【摘 要】
:
Casting technology of thin-wall TiAl alloy turbochargers was studied by investment casting and numerical simulation. Misruns and gas holes were the main defects
【机 构】
:
State Key Laboratory of Light Alloy Casting Technology for High-end Equipment, Shenyang 110022, Chin
论文部分内容阅读
Casting technology of thin-wall TiAl alloy turbochargers was studied by investment casting and numerical simulation. Misruns and gas holes were the main defects observed in preliminary work due to the poor fluidity of alloy, and to gas entrapment. In order to eliminate these defects, cast parameters, such as centrifugal rotation rate and mould preheating temperature, were optimized by numerical simulation, meanwhile, the structure of the shell mould was optimized to improve the filling capacity of TiAl alloy. Pouring experiments were carried out by vacuum induction melting face equipped with a water-cooled copper crucible based on the above optimization. The quality of the TiAl alloy casting was analyzed by fluorescent penetrant inspection and X-ray detection. The results show that a centrifugal rotation rate of 200 rpm, mould preheating temperature of 600 °C, shell preparation through organic fiber addition can dramatically improve the mould filling capacity, and integrated turbochargers were finally prepared.
其他文献
新冠病毒疫情对于我国社会政治、经济、文化和人民生活的影响巨大,目前,危机已从萌发、产生、发展逐步进入至消退阶段.通过梳理研究,结合疫情期间凸现的社会现象、社会心理的
复旦大学教授、博士生导师、复旦大学电光源研究所原所长、复旦大学光源与照明工程系原系主任陈大华教授,因病医治无效,于2020年1 月21 日逝世,享年77岁.
2019年5月16日,市场监管总局、工信部发布了《电器电子产品有害物质限制使用合格评定制度实施安排》,第一批管控目录于2019年11月1日起开始执行,国家相关部门对电器电子产品
依据IEC/TR 62778:2014《应用IEC 62471评估光源和灯具的蓝光危害》对LED PAR灯进行了蓝光危害检测评估,分析了LED PAR灯蓝光危害测量的影响因素,使用数学模型对测量不确定度
根据国家标准修订计划,国家标准《高压钠灯 性能要求》正在起草中.本标准技术内容对应于IEC 60662《高压钠灯 性能要求》(2011 年英文版第2版),与IEC 60662的一致性程度为非
介绍了一款车载调光大功率LED驱动电路,电路采用单片机MSP430F1232为核心控制器,集成调光控制模块LM3404,论述调光电路的硬件方案和软件方案的设计.电路可以实现对车载大功率
随着铸造行业的转型发展,3D打印技术已经成熟的应用于制造铸造砂型,所制作的砂型不再单单作为铸造过程中的半成品,而是可以作为产品面向各铸造厂进行销售。但是目前对于砂型的检验标准存在缺失,对于砂型质量的把控和评定缺少依据。针对铸造砂型的尺寸精度,通过设计制作测量试块,给出了一种3D喷墨打印砂型的测量方法及评定标准,填补了目前铸造行业中这一领域在标准上的空白,对推动3D打印技术在铸造行业的应用以及砂型的
The properties of gray cast iron (GCI) are affected by density of matrix, size of flake graphite and primary austenite. In this paper, the Y-type specimen of GC
The effect of Si addition on the microstructure and mechanical properties of Al-Mg-Si-Zn aluminum alloys were investigated. Results show that the microstructure