95 t氧气顶吹转炉倾动机构传动系统性能测试与分析

为了转炉的增容 ,对已建 95 t转炉主倾动设备进行现场性能测试 ,以便对转炉原设计性能进行验证和分析 ,为后续转炉设计提供可靠的参考数据 ,并为安全生产、合理使用设备 ,改进操作提供参考意见     

压铸高强韧Al-Cu系合金的组织性能及热处理

为了弥补目前压铸铝合金强韧性不足,进行了高强韧铝铜系合金的压铸及热处理的试探性研究.在ZL201的基础上,添加合金化元素B、Zr、V等,改善合金的铸造性能,进行压铸试验.试验研究发现压铸大大细化了合金的微观组织,铸态性能较金属型高,再经低温时效后合金强度达到一般高强压铸铝合金的水平,但塑性较之提高20%以上.     

Ir／Mo互扩散研究

研究了Ir/Re喷管制备过程中的Ir/Mo互扩散问题。在电子探针测量的基础上,根据扩散理论和Ir-Mo相图数据,建立并推导Ir/Mo扩散模型和解。计算得到Ir3Mo相中的互扩散系数为:D=9.0×10-9exp(-1.46eV/kT)(cm2/s),Ir基固溶体中的互扩散系数为:D=5.0×10-10exp(-1.1eV/kT)(cm2/s)。确定喷管中Ir/Mo互扩散的特点,给出估算Ir3Mo相层厚的方法。确定Re在Ir3Mo相中的扩散主要是受Ir控制。     

二次冷轧机组宽中浪板形缺陷控制研究

针对某DCR（Double Cold Reduction）二次冷轧机组经常出现宽中浪板形缺陷的问题，基于二次冷轧的生产工艺特点，通过分析计算，发现1#机架与2#机架承载辊缝比例凸度相差较大是宽中浪板形缺陷产生的主要原因，且鉴于该机组现有中间辊轴向横移和弯辊调控手段都不能有效消除该类板形缺陷，设计了1#机架中间辊辊型，该辊型在有效减少1#机架与2#机架承载辊缝比例凸度差异的同时，轧机的弯辊调控功效、中间辊轴向横移调控功效以及辊缝横向刚度都得到了有效提升。     

薄壁注射成型数值模拟技术的现状与发展

介绍了薄壁注射成型数值模拟技术产生的背景和科学意义，综述了薄壁注射成型数值模拟技术的研究与应用概况，探讨了薄壁注射成型数值模拟技术发展中所面临的一些关键问题，指出了薄壁注射成型数值模拟技术的研究发展方向。     

铸铁中石墨及石墨—基体界面近区力学行为

在SEM下原位观察铁素体基铸铁在拉伸时的形变和石墨-基体(G—M)界面断裂微观过程,结果表明,铸铁中石墨不应视为孔隙;石墨未造成缺口应力集中对石墨对铸铁强度的影响作出新的解释     

高能球磨及热挤压制备亚微米结构Al基复合材料

借助高能球磨Al及5%CuO合成了纳米复合粉末,进而在退火后,通过热压和热挤制备出了组织均匀、致密、晶粒尺寸约为120 nm～150 nm的亚微米块体Al基复合材料.XRD和显微组织分析表明:粉体球磨时,Al与CuO之间发生了还原反应,但生成物的热稳定性较差,在400℃退火过程中发生了与球磨时相逆的固态反应;复合粉末显微组织上的冷焊条纹其实质是球磨产生的高畸变区,退火使之逐渐消失;制备的亚微米块体复合材料主要以Al2Cu和Al2O3颗粒为增强相,室温下具有良好的压缩性能,但拉伸时表现出极大的脆性.     

原位自生钢基复合材料耐磨性能的研究

用铸造的方法制备了原位自生复合碳化物[(Ti,W,Cr,V,Nb)C]增强钢基复合材料,并对该复合材料的磨粒磨损性能及磨损机理进行了研究。结果表明,采用该方法制备的钢基自生复合材料中,自生碳化物颗粒细小、圆整、且分布均匀,碳化物颗粒增强相体积分数达到42.8%;原位自生钢基复合材料的耐磨性能优良。在磨粒磨损条件下,其磨损机制主要是显微切削、颗粒脱落和脆性剥落;稀土和合金元素能够提高原位自生钢基复合材料的耐磨性能。     

Effects of anodizing voltage on the anodized and hydrothermally treated titanium surface

Anodic oxidation is the process of creating a titanium oxide layer with various defects more dense and stable. In this study, a dense, stable and porous oxide layer was formed using anodic spark oxidation on pure titanium surface and hydroxyapatite crystals were formed on its surface via a hydrothermal treatment. A mixture of 0.02M−GP (Glycerolphosphate disodium salt) and 0.2M-CA (Calcium acetate) was used as an electrolyte. By increasing the anodizing voltage to 220, 260, 300, and 360 V, the effects of the anodizing voltage were examined by evaluating the film properties after anodization and a hydrothermal treatment. Breakdown occurred around 230 V. As the voltage increased after breakdown, the pore size increased. After the hydrothermal treatment, the amount of HA crystal precipitation was also increased as the voltage increased. The mean surface roughness (Ra) of the anodizing surface was also increased as the voltage increased. The Ra value was larger in the hydrothermally treated group compared with the group treated with anodization as a result of the HA crystals present on the surface after the hydrothermal treatment. Corrosion resistance of the surface modified by anodization was significantly increased in a saline solution compared to that for the non-treated group; this increased further after the hydrothermal treatment. These increases were most likely due to a thick stable oxide layer formed through anodization. Thus, it is believed that titanium with its surface modified through anodic spark oxidation would be a suitable biomaterial due to its corrosion resistance and biocompatibility.     

Al2O3/ZrO2快速凝固复合陶瓷显微结构与力学行为

通过在铝热剂中引入适量的ZrO2粉末,基于铝热氧化-还原反应、重力下陶瓷/金属液相分离,以大过冷条件下熔体共晶生长方式,制备出以ZrO2正方相纳微米纤维镶嵌于其上且长径比为8.0～12.0的蓝宝石棒晶及少量α- Al2O3片晶为基体的Al2O3/ZrO2自生复合陶瓷.通过材料力学性能测试与裂纹扩展路径观察,研究复合陶瓷显微结构与其力学行为之间的关系.结果表明,复合陶瓷的弯曲强度与断裂韧度分别达到1 256 MPa与13.2 MPa·m1/2;分布于蓝宝石棒晶上大量的面间距为纳微米尺度的Al2O3/ZrO2两相低能界面及残余压应力,使蓝宝石棒晶与陶瓷基体得以强化,迫使裂纹沿蓝宝石棒晶边界偏转;同时,因处于裂纹尖端尾部的蓝宝石棒晶桥接与拔出、α- Al2O3片晶桥接与摩擦互锁等效应,又使裂纹扩展呈现出强烈的稳定化倾向.