Found 14 document(s)
Page 1 of 1
-
Quelques exemples de cas de métaux en situation de corrosion pour illustrer ce phénomène auprès du grand public...
-
Decreasing Mn and increasing Cr in the cast Cantor's alloys and in their MC-strengthened versions may have consequences on the refractoriness and on the high temperature mechanical properties. Differential thermal analys...
-
Conventional casting allows producing componentswith complex geome- tries and coarse grains favorable for good creep-resistance at high temperatures. Their weak points are generally their intergrains and interdendritics ...
-
Hafnium carbides have recently demonstrated high interest to strengthen equi-axed polycrystalline superalloys. Notably chromia-forming Nibased alloys reinforced by HfC appeared as being both oxidation-resistant and creep...
-
Two Hf–poorest versions of a high performance chromia–forming nickel–based polycrystalline cast alloy reinforced by HfC carbides were investigated by replacing more or less hafnium by tantalum to reduce production cost. ...
-
Two alloys based on nickel and designed to be reinforced by MC carbides thanks to the presence of Hf and Ta were produced by casting. They were subjected to 50 h-long isothermal exposure at 1250 C in synthetic air with t...
-
La perte de l'oxyde formé au cours du refroidissement succédant à une exposition prolongée d'un alliage métallique réfractaire / superalliage à une atmosphère gazeuse chaude et oxydante est un phénomène aussi important q...
-
A cast Ni-based superalloy strengthened by hafnium carbides was cast and characterized at 1100°C in creep and in hot oxidation. The as-cast microstructure, composed of a dendritic matrix and of eutectic script-like HfC c...
-
For applications at moderate temperature, even in presence of intense mechanical stresses and very aggressive fluids, alloys which are needed can be ones which may be different from the superalloys used as turbine blades...
-
Introduction: Need of metallic materials for applications at particularly elevated temperatures. Complex shapes of many pieces working at high temperature → foundry way Cobalt-based and even Nickel-based alloys not able ...
-
TaC carbides are among the most efficient particles for reinforcing cast refractory alloys and superalloys against mechanical stresses at temperature as high as 1000°C and over. The most common TaC-strengthened superallo...
-
The mechanical reinforcement of polycrystalline alloys at elevated temperature may be achieved by HfC carbides. Generally such alloys must be also resistant against oxidation by hot gases and corrosion by molten substanc...
-
The addition of hard particles in a ductile alloy may lead to a substantial increase in its hardness and in the difficulty to machine it. This work aims to specify the role of chromium carbides in the hardness of cast ni...
-
Cobalt-base superalloys are currently used as bulk materials for parts of aeronautic turbines. These latter support mechanical and thermal constraints. As the lifetime of these parts is limited, the aim of this work is t...