Single-crystal (SX) nickel aluminide alloys have potential for structural applications where hightemperature strength and oxidation resistance are required. In this work, SX deposits of the Ni3Albased IC221W alloy were produced on a SX Ni-base superalloy substrate by means of the laser-engineered net shaping (LENS) process. The microstructure of the deposits was characterized. The effects of pr...

In this paper, the effect of microstructure on the thermal conductivity of plasma-sprayed Y2O3 stabilized ZrO2 (YSZ) thermal barrier coatings (TBCs) is investigated. Nine freestanding samples deposited on aluminum-base superalloy are studied. Cross-section morphology such as pores, cracks, m-phase content, grain boundary density of the coated samples are examined by scanning electron microscopy...

Polycrystalline materials are generally thought to have grain size distributions that correspond to log-normal. Statistical volume elements can use such geometric shape distributions to simulate single-phase polycrystals. When the log-normal distribution is used for grain size, however, it can give rise to nonphysical large grains that cannot be practically accommodated in finite simulation vol...

In our previous works, the effects of forging and heat treatment variables on microstructure evolution mechanical properties have been studied for an ingot-metallurgy Re-bearing nickel base superalloy. To overcome issues associated with production large-scale ingots fine-grained workpieces, in present work, effect hot was a superalloy prepared via powder metallurgy. The purpose study to reach p...

A coarse and a fine dendrite structure were produced using the newly developed DS-superalloy ExAl7 ( IN792 with 2-3 wt.-% Re) by changing the conditions of directional solidification. The two microstructures differed in their primary dendrite arm spacing by a factor of 1.6. During aging, very fine TCP phase precipitates (length approximately 20 m, volume fraction ~ 1 %) were precipitated in the...

Haynes 25 alloy (also known as L-605 alloy) is cobalt based super alloy which has widely applications such as aerospace industry, turbine and furnace parts, power generators and heat exchangers and petroleum refining components due to its excellent characteristics. However, the workability of this alloy is more difficult compared to normal steels or even stainless. In present work, an experimen...

This paper presents the results of measurements of liquid metal fluidity and linear shrinkage of nickel alloy IN-713C in vacuum induction melting furnace Balzers VSG-2. Because of limited volume of the furnace chamber special models for technological trials were designed and constructed to fit in the mould of dimensions 170x95x100mm. Two different designs of test models were proposed: horizonta...