Shengquan CAO
,
Youyuan LI
材料科学技术（英）
The mechanism responsible for the formation of recrystallization texture in cold-rolled Ti bearing interstitial free (IF) steel sheets was investigated using electron back-scatter diffraction (EBSD). In addition, the origin of nuclei with specific orientations was studied. The formation of recrystallization texture was explained by oriented nucleation. Most nuclei have a high misorientation angle of 25-55℃ with the surrounding deformed matrices, but no specific orientation of misorientation axis between the nucleus and the surrounding deformed matrix is observed. The stored energy of deformed grains is in the decreasing order of the {111}<112>, {111}<110>, {112}<110> and {001}<110> orientations. New {111}<110> grains are nucleated within deformed {111}<112> grains and new {111}<112> grains originate in the deformed {111}<110> grains.
关键词:
Oriented nucleation
,
nucleation
,
Stored
,
energy
,
Electr
Shengquan CAO
,
Jinxu ZHANG
,
Jiansheng WU
,
Jiaguang CHEN
材料科学技术（英）
In this paper, the orange peel defect in the surface range of the st14 steel sheet has been investigated using the electron backscattered diffraction (EBSD) technique. It has been found that the orange peel defect in the st14 steel sheet was resulted from the local coarse grains which were produced during hot-rolling due to the critical deformation in dual-phase zone. During deep drawing, the coarse grains with {100}<001> microtexture can slip on the {112}<111> slip system to form bulging and yields orange peel defects, while the coarse grains with {112}<110> orientation do not form the defect as the Schmid factor of {112}<111> slip system in it equals zero.
关键词:
Electron backscattered diffraction (EBSD)
,
null
,
null
,
null
邹元爔
,
赵彭年
,
曹兆民
金属学报
利用石灰的加碳还原反应,设计了一个新的研究方法,以直接测定液态高炉型渣中CaO的活度.这一方法的成功,依靠溶剂金属的正确选择以降低熔液中钙的化学位,而使金属钙量提高到可以用化学分析测定的水平.我们估计钙在锡稀溶液中的活度系数很小,可能符合于我们的要求,因此研究了下列反应:CaO+C(石墨)=Ca(锡)+CO(气).以测定液态CaO-SiO_2和CaO-Al_2O_3-SiO_2渣中CaO的活度,在上式中符号下波纹线表示溶于渣中的组分,直线表示溶子金属中的组分,下同.对于CaO-Si0_2系,应用Gibbs-Duhem关系从CaO活度值算出了SiO_2的活度值,并根据一个统计力学模型讨论了活度曲线的形状.从CaO-Al_2O_3-SiO_2系的研究结果,可知在所研究的整个碱度范围內,渣中存在10%Al_2O_3都使CaO的活度增加;当Al_2O_3为20%时,则对CaO活度的影响视碱度不同而异.对Al_2O_3的这种行为,根据炉渣的离子结构理论提出了解释.
关键词:
张子青
,
周继程
,
邹元燨
,
田彦文
金属学报
本文以Sn为溶剂金属,直接用“渣-金属”化学平衡法,在较大组成范围内测定了CaO-Si0_2-Al_2O_3三元熔渣中CaO的活度。成功地用图示推测法推测了较难直接获得实验结果的低CaO浓度范围内CaO的活度。应用本文实验结果和数据分析得到了该渣系中较全面的等CaO活度曲线图,并对Al_2O_3在该渣系中的酸碱性行为进行了探讨。
关键词:
刘彦海
,
段百泉
,
胡希东
耐火材料
doi:10.3969/j.issn.1001-1935.2007.04.012
为了降低真空冶炼用MgO坩埚因MgO的高温不稳定性对冶炼合金造成的影响,同时发挥CaO的脱硫作用,以w(MgO+CaO)>97%的MgO-CaO熟料为原料,在对MgO-CaO熟料进行水化试验和烧结试验研究的基础上,研制了MgO-CaO坩埚,并且与CaO坩埚一起对一种纯金属和同材质的高温合金进行了对比冶炼试验.结果表明:MgO-CaO熟料的抗水化性远高于石灰熟料的;在添加适当种类和数量的烧结助剂后,MgO-CaO熟料的可烧结性明显改善;MgO-CaO坩埚的冶炼效果达到甚至超过了CaO坩埚.
关键词:
真空冶炼
,
坩埚
,
CaO
,
MgO-CaO
游瑞云
,
肖荔人
,
刘欣萍
,
林葱里
,
黄宝铨
,
许兢
,
陈宇
,
陈庆华
材料工程
doi:10.3969/j.issn.1001-4381.2010.06.002
通过熔融共混法制备CaO含量不同的PE/CaO复合材料,借助熔体流动速率仪和AR2000旋转流变仪,对PE/CaO复合材料熔体的流变行为进行研究.结果表明:PE/CaO复合材料的黏流活化能随CaO含量的增加先上升后逐渐下降;当CaO含量(质量分数,下同)≤20%时,复合材料的线性黏弹性与纯PE相近,零剪切黏度变大的幅度较小;当CaO含量≥25%时,复合材料的时间稳定性下降,零剪切黏度明显增大.
关键词:
聚乙烯
,
氧化钙
,
复合材料
,
流变行为
吴文远
,
陈旭东
,
陈杰
,
孙树臣
,
涂赣峰
稀土
doi:10.3969/j.issn.1004-0277.2004.02.006
研究了630℃～870℃焙烧温度范围内,CaO、NaCl对独居石分解率影响的变化规律,得出了相应的回归方程,并且用该方程讨论了CaO、NaCl、焙烧温度对独居石分解率的影响.研究结果表明:独居石分解率随CaO、NaCl增加、焙烧温度的升高而增加.当CaO和NaCl加入量分别都为45%,焙烧温度为870℃时,独居石的分解率达到78.39%.
关键词:
CaO-NaCl
,
独居石
,
分解率
