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结构材料喷射成形技术与雾化沉积高温合金 总被引:3,自引:0,他引:3
喷射成形是利用快速凝固方法直接制备金属材料坯料或半成品的先进材料制造技术 ,喷射沉积高温结构材料的冶金性能好、生产效率高、成本低 ,因而在近几年得到了迅速发展 .本项研究的主要目的是要通过喷射成形工艺参数的调整、最大限度地直接减少喷射成形坯中的孔隙度 ,进而得到优质坯料 .利用优化的雾化喷射沉积技术制备了多种高温合金沉积坯 ,沉积坯整体致密、晶粒细小、组织均匀、无宏观偏析、含气量低、力学性能提高 .还简要地比较了喷射成形高温合金与用常规铸锭冶金工艺和粉末冶金工艺制备高温合金的异同 ;总结了航空材料研究院喷射成形高温材料近年来的研究状况 ,包括专用高温材料喷射成形装置和技术及其应用 . 相似文献
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镍基高温合金具有强度高、抗氧化能力好、蠕变强度和持久强度好以及抗燃气腐蚀能力的特点,被广泛应用于航空航天、汽车通讯、船舶制造等领域.近年来,增材制造技术的进步加速了增材制造镍基高温合金的发展.激光增材制造对于镍基高温合金的制备具有独特的优势,如生产周期短、成本低以及可进行功能预设等.对于航空发动机及燃气机轮中喷嘴、燃烧室等热段部件以及航天飞行器等复杂零件的成形制造非常有利.目前,相关方面的研究热点主要有激光增材制造过程中凝固组织的变化规律、工艺参数与熔池宏观形态间的关系、残余应力的分析以及缺陷的探究.本文综述了增材制造技术制备镍基高温合金的研究进展,简要概括了增材制造技术和镍基高温合金的发展概况,总结了用增材制造技术制备的镍基高温合金成形件的显微组织、后处理后组织的变化及其对力学性能的影响,最后阐述了增材制造镍基高温合金成形件存在的缺陷及解决方法. 相似文献
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镍基高温合金在高温高压条件下具有较高的强度和良好的抗氧化、抗燃气腐蚀能力,广泛地用来制造航空喷气发动机、各种工业燃气轮机最热端部件。首先介绍了用选区激光熔化成形技术(SLM)3D打印镍基高温合金零件及其数值模拟的国内外研究现状,然后介绍了SLM技术成形的镍基高温合金的力学性能和微观组织结构以及后处理对其微观组织及性能的影响。其次介绍了通过有限元对增材制造过程的模拟,以及其对工艺过程指导意义。最后进一步介绍了SLM成形镍基高温合金领域的研究热点以及数值模拟在这一领域的应用。 相似文献
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采用真空感应熔炼的方法制备GH22母合金,然后真空感应重熔浇注成等轴晶成形试棒,测试其室温拉伸、高温拉伸和持久性能.利用熔模失蜡精密铸造技术生产了重型燃机GH22隔热板铸件,对隔热板不同部位进行了宏观晶粒度、光学金相、扫描电镜及能谱分析.从国产、进口隔热板底板分别取样加工成力学性能试样,进行了室温拉伸、高温拉伸和高温持久性能测试.结果表明:国产GH22母合金的成分和性能满足要求.国产铸件取样试样的宏观晶粒度、室温拉伸、高温拉伸性能与国外铸件相当.国产铸件具有更高的高温持久强度,这主要是由于国产GH22母合金中碳含量更高,合金组织中在枝晶间和晶界处析出更多的碳化物相. 相似文献
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喷射成形高温合金的研究进展 总被引:1,自引:0,他引:1
喷射成形高温合金具有成分均匀,无宏观偏析,氧含量低,晶粒细小等特征,同时具有较好的综合性能,是喷射成形研究的重要方向和活跃的前沿。简要介绍了喷射成形的基本原理,并对国家外喷射成形高温合金的研究进展情况进行综合评述。 相似文献
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《Materials Science & Technology》2013,29(10):1213-1218
AbstractThe development of new wrought magnesium alloys for automotive industry has increased in recent years owing to their high potential as structural materials for low density and high strength/weight ratio demands. However, the poor mechanical properties and low corrosion resistance of the magnesium alloys have led to searching a new kind of magnesium alloys for better strength, ductility and high corrosion resistance. The main objective of the present research is to investigate the mechanical properties and the corrosion behaviour of new magnesium alloys, Mg–Zn–Ag (ZQ) and Mg–Zn–Si–Ca (ZS) alloys. The ZQ6X and ZS6X–YCa alloys were prepared by using hot extrusion method. Hardness AC and DC polarisation tests were carried out on the extruded rods, which contain different amounts of silver or silicon and calcium. The potential difference in air between different phases and the matrix was examined using scanning Kelvin probe force microscopy. The microstructure was examined using optical and electron microscopy (TEM and SEM), X-ray analysis and EDS. The results showed that the silver addition improved the mechanical properties but decreased the corrosion resistance. The addition of silicon and calcium also affected both mechanical properties and corrosion behaviour. These results can be explained by the effects of alloying elements on microstructure of Mg–Zn alloys such as grain size and precipitates caused by the change in precipitation and recrystallisation behaviour. 相似文献
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A Soviet nickel base cast superalloy, ZHS6-K, has been examined for its response to B/C modification. Three alloy chemistry variants, with 0.17C/0.02B, 0.06C/0.1 B and 0.03C/0.2B (wt%) have been investment cast and investigated for microstructure, heat-treatment, tensile properties, stress-rupture properties and hot corrosion resistance. The B/C modification of the alloy results in some improvement in the yield strength. However, the tensile ductility and the stress-rupture properties are considerably degraded. The nature of the hot corrosion is of a pitting type for the ZHS6-K, whereas it is of a broad front type for the high boron alloys. 相似文献
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Salt-induced high temperature corrosion of superalloys has been studied with a burner rig. Results of investigations into the effects of alloying. composotion on hot corrosion behaviour of nickel-base superalloys, the effects of testing condtions on hot corrosion behaviour of a high-tungsten alumina-forming nickel-base superalloy and hot corrosion of a CoCrAlY-coated superalloy are reported. 相似文献
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NiAl基金属间化合物研究现状与前景 总被引:2,自引:0,他引:2
介绍了NiAl基金间化合物研究的现状与前景。NiAl由于具有高熔点、低密度和良好的抗氧化性等性能而被认为是下一代的高温结构材料,然而NiAl在室温时塑性低和高温时强度低限制了它作为工程材料的应用。对NiAl的晶体结构和缺陷、力学性能进行研究,采用合金化、控制显微结构和改进加工技术等方法使NiAl的室温塑性和高温强度都得到了提高。 相似文献
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《Materials Science & Technology》2013,29(11):1082-1092
AbstractThe relationships between titanium alloy microstructures and mechanical properties are reviewed. The influence of hot working on microstructure development is discussed, and developments in high temperature processing, including superplastic forming and isothermalforging, and the use of hydrogen as a temporary alloying addition are considered. Recent work aimed at modelling the high temperature deformation and microstructure development is also examined.MST/1265 相似文献
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