗氮,显著降低了电工钢片高磁密下铁损值,使成品铁心性能指标得到改善。 相似文献
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M. H. Biglari Ph.D. Student C. M. Brakman E. J. Mittemeijer S. Van Der Zwaag 《Metallurgical and Materials Transactions A》1995,26(4):765-776
The kinetics of the precipitation of aluminum nitride on internal nitriding the Fe-2 at. pct Al alloy was investigated for
cold-rolled and recrystallized specimens exhibiting “ideally weak” interaction behavior of the solutes Al and N. The kinetic
analysis was performed using mass-increase data obtained for thin foils (thickness ⪯0.1 mm) upon nitriding in a NH3/H2 gas mixture at temperatures in the range 803 to 853 K. Activation-energy analysis revealed that precipitation of AlN in the
recrystallized specimens is associated with a Gibbs free energy barrier for the formation of a precipitate of critical size;
the precipitation rate is controlled by both nucleation and growth. On the other hand, precipitation of AlN in the cold-rolled
specimens occurs without a Gibbs free energy barrier for formation of a precipitate of critical size; the precipitation rate
is controlled by growth with kinetics governed by volume diffusion of alu-minum. Analysis of the total Gibbs free energy of
formation of AlN in the α-Fe matrix showed that in the case of the recrystallized specimens, the formation of incoherent AlN
precipitates with a hexagonal crystal structure is favored. In the case of the cold-rolled specimens, containing a high dislocation
density, the formation of coherent AlN precipitates with cubic crystal structure is favored, at least in the beginning of
precipitation. 相似文献
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Khoruzhaya Vera G. Martsenyuk Petr S. Meleshevich Konstantin A. Velikanova Tamara Ya. 《Powder Metallurgy and Metal Ceramics》2002,41(5-6):278-283
The reaction of components of the Si — Al — O — N — Ti system in its elements Si 3N4 — AlN, TiN — AlN, and Al 2O 3 — AlN was investigated by differential thermal and x-ray diffraction analysis. It was established that upon hot pressing mixtures of Si3N 4 and AlN (up to 1950°C) free silicon is formed by the decomposition of Si 3N4, which reacts with oxygen present as an impurity to form SiO. When TiN reacts with AlN a phase with the spinel structure (Al23O 27N 5), which can form only in the presence of excess oxygen, appears in addition to the initial components. Spinel is also produced by the reaction of Al 2O3 with AlN. In this case a eutectic between Al 23O27N5 and Al2O3 is observed. 相似文献
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对取向硅钢高温退火工艺进行实验室模拟,采用聚焦离子束显微镜(FIB)观察了氧化层中二氧化硅和氧化镁反应的微观形貌演变过程,采用能谱仪(EDS)分析了试样截面近表层Mg、Al、Si等元素的分布规律,最后采用透射电镜(TEM)分析了对成品试样硅酸镁底层的结构特征。结果表明:(1)Mg离子的扩散速度是影响硅酸镁底层反应的主要因素;(2)Mg离子最初沿着二氧化硅颗粒与铁基体之间的界面扩散,逐渐将二氧化硅颗粒包覆;随着温度的进一步升高,Mg离子开始向二氧化硅颗粒内部扩散,并与之反应;(3)随着温度的升高,特别是在AlN分解后,钢基中的Al会逐渐将钉扎部位的硅酸镁(Mg2SiO4)完全转化成为镁铝尖晶石(MgO·Al2O3)。 相似文献
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�ս��� ������ ����������ʥ�ң���Ԩ�� 《钢铁研究学报》2014,26(10):35-39
The precipitation behavior of MnS and AlN in low-temperature high magnetic induction grain-oriented silicon steel produced by thin slab casting and rolling process with ??acquired inhibitor method?? during continuous casting and soaking was studied by thermodynamic calculation. The calculated results show that AlN is likely to precipitate in ferrite after solidification. However, MnS can precipitate only in the two phase region of ferrite and austenite. Meanwhile, MnS and AlN in the steel can not be completely dissolved during the soaking stage. In addition, the abnormal growth of primary grain is not obvious after high-temperature nitriding, which indicates the number of inherent inhibitor in the steel is relatively sufficient before nitriding. 相似文献
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K. A. Bolgaru Lu. N. Chukhlomina Yu. M. Maksimov 《Russian Journal of Non-Ferrous Metals》2017,58(5):540-544
The results of an investigation into the mechanism of nitriding the ferrosilicoaluminum complex alloy under isothermal and nonisothermal conditions are presented. It is shown that the nitriding process of ferrosilicoaluminum is complex and multistage. It is established that, when nitriding the ferroalloy, the primary product is AlN; then Si3N4 is synthesized and Si3N4-based solid solutions are formed. The influence of the main parameters of self-propagating high-temperature synthesis on the velocity and degree of nitriding the ferrosilicoaluminum alloy is investigated. Critical parameters of the combustion process are revealed. 相似文献
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将金属Al、Al3Ti和TiC以AlTiC中间合金的形式以及ZrO2颗粒共同引入Al2O3基体材料中,热压制备了Al2O3/TiC/ZrO2/AlN复合材料.在此基础上,添加(体积分数)1%透辉石作为烧结助剂,以实现复合材料的液相烧结并促进其致密化程度.复合材料在烧结过程中有新相AlN生成;同时Al、TiC以及Al3Ti释放的Ti原子发生原子重组生成Al2Ti4C.对热压后材料的硬度、断裂韧度和抗弯强度进行了测试和分析;探讨了透辉石对材料致密化程度及力学性能的影响效果;研究了复合材料断面断裂方式的变化对其力学性能的影响;并对AlTiC中间合金的细化特性进行了分析. 相似文献