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Recent content by Chinnia

  1. Chinnia

    Friction Coefficient of Al 6082- steel / Wear

    Thanks for the details. Considering the load and speed conditions of your tests, I think you should have observed some black debris. They are called equiaxed particles and corespond to Regime 1 in the wear maps for Al alloys. Wear and friction coefficient (FC) do not always correlate to each...
  2. Chinnia

    Friction Coefficient of Al 6082- steel / Wear

    Please specify load, speed, geometry (pin-on-dic, etc) and the environment (dry ot lubricated). If it is dry wear, I will be able to help as I have done hundreds of tests with several Al aloys against different substrates.
  3. Chinnia

    Galling with various metal on metal combinations

    As 3.6 pounds load on 75 mm diameter surface is small. It is still in the low wear rate regime where fine black powder debris are produced. these black powder is nothing more than fine particles of Al and steel and not much oxide.(see wear mecahnism maps for aluminium/steel). I could not...
  4. Chinnia

    Stress Corrosion Cracking Testing

    I know it is very late to post. But I have recently joined the forum and I am also interested in this subject. Just expanding on the previous post, I have seen the following be used in the SCC literature: 1. C-ring 2. 3 or 4 point bending 3. Slow strain rate tensile testsing 4. Double...
  5. Chinnia

    Oval Tubing

    You could also try www.tubenet.org which has a good collection of info. best of luck. Chinnia
  6. Chinnia

    Cryogenic Hardening versus Heat-Treating Hardening

    That is why metallurgists are employed in industries - to take the headache away from designers! Enough on boosting my profession. Generally, as-received carbon or low alloy steels come in pearlite and ferrite microstructure. When you heat to around 900 C (Please convert to F), you form...
  7. Chinnia

    Corrosion resistance of PVD coatings ?

    My obervations on PVD coatings: - PVD coatings generally used for wear resistance (e.g. TiC, TiCN, Alumina, CrN, etc). We have seen wonderful wear resistance of 3to5 micron thick CrN in metal stamping operations. CrN on die steel outperformed TiN in that particular situation. - re. corrosion...
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