Hello Colleagues,
In advance of a thermal spray coating process, a sand blasting
with abrasive grit material (e.g. corrundium) is required
to reach a sufficient bonding strength of the coating.
The grit blasting process leads to embedding of grit into the substrate as well as to small...
Hello!
Does anybody know if it would help to use a single crystal alloy if I have problems with wet intergranular corrosion?
No grain boundaries, no chromium depletion at the grain, no possible attack?
Or is it not as simple as I am thinking?
Thanks for your comments in advance!
Feldmann
I am planning a comparative testing campaign of various Ni/Co/Fe superalloys designated to be uses in a combustion chamber (wall temperatures 1500°F, gases: H2O vapour, CO, NOx, CO2, NHx, H2).
The combustion chamber has a service life of approx 100h.
I have at the moment approx. 20 different...
Dear Colleagues,
Do you know if it is beneficial for the welding result to remove scales from superalloys prior to EB welding?
We have many years experience with alloy 75 EB welding. After mechanical machining, in some cases there is a time duration of several weeks (storage under ambient...
Dear Colleagues,
I am planning a series of Huey Tests with different materials, each material (a piece of tube) with two different heat treatments (EB welding and oven treatment for 5h at 1500°F).
So according to the standard, it is not allowed to put 2 specimen in one vessel for Huey testing...
Hi everybody,
I am currently searching for a method to increase the total emissivity of a metallic surface to 0.85 or higher at temperatures up to 3000F (1650°C).
There are many manufacturers of plasma sprayed coatings on the market stating that their products (like iron tianate, aluminium...
Dear colleagues!
I am currently engaged in a project evaluating several Ni/Co/Fe-base cast and wrought super alloys with respect to their sensitivity
towards wet intergranular corrosion.
Within our product, temperatures up tp 1000-1500 F may occur, followed by colder phases where corrosive...
Dear colleagues!
I have to measure the pressure drop of orifices.
Now I am reflecting on my meausrement method.
In the vicinity (up- and downstream) of an orifice,
the flow is disturbed.
After the orifice, the static pressure increases again
while the streamlines are attaching again at the...
Dear colleagues!
I have again an other hydraulic challenge:
Whe perform pressure drop measurements with water at ambient
temperature.
Now I have to predict how the pressure drop would change if, for example, the temperature rises or a different liquid will be used with other fluidic...
Good Morning again :)
I have an other question regarding the discharge coefficient:
Cd=m./(A0*sqrt(2*rho*DP)) derived from energy and mass conservation formulas:
with
CD=discharge coefficient [/]
m. = mass flow dm/dt [kg/s]
A0 = orifice area [m**2]
rho = water density (function of temp)...
Good Morning!
I have a question concerning the water flow in a hydraulic
system. In different positions of the system, I have
to install sharp edged orifices to regulate the mass flow.
Now I am searching for a good approach for testing & calculations.
For the orifice, I determine the pressure...
