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铝—钢双金属复合铸件研制 总被引:3,自引:0,他引:3
用钢套铸接表面预电镀纯金属、浸Al-Si基合金后立即浇注的方法制造了“钢套内表面浇注铝金”结构形式铝钢双金属铸件,优化了双金属铸件铸造工艺、热处理工艺;研究了钢套铸接表面金属预镀层和双金属界面附近的合金元素对双金属铸件铸态及热处理后界面过渡层裂纹和抗剪强度的影响。获得的双金属铸件铸态界面过渡层厚度为0.007-0.018mtn,界面剪切强度为50-94MPa,热处理后面过渡层增厚,界面剪切强度明显 相似文献
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《特种铸造及有色合金》2015,(5)
采用未浸表面改性剂直接热浸铝、浸表面改性+热浸铝两种不同的表面处理工艺分别对钢基体外表面进行处理,利用镶铸法制备钢-铝双金属复合材料,研究了复合铸件铸态和T6态的界面组织和结合性能。结果表明,直接浸铝铸件在Fe-Al交界处存在缝隙,未形成冶金结合层,其界面结合情况较未处理铸件有所改善,界面结合力提高了21.23%,达到60.30kN,缝隙率降至10.99%;改性+浸铝铸件存在Fe-Al、Al-Al两种界面,在Fe-Al界面处出现"锯齿状"冶金过渡层,界面剪切强度较直接浸铝铸件提高13.85%以上,缝隙率降至2.93%。改性+浸铝铸件T6热处理后,过渡层厚度明显增加,"锯齿"平均长度由31μm增至46μm,且过渡层成分逐渐均匀化,界面结合力增至79.71kN。 相似文献
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研究了不锈钢套表面预镀银、铜及浸铝工艺对1Cr18Ni9Ti-ZL101A双金属复合铸件铸接质量的影响。结果表明,镶铸用钢套表面镀银及合理控制浸铝工艺能得到性能优良的双金属复合铸件,复合扩散层厚度为0.008 ̄0.015mm,界面剪切强度达68.6 ̄84.3MPa。 相似文献
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研究了不锈钢套表面预镀银、铜及浸铝工艺对1Cr18Ni9Ti—ZL101A双金属复合铸件铸接质量的影响。结果表明,镶铸用钢套表面镀银及合理控制浸铝工艺能得到性能优良的双金属复合铸件,复合扩散层厚度为0.008~0.015mm,界面剪切强度达68.6~84.3MPa。 相似文献
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不锈钢/Al固液轧制复合板材界面剪切强度与界面结构 总被引:12,自引:0,他引:12
测定了不锈钢/Al固液轧制复合板材界面剪切强度。应用扫描电镜、X射线衍射仪对不锈钢/Al固液轧制复合板材界面和剪切断面的形态、结构、成分等进行了观察和分析。界面层由明显不同的二层组成,即接近钢的明显过渡层和接近Al的沿晶界富Fe相的析出层。界面结合牢固,强度高。剪切断面大多发生在Al处,否则发生在界面层和钢/Al原始界面处。钢板经助焊剂浸镀后,界面结合强度高于未浸镀的。X射线衍射确定界面层中的金属 相似文献
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利用室温4道次ECAP挤压结合退火工艺成功制备铜铝双金属复合棒材。采用扫描电镜(SEM)、能谱分析(EDS)、X射线衍射分析(XRD)和电子背散射衍射(EBSD)等方法研究铜铝双金属复合棒材结合界面微观组织,并通过剪切试验测试其界面结合强度。结果表明,在ECAP剧烈剪切作用下,铜铝双金属复合棒材首先通过塑性变形在界面处产生机械结合,后续退火热处理促进了铜铝原子之间相互扩散,在压力、温度和浓度梯度综合作用下,Cu/Al界面处形成了良好的冶金结合,界面层厚度约为1.47 μm,生成的金属间化合物主要为CuAl2;界面层内晶粒细小、均匀,为大角度晶界结构的超细晶组织,无明显的择优取向。铜铝双金属复合棒材平均剪切强度为28.94 MPa,界面结合质量良好,剪切破坏形式主要为脆性断裂。 相似文献
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铜/铝复合材料的固-液复合法制备及其界面结合机理 总被引:2,自引:0,他引:2
采用固-液复合法制备了铜/铝双金属复合材料,并对铜,铝复合界面的组织结构和结合性能进行了研究。在分析工艺参数对铜/铝复合界面影响规律的基础上,对复合工艺进行了优化。结果表明,在使用混合熔剂对铜板进行预处理的情况下,当铜板预热温度为400℃、铝液浇注温度为700℃时,可以获得铜/铝界面过渡层厚度为45μm、界面剪切强度达57MPa的良好复合界面。进一步研究表明,铜,铝复合界面的结合是通过铜/铝接触面上铜的熔化和向铝中的扩散实现的。 相似文献
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钢—半固态铝熔体压力复合板的界面力学性能与结构 总被引:6,自引:0,他引:6
采用压力复合方法实现了钢半固态铝熔体复合, 对复合板的界面剪切力学性能和界面结构进行了研究, 确定了半固态铝熔体固相率与复合板界面剪切强度之间的关系以及钢半固态铝熔体复合板的界面结构。结果表明: 铝熔体固相率为32 .2 % 时, 复合板界面剪切强度最大, 为69 .7 MPa , 其界面是由铁铝化合物和铁铝固溶体交替构成的新型结构。 相似文献
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《中国铸造》2016,(6):396-401
A low carbon steel (LCS)/high chromium white cast iron (HCCI) bimetal wear plate about 20 mm in thickness was prepared by liquid-liquid bimetal composite casting technology to substitute for the welding wear plate. A clear and distinguishable composite layer between the LCS and the HCCI was detected with SEM, and the composition and phase were analyzed through EDS and XRD. The composite layer was composed of three sublayers from the LCS to the