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灰铸铁件表层石墨的球化 总被引:1,自引:0,他引:1
在铸型表面涂刷特种合金涂料,浇注普通灰铸铁成分49铁水,可得到表层为球墨铸铁、其余主体为灰口铸铁冶金结合的球灰复合材料,表面球化层可达6mm以上。 相似文献
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准铸态工艺对贝氏体铸铁组织和性能的影响 总被引:10,自引:2,他引:8
试验研究了一定合金成分下,打箱温度、冷却介质、保温方式和保温时间等工艺因素对铸铁组织和性能影响规律。结果表明,在MnSiCuCr低合金化处理条件下,利用铸件浇注后的高温打箱、余热淬火及贝氏体转变温度下充分保温的准铸态工艺,可使球铁和灰铸铁基体组织稳定转变为奥贝组织为主的复相组织,并使铸铁力学性能大幅度提高。 相似文献
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采用泡沫陶瓷过滤净化铁液工艺 总被引:1,自引:1,他引:0
论述了铁液过滤净化的作用和意义,分析了几种常用的金属液过滤元件的特点和效果,介绍了新研制的低烧结型莫来石质泡沫的主要性能,并对泡沫陶瓷净化灰铸铁、球铁和合金铸铁进行了应用研究。结果表明:泡沫陶瓷过滤工艺的净化效果最优。低温烧结型莫来石质泡沫陶瓷不仅性价比高,而且能显著改善铁液纯净度,提高铸铁力学性能。 相似文献
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The high efficiency mechanized foundry technology of castings produced by using water-cooled copper alloy permanent mold has been systematically studied. Through the researching a Cu-Cr-Mg alloy with high conductivity and good combined mechanical properties used for making permanent mold was developed, and the basic design principles of the water-cooled permanent mold along with the control-range of relevant foundry processing parameters were also established.A cast production line equipped with water-cooled copper alloy mold was designed and fabricated for production of ductile iron automobile gear castings. This production line can consistently make automobile gear castings in QT500-15 and QT600-5 (Chinese Standard) grades of ductile iron with up to 95 % casting success rate. 相似文献
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采用中频感应电炉熔炼和合成铸铁工艺生产HT200和HT250牌号灰铸铁,并对其力学性能和金相组织进行了统计。与传统灰铸铁生产工艺相比,合成铸铁工艺不仅降低了生产成本,而且可以改善灰铸铁的力学性能。 相似文献
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C、Si、Mn、Cu对中锰球墨铸铁组织和性能的影响 总被引:1,自引:0,他引:1
应用湿砂铸型浇注中锰球墨铸铁,采用正交设计研究了C、Si、Mn、Cu对中锰球墨铸铁组织和力学性能的影响。结果表明,中锰球墨铸铁的铸态组织为奥氏体+碳化物+球状石墨,扫描照片中可见有大量细小均匀的韧窝。中碳、高硅、中锰和低铜有利于提高中锰球墨铸铁的硬度;低碳、高硅、中锰和中铜有利于提高其冲击韧度;低碳、中硅、低锰和低铜有利于提高其耐磨性。新开发的中锰球墨铸铁的硬度、冲击韧度和耐磨性远高于目前生产排沙潜水泵过流部件中所使用材料的各项性能,使用寿命是其2倍左右。 相似文献
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六十年来我国铸铁材料的发展 总被引:2,自引:1,他引:1
我国是铸造生产大国,2010年铸件年产量已近4 000万吨,连续11年位居世界首位.铸造新材料,新技术不断得到推广和应用,铸件质量逐渐提高,我国的铸造业正在向铸造强国挺进.本文简要论述了铸铁材料的发展历程、现状以及未来发展趋势.详细介绍了我国在灰铸铁、球墨铸铁、等温淬火球墨铸铁(ADI)、蠕墨铸铁、可锻铸铁以及特种性能铸铁方面的发展及应用情况,并指出了未来的发展方向. 相似文献
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Aravind Vadiraj G. Balachandran M. Kamaraj 《Journal of Materials Engineering and Performance》2010,19(7):976-983
A high-strength and wear-resistant alloyed gray iron with ausferritic microstructure on solidification directly from molten
condition could be made in a Ni and Mo alloyed gray cast iron. The as-cast ausferritic cast iron was compared with two conventionally
austempered gray iron with and without Ni and Mo additions. The various phase constitution and volume fractions were analyzed
using optical, SEM and XRD analyses. The various aspects of the alloy chemistry and processing conditions have been correlated
with the microstructure and mechanical properties obtained. The analysis showed that the Ni-Mo alloyed austempered gray iron
and the directly as-cast austempered gray iron had similar phase constitutions. The strength of the direct as-cast alloy with
ausferritic microstructure was higher than the others due to its higher austenite content and carbide distribution. The wear
rate of the conventionally austempered Ni and Mo containing alloy and direct as-cast ausferritic alloys is 20% of the austempered
gray iron without Ni and Mo with friction coefficient less than 0.4. 相似文献
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介绍钒在铸铁中的作用及含钒铸铁材料。其中包括钒在铸铁中的存在状态及分布规律,含钒铸铁的组织、性能及国内外含钒铸铁的应用情况,同时介绍了含钒贝氏体球铁的最新研究进展。 相似文献