共查询到18条相似文献,搜索用时 131 毫秒
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轻合金的半固态加工技术 总被引:4,自引:0,他引:4
轻合金的半固态加工指对具有球状晶的半固态合金进行成形,是一种新的加工技术。获得球状非枝晶的方法有机械搅拌、机械剪切、电磁搅拌、应变诱导熔化活化(SIMA)等方法。半固态加工工艺有半固态挤压、半固态轧制、半固态压铸、半固态锻造等。铝镁合金的半固态加工研究和应用进行得较多 相似文献
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半固态加工是一种综合传统铸造工艺和锻压工艺优点的近净成形技术,能有效地实现成形件控形与控性的统一。并且这种加工工艺能够实现短流程、低能耗和环保的要求,因此半固态加工工艺得到了迅速发展,在工业生产中实现了广泛的应用。近些年来,半固态加工技术在轻合金领域展开了大量的研究且成功应用于生产领域。高熔点合金由于其固液相温度较高,在进行半固态加工时仍然存在一些技术难点,因此高熔点合金的半固态加工研究相对较少。文章从高熔点合金半固态坯料(浆料)的制备,半固态成形工艺的研究和半固态成形模具的研究3个方面介绍了国内外高熔点合金半固态加工技术的研究进展。 相似文献
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半固态金属浆料制备工艺的研究进展 总被引:5,自引:1,他引:4
总结了传统的半固态浆料制备方法,同时还介绍了近几年出现的几种浆料制备新工艺和半固态加工技术在国内外的应用现状,并展望了半固态加工技术的发展前景及应对措施. 相似文献
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铝合金半固态加工技术的应用研究 总被引:2,自引:12,他引:2
重点介绍了近年来在铝合金半固态坯料制备方面的研究进展以及在半固态触变成形技术工业应用方面的研究开发工作,如复合电磁搅拌制备半固态浆料、多流电磁搅拌半固态连铸技术、铝合金半固态触变压铸成形、铝合金半固态触变模锻成形等,并就其可能的应用领域及发展状况如难铸造合金的铸造成形、变形合金的直接铸造成形、活塞合金的加工成形、变形铝合金的塑性加工进行了讨论。 相似文献
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基于半固态等温热处理工艺制备镁合金非枝晶组织坯料的研究进展 总被引:5,自引:0,他引:5
镁合金半固态铸造成形技术作为镁合金研究开发的重要内容之一,其开发成功的一个关键问题是半固态非枝晶组织坯料的制备。半固态等温热处理作为一种比较有发展前途的镁合金非枝晶组织坯料制备方法,对其展开研究将有助于丰富镁合金的半固态形成理论和加速该技术在镁合金上的工业化应用。在半固态等温热处理制备镁合金非枝晶组织坯料已取得研究成果的基础上,回顾了半固态等温热处理工艺对镁合金非枝晶组织形成的影响,分析了半固态等温热处理过程中镁合金非枝晶组织的形成机理,指出了该技术目前还存在的问题,并展望了今后的发展方向。 相似文献
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21世纪最具发展前景的近净成形技术——半固态加工 总被引:14,自引:6,他引:8
就半固态加工技术的制坯机制、半固态充填流变学、高压下结晶凝固和力学成形理论进行了讨论,在此基础上, 就目前流变成形和触变成形的工艺过程、特点以及应用前景作了分析,指出由于半固态加工与其他成形工艺相比具有许多 优势,是一种潜在的、正逐步为世人认识的最具发展前景的近净成形技术之一。 相似文献
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Effect of alloying elements on structure and mechanical properties of semi-solid processed cast iron
Nuchthana Poolthong 《International Journal of Cast Metals Research》2013,26(5):523-530
Semi-solid metal processing of alloys is one of the key technologies for producing advanced materials. Through semi-solid processing, it is possible to produce high quality cast components from grey cast iron. A series of experiments were carried out to clarify the effect of the alloying elements copper, chromium, molybdenum, and nickel on the properties of cast iron. A comparison was made of the microstructure and mechanical properties in semi-solid processed cast iron and ordinary cast iron. This showed that an increase in the level of alloying elements in cast iron gave a higher level of hardness. However, the tensile strength of alloyed semi-solid cast iron did not exceed that of grey iron, for every composition, as a result of the characteristic microstructure produced by semi-solid processing. Thus, the alloying elements had little effect on the tensile strength of semi-solid cast iron, but did have an effect on elongation. The tensile strength of semi-solid cast iron, however, still depends on the cooling rate. 相似文献
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Semi-solid slurry of A356 alloy was prepared by low superheat pouring and slightly electromagnetic stirring, and the fractal characteristics of morphology in semi-solid primary phase was researched. The fractal dimensions of primary phase morphology in the semi-solid A356 alloy were calculated by the program written to calculate the fractal dimensions of box-counting in the image of solid phase morphology in semi-solid metal slurry. The results indicated that the morphology of primary phase in semi-solid A356 prepared by low superheat pouring and slightly electromagnetic stirring is characterized by fractal dimension, and the primary phase morphology obtained by the different processing parameters has different fractal dimensions. The morphology of primary phase at the different position of ingot has different fractal dimensions, which reflected the effect of solidified conditions at different positions in the same ingot on the morphology of semi-solid primary phase. Solidification of semi-solid alloy is a course of change in fractal dimension. 相似文献
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Research and Applications of Semi-solid Processing 总被引:1,自引:0,他引:1
Since it was pioneered by Flemings and otherresearchers [11, the semi-solid metal processingtechnique has been widely stUdied in the world.Especially in the past decade, SSM as a newproduct forming technique has been rapidly developed and put into commercial applications[2, 31. In recent years, with the development ofthe ado-industry of China, a lot of researchwork on SSM has been done, including the preparation of slumes, reheating and thixoforming[Al6]; moreover, great achievements have … 相似文献