Densification and distortion of W-Ni-Fe tungsten heavy alloys during liquid phase sintering are modeled using constitutive laws of grain growth, densification, and deformation. The models are ‘‘calibrated’’ via carefully designed experiments to obtain the necessary parameters to enable modeling. Metallographic analysis of quenched samples is used to obtain grain size data as functions of time a...

Mullite and mullite/ZrO2-7wt.%Y2O3 coatings could be thought among the main protective layers for environment barrier coatings (EBCs) to protect Si-based substrates in future gas turbine engines. Considering that feedstock of the compound powder is not commercially available, two powder processing routes Spray Drying (SD) and Flame Spheroidization (FS) were implemented for both types of powders...

Abstract The spherical tungsten powders were prepared by a low-power DC laminar plasma torch. At discharge current of 50 A, the powder fed downstream cannot be spheroidized using Ar discharge, while small number particles can observed with upstream feeding. When N 2 is added to working gas, input power increased maintain same current, which leads increase jet length, thereby expanding effective...

In this study, the comprehensive properties of a P22 high-temperature steam pipeline with moderate spheroidization were evaluated after more than 11,700 h operation through series physico-chemical testing, especially for creep test. The remaining life was analyzed and predicted by θ parameter method, to guide normal pipeline.

κ-carbide () in high aluminium (Al) steels is grown from austenite () via + or α+ ( represents ferrite), and is a lamellar structure. This work demonstrates that the formability of high Al lightweight steels is affected by the lattice misfit and interface shape between  and matrix. The cold workability can be improved by either to change the steel chemical constitution or to implemen...

Passing one electric-current pulse through deformed pearlitic steel wires at room temperature causes the formation of cementite particles around 30 nm in size. This is found not only in some particular locations but throughout the cementite area, which reveals a different mechanism from traditional spheroidization of cementite plates because the latter leads to the formation of particles with m...

A Ce-containing Ni-based tungsten carbide layer was prepared on the surface of Q345 steel by plasma arc cladding technology. The effect CeO2 additions microstructure and properties investigated. results showed that had no pores cracks their microstructural composition remained unchanged with in powder. After adding into powder, Ce atoms were absorbed particles to promote dissolution spheroidiza...

The effect of the initial microstructure and soft annealing temperature on cementite spheroidization softening is studied an AISI 5140 hot-rolled wire. In coarse pearlite (λ: 0.27 μm), progresses slowly under subcritical treatment, does not achieve minimum G2/L2 IFI rating defined in ASTM F2282 to be used cold forming operations any treatment studies. Fine 0.10 μm) upper bainite microstructures...