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Niobium carbide thin films have been deposited on Si(100) substrates by direct current reactive magnetron sputtering using CH 4 as a carbon source. With increasing FCH4 from 4 to 22 sccm, the carbon content for the film increases from 32.7 to 68.7 at.% gradually, accompanying with a phase transition from hexagonal-Nb 2 C to cubic-NbC, and at the highest carbon content, the film exhibits...
A novel method of manufacturing iron-based interlayer based on a duplex stainless steel and a melting-point-depressant element (B) was developed. As the B content was enhanced in the range of 0–3.93 wt.%, the melting temperature of the produced alloy decreased. Transient liquid-phase (TLP) bonding of the duplex stainless steel was carried out using a selected filler material with 3.93 wt.% B and the...
A nanostructured layer was fabricated by using fast multiple rotation rolling (FMRR) on the surface of Ti-6Al-4V alloy, with grain size 10–19 nm in the top surface layer by means of XRD and TEM analysis. A deformation layer with thickness about 80 μm is clearly observed in the cross section of FMRR sample. The microhardness of the FMRR sample has an obvious change along the depth from about 368 HV...
Electron beam welding (EBW) with multi-beam is a novel method to decrease weld cracks, which is suitable for welding the parts in aero industries. We studied EBW with multi-beam on high temperature titanium alloy, which was refers to simultaneous EBW with electron beam (EB) preheating or post-heating. We proposed the ratio of the power for welding and preheating or post-heating, and modeled temperature...
Diffusion bonding of TiAl intermetallic to Ti 3 AlC 2 ceramic was carried out using Zr and Ni foils as interlayer. The interfacial microstructure and joining properties were characterized by electronic microscopy investigation and shear strength test, respectively. The microstructure observations revealed that the general interfacial microstructure of the joint bonded at 850 °C was...
The influence of post ageing treatment on creep behaviour of aluminide coating prepared by low-activity high-temperature on a Ni-based single crystal superalloy was investigated. The results showed that the aluminide coating reduced the creep behaviour of Ni-based single crystal superalloy. The decrease in creep behaviour may be due to the change in microstructures after aluminizing treatment. However,...
A new route for degassing of molten aluminum alloys has been developed via the electromagnetic directional solidification. We evaluated the degassing feasibility and mechanism for the formation and evolution of the porosity. As expected, it enabled the migration of porosity to the upper end instead of the distribution in the whole sample. Furthermore, we investigated the effects of various pull-down...
A novel rapid salt bath nitrocarburizing technology was primarily developed by additionally applying direct current (D. C.) electric field on the basis of traditional technique (NM). The results showed that D. C. electric field could significantly enhance the nitrocarburizing efficiency, shorten the holding time and decrease the treating temperature comparing with the NM. To get a composite layer...
Gas tunnel type plasma spraying is a renowned technique due to its greater advantages than other conventional plasma spraying followed by high speed and high energy density plasma jet. Furthermore, this is a simple and novel process for producing dense metallic coatings with and without secondary phases such as oxides and intermetallic phases under selective operating parameters. The present work...
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