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1.
《Ceramics International》2022,48(6):8025-8030
In order to meet the high demand for joining ceramic/superalloy composite structure in extreme environments, a novel high-temperature resistant adhesion technique was developed for joining ZrO2 and Inconel 625 by applying an aluminum phosphate emulsion/zirconium sol based adhesive. With increasing temperature, a series of reactions occurred in adhesive, and its high-temperature bonding was attributed to the formation of a composite structure containing various ceramics and intermetallics. The adhesive after RT curing could find direct applications in extreme environments, and provide bonding strength no less than 2.5 MPa in the temperature range of RT-1100 °C. The bonding strength was higher than 4 MPa in the temperature range of 800–1000 °C, which was further attributed to the formation of an effective CTE-gradient relationship among ZrO2, adhesive and Inconel 625, as well as the interfacial reactions between the two substrates. The work broadened the application of adhesion technique and brought new ideas for joining dissimilar engineering materials. 相似文献
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V. Bushlya A. Bjerke V.Z. Turkevich F. Lenrick I.A. Petrusha K.A. Cherednichenko J.-E. Ståhl 《Journal of the European Ceramic Society》2019,39(8):2658-2665
During a metal cutting process, chemical wear can become the dominant mechanism of tool degradation under the high temperatures and contact pressures that arise between the tool and the metal workpiece. This study focuses on the chemical and diffusional interactions between superalloy Inconel 718 and cubic boron nitride (cBN) tool material with and without TiC binder. It covers thermodynamic modeling and experimental tests in the pressure range of 0.1 Pa to 2.5 GPa at temperatures up to 1600 °C. The methods used include diffusion couples under both vacuum and high pressure, transmission electron microscopy (TEM) analysis and in-situ synchrotron observations. It is shown that cBN is prone to diffusional dissolution in the metal and to reactions with niobium, molybdenum, and chromium from Inconel 718. Adding TiC binder changes the overall degradation process because it is less susceptible to these interaction mechanisms. 相似文献
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High entropy alloy(HEA) of Fe Co Ni Ti Al and Inconel 718 superalloy were firstly transient liquid phase(TLP) bonded by BNi2 filler due to the diffusion of Si and B in the filler to the base metals. The effects of bonding time on microstructure evolution and mechanical properties of the TLP joints were investigated.Owing to the complete isothermal solidification of the joints bonded for 30 min 120 min at 1100°C,no athermally solidified zones(ASZs) formed by eutectic phases were observed in the welded zone. Thus the TLP joints were only composed by the isothermally solidified zone(ISZ) and two diffusion affected zone(DAZ) adjacent to the dissimilar base metals and the negative effect of the ASZ on joint properties can be avoided. In addition, the increase of the bonding time can also make the Ti B2 borides precipitated in the DAZ near HEA and the brittle borides or carbides in the DAZ near IN718 alloy decrease and reduce the possibility of the stress concentration happened in the joints under loading. Therefore, the highest shear strength(632.1 MPa) of the TLP joints was obtained at 1100°C for 120 min, which was higher than that of the joint bonded for 30 min, 404.2 MPa. Furthermore, the extension of the bonding time made the fracture mechanism of the joint be transformed from the intergranular fracture to the transgranular fracture. However, as the brittle borides in the DAZ near IN718 can not be eliminated completely and refining of grains also happened in such region, all the TLP joints fractured inner the DAZ near IN718 alloy. 相似文献
4.
Inconel 718 thin walls were fabricated via electron beam directed energy deposition (EB-EDE) to investigated their microstructure and mechanical properties in terms of the deposition modes. Results revealed that the deposition modes had great effects on the microstructural evolution and thus influenced the mechanical properties. The layered nature and the fine dendrites were produced by the intermittent deposition, while the coarse and irregular cellular crystals were formed under the continuous deposition. The harmful Laves phase was precipitated under both deposition modes. The microhardness and tensile strength of the build-ups deposited intermittently were higher because there were fewer Laves phase. This work provided a new perspective to explain the microstructure differences of multi-layered components formed by EB-DED. 相似文献
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本文针对高速永磁电机转子保护材料镍基高温合金Inconel625的切削性能展开研究。采用仿真软件DEFORM-3D建立了该材料的三维有限元仿真模型,仿真模型采用了Johnson-Cook模型、Usui刀具磨损模型等关键技术。通过仿真得到了切削过程中切削力的变化趋势、温度场的分布特性、刀具磨损、切屑形状等。在结合试验分析的基础上,得到了切削参数对切削力、切削温度、刀具磨损的影响规律。研究结果对Inconel625合金车削过程切削条件的合理选择和刀具使用寿命的提高提供了理论依据,为深入研究Inconel625合金切削机理提供了理论依据。 相似文献
9.
目的探索激光增材制造Inconel718高温合金最理想的固溶处理制度。方法利用激光增材制造技术制备了Inconel 718合金,通过组织观察(光学显微镜和扫描电镜)、能谱分析和维氏硬度测试等方法,研究了固溶温度对其组织、析出相及硬度的影响。结果不同固溶温度对Inconel 718的晶粒尺寸有很大影响。在固溶温度1000℃下保温1 h,沉积层开始出现再结晶现象。当固溶温度继续增加到1080℃时,与沉积态的组织相比,晶粒明显细化且再结晶过程基本完成。此外,不同固溶温度条件下,Inconel718的相析出和溶解行为也有所差异。固溶温度为940℃时,在未溶解的Laves相周围存在明显的δ相,当固溶温度继续提高时,δ相由于固溶作用而数量减少。另外,不同固溶温度处理后的合金显微硬度也表现出规律变化。当固溶温度为940℃时,试样硬度高于沉积态硬度,但是随着固溶温度持续升高,合金的显微硬度开始迅速下降并低于沉积态硬度,1050℃时保持稳定;当温度高于1150℃时,显微硬度继续迅速下降。结论激光增材制造Inconel718合金的热处理制度不同于铸造和锻造的热处理制度,其较为理想的固溶制度为1080~1150℃保温1 h。 相似文献
10.
对激光成形修复Inconel 625合金的工艺特性以及不同区域的组织进行了研究。结果表明:激光成形修复Inconed625合金的工艺范围较宽;激光功率主要影响单道修复层的宽度;扫描速度对单道修复层的尺寸影响较为显著,而送粉率的影响较小。基材的相组成包括γ(Ni-Cr)基体相、大尺寸(约10μm)块状MC型碳化物(M为Nb和Ti)、沿晶界析出的小尺寸(约0.5μm)块状MC型碳化物以及不规则形状的Laves相。修复区组织为呈外延生长的柱状枝晶,相组成为γ基体相、沿枝晶界析出的Laves相以及少量MC型碳化物。层与层界面处Laves相析出急剧增加形成层间过渡区。 相似文献