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  1. will123

    Titanium-6Al-4V - Elevated temperature surface protection

    My company is looking at using titanium-6Al-4V for a high temperature application. I appreciate there are better, alternative titanium alloys available, but this is the best available in the neessary timescales. Obviously the reduction in mechanical properties is being designed for. But, the...
  2. will123

    Expanding polymeric beads/ pellets

    Is anyone able to point me in the direction of a company who can supply beads or pellets of a polymer material that can undergo preferably an irreversible expansion or swelling when exposed to elevated temperatures (above 100°C)- basically I require a more controlled version of popcorn!!! I can...
  3. will123

    Worldwide Guide to Equivalent Steels

    Unfortunately for you EN 10025 first appeared in the 1990's. Try the following link for find equivalent metal specification http://www.titex.de/mytecshop/tec.asp?WCI=Std&FID=900&OID=
  4. will123

    Book on Lubrication of gears and gearboxes

    Can anyone here recommend a good book to purchase that goes into details on the lubrication of gearboxs. Typical information I would like include the following: - Functions/ requirements of an oil. The different additives of an oil and reasons for their uses. How does changing the oil...
  5. will123

    Peroxide Etching of titanium for bonding

    While I appreciate your reply. There are a few reported concerns with acid based etching of titanium alloys, namely waste disposal, hydrogen embrittlement of the titanium material and durability of the subsequent bond in high humid and high temperature environments. For these reasons coupled...
  6. will123

    Peroxide Etching of titanium for bonding

    We are currently experiencing some problems with bonding titanium 6Al-4V to epoxy resins- the geometry of the joint in question leaves a lack of access for our standard titanium preparation method; abrasion and then exposure to plasma. Therefore we would like to run some bonding trials after the...
  7. will123

    Supply of Al-Li in UK

    I wonder if any of you can advise of companies which supply aluminium lithium alloys in the UK Thank you in advance
  8. will123

    Hardening and grinding question

    817M40 (equivalent to EN24) is normally supplied in the hardened and tempered to "T" condition. Therefore assuming the strength in this condition is suitable (min yield at 680MPa) for your needs it should not require any further heat treatment.
  9. will123

    heating of magnesium castings

    Are these castings shot peened? If not then the suggestions given above are fine. However if they are shot peened then to avoid degrading the preferential compressive stresses at the surface the exposure temperature should be restricted to no more than 200F (or 93C) according to Mil-S-13165C...
  10. will123

    13-8PH - Strength in Cond. A

    Thank you for the reply. We buy the material through a stockholder and the cert they supply only contains the heat treated information. I will go back to them and get them to pull their records. Thanks
  11. will123

    13-8PH - Strength in Cond. A

    We have a part manufactured from 13-8PH, which has been bonded into an assembly. Unfortunately it has since been discovered the part has missed the heat treatment step to age it. I appreciate all the literature states the material should not be used in the solution treated condition, but could...
  12. will123

    Test House for Wear and Friction Testings

    Can anyone recommend a test house in the UK, which is able to carry out wear testing and measurement of friction coefficients? Thank you in advanced for your assistance.
  13. will123

    Source in the UK for 304N or 304HN

    For a particular application we require the physical properties of an austenitic stainless (density, stiffness, expansion coefficient). The part is of size approximately 800mm by 500mm by 32mm and we are making about 24 units. AISI 304 is ideal apart from one thing, strength, however all other...
  14. will123

    High Expansion Coefficient Steels

    Again thank you for your replies. The application is as a stiffening plate fixed to aluminium components. Therefore I wish to maximise the modulus, which rules out aluminium. I did consider brass, but again the reduced modulus is a factor. The part is stiffness rather than strength limited and...
  15. will123

    High Expansion Coefficient Steels

    Thank you for the responses - I should have added in the original message that the service temperature of interest is in the region of 20-150°C. In this range, according to my reference 201 has a coefficient of expansion of 0.0000157m/m.°C and 305, 304, 302 etc are at 0.0000173m/m.°C. The 300...
  16. will123

    High Expansion Coefficient Steels

    Israelkk, Apologies for causing your annoyance - I cut and pasted my message from Word and unfortunately I did not spot that the Mu did not reproduce correctly.
  17. will123

    High Expansion Coefficient Steels

    I am in the UK and would like to find a source of steel with a expansion coefficient in the region of 20?m/m.°C, preferably in plate form (although larger section bar, which could be forged flat could be acceptable).At the moment we are using austenitic stainless, but ideally need to increase...
  18. will123

    Safe Endothermic Reaction

    I have a need to temporarily keep a liquid cool where there is no available external power supply. For this particular application making use of an endothermic reaction would be a good solution. But I would like for it to be safe. A couple of possible reactions is to dissolve Potassium or...
  19. will123

    Assessment of notch sensitivity

    Is it possible to determine (at least to get a reasonable estimate)the relative notch sensitivity of different materials from their values of the standard mechanical properties, such as UTS, yield strength, elongation etc? Or is the only way to get this information by conducting notched tensile...
  20. will123

    Crack in 303 Stainless Steel

    Thank you for your comments. Certainly, I agree with respect to performance you would not necessarily opt for 303 - either 304 or 316 are better alternatives, but I have been assured that the material has not been changed. However, I am currently in the middle of sectioning an old example to...

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