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液压系统设计与运行可靠性探讨 总被引:2,自引:0,他引:2
液压系统设计与运行可靠性探讨郑红星*随着液压传动技术应用范围的不断扩大,对液压系统运行的可靠性提出了越来越高的要求,特别是对于诸如冶金连铸、轧钢一类自动化程度高的流水作业线,一旦液压系统出现故障,不仅影响整条生产线的产品质量与产量,严重时还会造成重大... 相似文献
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For the first time, the undercooling of a magnetostrictive material-a near peritectic Tb0.27TDy0.73Fe1.90 alloy was realized by vacuum electromagnetic levitation melting and 60 K undercooling was obtained. There is one recaleseence be-havior during sol;difieation of the undercooled melt, which can attribute to the priority precipitation of REFe2 phase instead of REFe3 phase, due to preferential nucleation and higher crystal growth rate of REFe2 phase and the suppression of peri-tectic reaction. According to the crystal structural characteristic of REFe2 and REFe3, REFe2 is a Laves phase intermetal-lics with MgCu2 type structure, which has similar polytetrahedral structure wltn short range ordered structure in under-cooled melt and has lower potential barrier for nucleation than that of REFe3, which lead to the preferential nucleation of REFe2 phase directly from the undercooled melt. Also, the similarity of structures between REFe2 phase and undereooled melt leads to higher crystal growth rate of REFe2 phase than that of REFe3. 相似文献
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研究了热处理对Ni55.30Fe17.60Ga27.10磁致形状记忆合金组织和马氏体相变的影响.电弧态合金组织中马氏体板条模糊.在氩气保护,800℃保温4h缓慢冷却条件下热处理后,马氏体板条规整平直.DSC结果表明Ni55.30Fe17.60Ga27.10合金在加热/冷却时发生热弹性马氏体相变.热处理后Ms=43.24℃,Mf=36.72℃,As=46.84℃,Af=51.83℃.相比电弧态,热处理后合金Ms和Mf提高,As和Af降低,相变滞后减小.XRD结果证明热致马氏体为14M马氏体. 相似文献
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