B.Q. Li
材料科学技术（英）
Inherent twinnability of face-centered-cubic (fcc) metals was analyzed based on the direct competition between twinning partial dislocation nucleation and trailing partial dislocation nucleation, with which the twinnability of fcc metals can be simply expressed as function of the stacking-fault energy, the unstable stacking-fault energy, and the unstable twinning-fault energy of fcc metals. The predicted twinnability ranking matched well with former experimental results and provided a physical insight to understand twinnability from crystallographic orientation and fault energy parameters.
关键词:
Deformation twinning
Zhijian LIU
,
Zhiyou LI
,
Wei DUAN
,
Xuanhui QU
,
Baiyun HUANG
,
Siqi ZHANG
材料科学技术（英）
A LI-B alloy has been prepared using a pretreated amorphous B powder and pure Li ingot as starting materials by continually slow addition of B powder and intensified stirring in the process of melting. The microstructure and the discharge characteristic of the materials have been investigated. Results show that the problem of temperature control in synthesis would be modified by means of continual addition of B powder, the Li7B6 would be more finery distributed in the metal Li by means of intensified stirring. The discharge characteristic of the Li-B alloy using amorphous B as starting materials is almost the same with that of using crystalline B.
关键词:
夏金魁
,
李相付
,
曹龙琼
,
黄道昌
,
陈敏明
连铸
doi:10.13228/j.boyuan.issn1005-4006.20150143
在降本增效的背景下,炼钢厂生产Q235B连铸板坯时,进行了成分优化和工艺流程简化,按照新工艺生产后,Q235B连铸板坯出现较多内部裂纹.经数据统计、低倍检验和扫描电镜分析后表明,Q235B连铸板坯产生内部裂纹主要是由钢水脱氧不良、夹杂物含量高,拉速和二次冷却控制不合理等原因造成,通过深脱氧、延长氩站软吹氩时间及降低浇铸速度等措施,新工艺在w[Mn]/w[S]≤30条件下,Q235B连铸板坯内部裂纹发生率降至原工艺水平.
关键词:
脱氧
,
吹氩
,
拉速
,
二次冷却
韩秀丽
,
刘磊
,
刘丽娜
,
冯润明
,
刘胜昌
,
王重君
钢铁研究学报
保护渣渣膜的矿相结构是影响其传热与润滑性能的重要因素之一,偏光显微镜下对唐钢中厚板公司Q235B和Q345B板坯保护渣渣膜的矿相结构进行了系统研究.结果表明,Q235B板坯正常渣膜的结晶矿物主要为黄长石、枪晶石和硅灰石,结晶率高达90％～95％;Q345B板坯正常渣膜的结晶矿物中却没有硅灰石生成,并且结晶率也相对较低为35％～65％.对事故渣膜的研究发现,Q235B板坯出现纵裂对应的事故渣膜的突出特点是结晶率为65％～70％,较正常渣膜偏低;而Q345B板坯出现夹渣对应的事故渣膜与正常渣膜的最大区别是枪晶石晶体大量析出,并且结晶率异常升高至95％以上.
关键词:
Q235B和Q345B钢
,
连铸保护渣
,
渣膜
,
结晶矿相
,
结晶率
李明
,
李圣贤
,
王永民
,
校军立
中国冶金
针对Q420B热轧卷板使用性能要求,结合Q345B生产经验,详细描述了邯宝公司试制开发Q420B热轧卷板的冶炼、轧制工艺的设计,并对试制Q420B热轧卷板化学成分、力学性能、组织形态进行了详细分析.
关键词:
低合金结构钢
,
成分设计
,
工艺控制
许小静
,
段柏华
,
曲选辉
,
罗远辉
稀有金属材料与工程
通过对合成装置的温控、散热、搅拌桨叶片等进行有效改进,获得了300 g/炉的制备规模,制备出的合金性能均匀一致,其密度及抗拉强度分别为0.870 g/cm3,12.61 Mpa.同时,根据反应合成现象及XRD结果,分析了Li-B合金的反应机制及其动力学过程.
关键词:
热电池
,
Li-B合金
,
阳极材料
,
制备
,
反应机制
Fei Wu
材料科学技术（英）
A sol-gel processing was used to synthesize (Ca0.61,Nd0.26)TiO3 (CNT) nanoparticles doped with Li-Cu-B at low temperature. Orthorhombic perovskite structure phase with a small amount of Li3BO3 secondary phase was formed by calcining the xerogels at 300°C, and monodisperse CNT nano-powders with the grain size of 10−15 nm could be obtained. By using these nanocrystalline CNT powders, dense CNT ceramics could be achieved at the low sintering temperature of 1100°C due to the effect of the small size nanoparticles and liquid phase Li3BO3. And the dielectric properties with dielectric constant (εr= 89.52), quality value factors with frequency (Q£f=17148 GHz) and the temperature coefficient of resonant frequency (τf ) value of +239×10-6/°C were achieved.
关键词:
Sol-gel preparation
Fei Wu
材料科学技术（英）
A sol-gel processing was used to synthesize (Ca0.61,Nd0.26)TiO3 (CNT) nanoparticles doped with Li-Cu-B at low temperature. Orthorhombic perovskite structure phase with a small amount of Li3BO3 secondary phase was formed by calcining the xerogels at 300°C, and monodisperse CNT nano-powders with the grain size of 10−15 nm could be obtained. By using these nanocrystalline CNT powders, dense CNT ceramics could be achieved at the low sintering temperature of 1100°C due to the effect of the small size nanoparticles and liquid phase Li3BO3. And the dielectric properties with dielectric constant (εr= 89.52), quality value factors with frequency (Q£f=17148 GHz) and the temperature coefficient of resonant frequency (τf ) value of +239×10-6/°C were achieved.
关键词:
Sol-gel preparation
汪晛
,
秦祖宏
,
金海兵
,
黄道昌
钢铁研究
武钢集团鄂钢公司炼钢厂生产的Q345B钢交货前进行探伤检测,合格率仅40％.对Q345B探伤不合格钢板进行金相分析及夹杂物能谱分析,结果表明钛化物、氧化铝夹杂物、硫化锰、氢为造成探伤不合格的主要原因.对Q345B钢的生产工艺进行了系统的改进,采用转炉—板坯连铸—铸坯热送的转炉直上工艺生产的Q345B钢,探伤合格率可达到91％以上,实现了低成本工艺冶炼探伤交货的Q345B钢的目的.
关键词:
探伤不合格
,
Q345B钢
,
冶炼工艺
,
钛化物
,
氧化物夹杂
