共查询到20条相似文献,搜索用时 62 毫秒
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耐热铝合金及其热稳强化相 总被引:10,自引:0,他引:10
本文对快速凝固耐热铝合金的研究进展做了最新综合评述,首先讨论了耐热铝合金的主要特征,然后着重从结构.点阵参数,以及在铝合金中形貌特点、粗化率等方面对较成熟的耐热铝合金中热稳定强化相进行评述. 相似文献
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快速凝固Al-Fe-V-Si-Zr-Ti合金粉末组织结构的TEM观察 总被引:1,自引:0,他引:1
以Al-Fe-V-Si和Al-(Zr,Ti,V)两个合金系为基础,组成了Al-Fe-V-Si-Zr-Ti合金。对超声气体雾化快速凝固Al-Fe-V-Si-Zr-Ti合金粉末中小于61μm的粉末进行了研究,在小于40 μm的粉末中有两种类型的由球状相和胞晶组成的组织,在50~61μm的粉末中,某些区域有片状组织存在。对析出相研究表明,在小于61μm的粉末中只有Al12(Fe,V)3Si和Al3(Zr,Ti,V)两种析出相,新合金达到了预期设计目标 相似文献
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采用腐蚀失重法和极化曲线的测定,研究了FVS0611,FVS0812,2618,2618+Sc,2014,6061合金在人工模拟海水和海洋环境中的耐蚀性能。结果表明:2014,2618和2618+Sc合金腐蚀较严重,RS/PM生产的FVS0611,FVS0812和6061合金腐蚀速率较小,出现明显的钝化现象,并因为加工残余应力导致出现钝化-腐蚀-再钝化现象。 相似文献
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快速凝固耐热铝合金的力学性能和强化机制 总被引:1,自引:0,他引:1
本文根据大量的资料,以Al-Fe-V-Si为例,对快速凝固耐热铝合金的力学性和强化机制进行了详细的论述,可供铝加工厂从事合金及其性能研究的人员参考。 相似文献
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采用氮气雾化制粉及冷等静压制取实验样品,通过对快速凝固粉末及冷等静压坯的脱气实验,成功地使粉末表面呈非晶态含水的Al_2O_3·3H_2O氧化膜转变为晶态的脆性的γ-Al_2O_3。研究发现:该粉末的最佳脱气温度为400℃左右,冷等静压坯的最佳脱气温度为450℃;通过干收集的粉末中结晶水多于吸附水,且其结晶水和吸附水均远远少于水收集粉末中的结晶水和吸附水。 相似文献
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2D70耐热铝合金铸态组织研究 总被引:1,自引:1,他引:1
利用光学显微镜、扫描电子显微镜、能谱分析、X射线物相分析、透射电子显微镜研究了2D70耐热铝合金半连续铸锭的铸态组织.研究结果表明:2D70耐热铝合金铸态组织为粗大枝晶组织,枝晶间蜂窝状共晶相为AL,A12CuMg/A12Cu,合金中含有大量块状相和条状相,能谱分析显示为含Fe,Ni相,铸态合金中Cu,Fe,Ni元素偏析严重.合金铸态相主要为а(Al),S(Al2CuMg),0(Al2Cu),Al7Cu2Fe,Al7Cu4Ni,Al9FeNi相. 相似文献
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《Baosteel Technical Research》2010,(Z1):89
Nickel-base superalloys are high performance materials subject to severe operating conditions in the high temperature turbine section of gas turbine engines.Turbine blades in modern engines are fabricated from Ni-base alloy single crystals which are strengthened by ordered g’ precipitates.Turbine disks are made from polycrystal line Ni-base alloys because these components have higher strength requirements(due to higher stresses).By increasing the upper temperature limit for the next generation of disk materials,the aviation industry will see significant environmental as well as cost benefits. Researchers in the High Temperature Materials Center of the National Institute of Materials Science of Japan have recently completed their work on a new kind of disk alloys.The new disk alloys,a kind of nickel-coble-base superalloys processed by a normal cast and wrought(C & W) route,can withstand temperatures in excess of 725 degree centigrade,a 50-degree increase over C&W disks currently in operation. In this presentation,the author shows the design idea,workability and properties of these Ni-Co-base superalloys. Furthermore,the evaluation of the processing and microstructure on a full-scale processing of Ni-Co-base superalloy turbine disk are described,which demonstrated the advantages and possibility of the Ni-Co-base disc alloys at the component level. 相似文献
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Yu. V. Naidich A. A. Bugaev A. A. Adamovskii V. A. Evdokimov V. P. Umanskii N. S. Zyukin 《Powder Metallurgy and Metal Ceramics》2008,47(3-4):191-196
A new diamond-hard alloy macrocomposite material consisting of diamond grits (0.5–0.8 mm or more in size) and a WC-Co matrix has been developed. The material is characterized by high mechanical properties of the matrix (the same as for WC-Co monolithic hard alloys) while diamonds remain completely intact (no graphitization or dissolution in cobalt melt). This process does not require superhigh pressures. Hard-alloy samples sintered beforehand in conditions that ensure the maximum mechanical properties (1450–1500°C, 30–60 min holding) are used as initial materials. Hollows (cells) or ditches of specific sizes (depth, width) are made in these samples with mechanical or electrophysical methods, and then diamond crystals (grits) commensurate with the hollows, cells, or ditches are placed in them. Vacuum infiltration (brazing) at moderate temperatures (900–1150°C) with adhesion-active alloys (or metallized diamonds) is the final stage in the formation of the composite. Therefore, strong adhesion-mechanical fixation of diamond grits in the hard-alloy matrix is ensured. The new material is efficiently used in diamond bits. 相似文献
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C-HRA-3耐热合金奥氏体晶粒长大动力学 总被引:2,自引:1,他引:2
通过显微组织观察和理论模型分析,着重研究了C-HRA-3耐热合金奥氏体晶粒长大动力学。固溶处理温度范围为1 125~1 200 ℃,每一温度下分别保温0~120 min后水淬。结果表明,该合金奥氏体平均晶粒尺寸随固溶温度的升高和保温时间的延长而不断增大,长大规律符合Beck方程。在1 150~1 200 ℃范围内,晶粒长大的平均激活能[Q]为459.07 kJ/mol,并建立了该合金的奥氏体晶粒长大动力学方程,利用该方程预测的平均晶粒尺寸值与实测值符合较好。 相似文献
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为了探究不同铝含量对X10CrAlSi18铁素体耐热不锈钢高温氧化行为的影响,采用恒温氧化方法对0.63%Al 和1.06%Al(质量分数)两组钢在700 ℃空气下进行高温氧化研究,测定和计算了氧化增重和平均氧化速率,观察分析了氧化形貌与氧化物相组成。结果表明,两组钢均达到了完全抗氧化级别,但1.06%Al钢的氧化增重和氧化速率均小于0.63%Al钢,表现出较好的抗高温氧化性;两组钢氧化膜均由3层组成,内层为Al2O3和SiO2,中间层为Cr2O3和Fe2O3,外层则为MnCr2O4和FeMn2O4;随着铝含量的增加,氧化膜较为连续、致密,且与基体之间附着性较好,同时内氧化明显减少。 相似文献
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