凝固技术国家重点实验室(英文)

正The State Key Laboratory of Solidification Processing is completed and accepted in 1995,based on the original State Key Discipline of Casting Major in the support unit-Northwestern Polytechnical University,and has been developed into a State Key Laboratory supported by state national level discipline-Materials Science and Engineering.There are 112 staffs in the Laboratory at present,within whom are:4 academicians,6 National Outstanding Youth Science Foundation winners,     

基于Q235B钢铸坯的动态轻压应用研究

为提高Q235B内部质量,建立铸坯凝固传热模型和动态轻压下模型,利用MSC.Marc有限元软件进行单元网格划分并进行离散求解。结果表明,在拉速由1.4 m/min依次升到1.6 m/min时,出铸机口的热收缩值依次减小0.12 mm和0.14 mm;压下区间随拉速增大而增大但总压下量变化不大;同一固相率fs下,压下效率随着压下量的增加而增加。经钢厂实践,动态轻压下参数优化后铸坯的顶锻合格率达到99.41%、低倍合格率为99.75%,有效改善了铸坯的质量。     

Effect of boron addition on the microstructure and stress-rupture properties of directionally solidified superalloys

This study is focused on the effect of boron addition, in the range of 0.0007wt% to 0.03wt%, on the microstructure and stress-rupture properties of a directionally solidified superalloy. With increasing boron content in the as-cast alloys, there is an increase in the fraction of the γ′/γ eutectic and block borides precipitate around the γ′/γ eutectic. At a high boron content of 0.03wt%, there is precipitation of lamellar borides. Upon heat treatment, fine block borides tend to precipitate at grain boundaries with increasing boron content. Overall, the rupture life of the directionally solidified superalloy is significantly improved with the addition of nominal content of boron. However, the rupture life decreases when the boron content exceeds 0.03wt%.     

基于计算机模拟的A356合金热裂纹的研究

采用具有良好铸造性能和力学性能的A356合金为研究对象,基于计算机模拟的方法,利用Pro CAST软件对铸件铸造过程中的热裂纹进行了预测,并与实际结果进行了对比分析。结果表明,Pro CAST软件的热裂纹预测结果与实际浇注铸件的热裂纹情况较好吻合;随着杆长度的增加,热裂纹敏感区的热裂纹敏感性逐渐增大。     

烧结铝合金的生产工艺

美国专利US7166254本专利介绍了一种烧结铝合金的生产工艺,用这种工艺生产的烧结铝合金强度高并且强度分散度小,伸长率、疲劳强度和耐磨性都有很大提高。本发明工艺包括先把快速凝固的Al-Si合金粉、铝粉、铜合金粉混合,压成预制件,再把预制件     

基于MAGMAsoft的连接支架铸铝件铸造工艺设计

采用solidwork三维造型软件,利用MAGMAsoft模拟软件,对连接支架铸铝件铸造生产过程进行CAE模拟.经过多次模拟,选择了最适合的浇注系统和冒口设计,以及冷铁加载方位,可以有效地改善热节状态,达到消除和控制缺陷的目的,使铸件能够达到质量要求.     

凝固浴对PAN原丝性能的影响

在生产聚丙烯腈(PAN)炭纤维过程中,纺丝期间凝固浴的各种条件对纤维的成型和性能起着关键作用。本文介绍PAN高聚物在湿法一步法纺丝过程中二甲基亚砜(DMSO)凝固浴各种成型工艺条件对PAN原丝的结构、机械和物理性能的影响。     

基于华铸CAE的定子铸造工艺优化设计

采用华铸CAE软件对铝合金定子铸件的砂型铸造过程进行数值模拟,通过对铸造工艺方案的数值模拟和实验,优选出了最佳的铸造工艺用于生产,成功地消除了定子铸件生产过程的缩孔缩松缺陷.模拟结果与实际生产中的情况吻合较好.结果表明CAE技术能为工艺方案的评价和改进提供科学的依据,能缩短新产品的开发周期,为企业带来了显著的经济效益.     

碱性喷射混凝土促凝剂对水泥凝固的影响

碱性喷射促凝剂能使水泥浆的凝固时间大大减少.DCA(差示量热分析)结果显示,加入C3A和C3S都会使反应发生变化.ESEM(环境扫描电镜)照片也证明了,铝酸钙水合物的形成是水泥浆快速凝固的主要原因.