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  1. Kim_W

    RENE N5 microstructure (etched with Kallings 2) why are some regions darkened?

    Thanks for the answer! This week i'll cut some more specimens and do it in that sequence, first DIC, mark suspicious areas and after that electrolytic etchant.
  2. Kim_W

    RENE N5 microstructure (etched with Kallings 2) why are some regions darkened?

    Thanks for the reply. It is indeed tough to find reference material/pictures for this kind of superalloy. It was cold mounted with transparent clarocit and there is indeed a very very small uniform debonding gap between specimen and mounting material (only visible at high mag). However, the...
  3. Kim_W

    White substance under the roof.

    There is some ''filiform'' distribution of the whitish layer. This may happen when the aluminum roof was covered with an isolator (decal, carpet, etc). Was that section of the roof in contact with anything like that which may hold up moisture, accumulated from condensation? Im not an expert but...
  4. Kim_W

    Turbine Housing Scroll Design

    Like Edstainless says, it is to give the car a better and broader torque distribution. The small and big volute generates two different air speeds which will spool up the turbine wheel faster at low rpm. If you do racing, there is no need for twinscroll. Then a single scroll might even be better...
  5. Kim_W

    Where to Buy High Speed Ball Bearings 80000+ rpm

    You can contact Schaeffler, SKF, for high speed bearings. But high speed bearings are usually small because of the inertia of the balls. I used to work at Turbocharger R&D department in Japan, for a well known company. The speeds we were dealing with were 300.000 RPM plus... You can use ball...
  6. Kim_W

    Torque on Wheel Studs

    There is always a bit of clearance between the hub shoulder and rim center hole and certainly no direct contact (at least for modern BMW vehicles). Enough clearance that the hub shoulder is going to corrode a bit during operation, this is quite normal to see. As a result mechanics usually...
  7. Kim_W

    RENE N5 microstructure (etched with Kallings 2) why are some regions darkened?

    Dear engineers, This is my first post and i am new to this very interesting forum. Please excuse me if i did skip the introduction part, i'll try to introduce myself in the appropriate section if this is necessary! Well, this is my metallurgical finding/question: As i work in the aviation...

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