HCCI: pearlite transition layer, composite layer, and HCCI transition layer. The Vickers hardness from the pearlite transition layer to the HCCI transition layer was 360 HV to 855 HV. The austenite grows as dendrites between the composite layer and the HCCI transition layer under constitutional undercooling. A large amount of C and Cr, and a smal amount of Si and Mn dissolve in the matrix. Granular Cr7C3 is uniformly distributed. Due to the solute redistribution at the solid-liquid interface, the primary austenite grows from planar to celular and ifnaly to the distinct dendrite crystals. The dendrite crystals have an obvious growth direction perpendicular to the composite layer. 相似文献
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Interfacial characterization of resistance spot welded joint of steel and aluminum alloy 总被引:1,自引:0,他引:1
The dissimilar material resistance spot welding of galvanized high strength steel and aluminum alloy had been conducted. The welded joint exhibited a thin reaction layer composed of Fe2Al5 and Fe4Al13 phases at steel/aluminum interface. The welded joint presented a tensile shear load of 3.3 kN with an aluminum alloy nugget diameter of 5.7 ram. The interfucial failure mode was observed for the tensile shear specimen and fracture occurred at reaction layer and aluminum alloy fusion zone beside the interface. The reaction layer with compounds was the main reason for reduction of the welded joint mechanical property. 相似文献
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以2 mm厚Q235镀锌钢板为基板,直径1.2 mm的4043铝合金焊丝为增材材料,利用BC-MIG焊工艺进行增材试验,得到了成形美观,性能优良的T型材结构. 采用金相显微镜、显微硬度仪、万能拉伸试验机对接头的组织形貌、硬度分布、剪切性能进行研究,获得了沉积层的组织和力学性能的变化规律. 结果表明,沉积层最底部靠铝一侧和靠钢一侧分别形成细长针状和带状Fe/Al化合物,沉积层中部由向上生长的树枝晶组成,而在沉积层顶部的组织没有定向生长的趋势. 剪切试验表明,铝/钢异种金属T型材最大可承受2 108 N的剪切力,剪切角达到13.5°时,受力一侧堆焊层根部发生断裂,堆焊层上无明显裂纹. 相似文献
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Massoud Malaki Hamid Maleki Mohsen Malaki Hamid Reza Roohani 《Journal of Materials Engineering and Performance》2013,22(4):943-951
In this research, a mathematical model for the cold drawing of bilayered strip is presented by the upper bound method. In terms of effective process parameters such as drawing power, drawing force, layer reductions, and bonding strength of the bimetal strip, the effect of total relative thickness reduction has been investigated using the upper bound theorem. Also, bonding strength is calculated using the method. In order to verify the theoretical model, a series of experiments on bilayer strip drawing are implemented by aluminum and mild steel material strips. Through the study, it can clearly been concluded that the presented analytical approach is applicable for simulating and estimating the cold drawing process of the bilayer sheets and it is able to offer a good knowledge through producing the bimetal sheets. 相似文献
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