钢锭零能少氧化均热轧制的研究

根据计算机的辅助分析,采用新的钢锭传搁、注后强制水冷却、垫铁脱模等工艺后,入炉钢锭的热焓已超过开坯轧制需要,利用普通均热炉代替钢锭保温车,可完全依靠到钢锭自身潜热与显热进行均热。对不同锭型与钢种采用经试验的最佳时间均热后再轧制,收与保温车均热钢锭直接轧制相同的效果。     

应用10mm薄板铸锭制备的NdFeB烧结磁体

NdFeB薄板铸锭具有晶粒细，富钕相分布均匀及在稀土含量较低时可以防止α－Fe相出现的特点，是一种适合制备高性能烧磁体的合金铸锭，本文介绍了一种用10mm薄板铸锭和球磨制粉方法制备烧结磁体的工艺，在设备要求较低的情况下制备得到了Br=1.37T,(BH)max=320kJ/m^3(40MGOe)的烧结磁体，同时比较了使用常规铸锭和常规工艺的结果，强调了氢爆法在该工艺中的重要作用，最后对该工艺的改进方向和10mm铸锭的应用前景进行了阐述。     

Development of ultra light magnesium-lithium alloys

Magnesium-lithium alloys are among the lowest density metallic materials. Addition of lithium, with a relative density of 0·53, in magnesium reduces the density of the alloy significantly. Furthermore, addition of nearly 11 wt.% lithium converts hexagonal close packed structure of pure magnesium to a body centered cubic lattice, markedly improving formability of the alloy. The development of these alloys, however, had been hampered due to the high reactivity of lithium and magnesium in the molten state and also, due to poor creep resistance and instability of mechanical properties at room temperature. In an attempt to indigenize these ultra light alloys for possible applications in Indian satellite programme, detailed research work was initiated in DMRL. The difficulties associated with producing sound cast ingots have been overcome by controlling melting and casting parameters of these alloys. Extensive work has been done on structure-property correlation of alloys with varying lithium content and minor alloying additions. Based on these work, advanced magnesium-lithium alloys have been developed with improved tensile properties, room temperature stability and creep resistance. Wrought products (plates/sheets) of magnesium-lithium alloy have been supplied to ISAC, Bangalore and are being used in their INSAT-2 programme. This paper describes the systematic studies carried out in the laboratory to indigenize these ultra light alloys.     

3t电渣钢9Cr2Mo工艺实践

为进一步提高冷轧辊电渣锭的内(外)质量、降低生产成本的要求,贵阳特钢采用400mm×300mm矩形连铸坯取代(φ)330mm铸锭做为电渣母材,在计算机全过程自动控制下,实现1支自耗电极重熔1支3吨电渣锭9Cr2Mo.电渣冶炼的填充比由初期的0.347提高到0.487,电渣锭成锭率由91.17%提高到96.87%,电渣重熔电耗由1762kWh/t下将到1477 kWh/t.     

自润滑料垫的设计及其在立推式铝锭加热炉上的应用

本文详细论述了我公司自主开发的自润滑料垫的结构设计和技术特点，分析了这种料垫的优缺点，对其应用前景进行了展望。     

实现铝锭堆垛、称量、打包一体化控制系统

国内大多数铝锭生产企业在铝锭打包过程中。均采用人工作业方式。为此，根据铝锭生产工艺和技术要求以及现代科学生产管理理念。探讨铝锭称量、堆垛、打包一体化控制系统的研究，其主导思想是在原有的铝锭堆垛机控制系统上，实现铝锭自动化流水作业的功能，改变原有的铝锭生产作业方式。     

The laws of silicon ingot formation by combustion reaction

The formation of a phase pure silicon ingot from SiO₂+Al+KClO₃ and Na₂SiO₃+Al+KClO₃ systems was investigated thermodynamically and experimentally under combustion mode, known also as self-propagating high-temperature synthesis (SHS). The regularities of combustion and phase formation versus KClO₃ concentration by a thermocouple technique were obtained. The morphology, chemical and phase composition of the silicon ingot were analyzed by powder X-ray diffraction (XRD), scanning electron microscopy (SEM), and ICP-analysis. The method reported here proved effective in producing silicon ingots with a purity of 98%.     

NdFeB铸块HD工艺中温度和压力对吸氢行为的影响

对NdFeB铸块在HD工艺中温度和压力对吸氢行为的影响进行了研究。研究发现，NdFeB铸块在氢爆过程中明显存在孕育期，其吸氢过程分为四个阶段：孕育期阶段、慢速吸氢阶段、快速吸氢阶段和缓慢吸氢阶段；随着氢气压力(1～4atm)的升高，孕育时间缩短，吸氢越快；随着温度的升高，NdFeB铸块吸氢越迅速，当温度升至一定程度时，孕育期消失。扫描电镜观察发现，NdFeB合金氢爆破碎中的断裂方式包括沿晶和穿晶断裂，氢爆粉末尺寸小于50μm，取得了较好的氢爆效果。     

大尺寸高铌钛铝合金铸锭的组织

通过金相、扫描电镜、投射电镜、X-射线和能谱等方法对真空自耗 真空自耗凝壳复合熔炼工艺制备的Ti-45%Al-(8～9)%Nb-(W,B,Y)(原子分数)合金大尺寸铸锭的组织进行了分析。结果表明,铸锭组织是由表面细小均匀和大部分存在微观偏析的γ/α2片层团和少量分布于片层团间的γ和β(B2)晶粒组成的近层片组织(NL)。大部分组织含有明显的γ聚集区,片层团的尺寸为75μm,平均片层厚度为700nm。β以不规则形状存在于片层团间或以片状和块状存在于片层团内。另外有大量长达60μm的棒状和针状硼化物。     

双锭电磁铸造实验研究

通过对双锭电磁铸造模拟实验，研究了感应线圈内磁场分布，以及感应线圈以结方式、铸锭间距、电源频率和电流的变化时磁场分布的影响，为指导铸造工艺提供参考。