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  1. Matlsguy

    Heat treat of 2014/2219/355 welded assy

    Swall brings up a good point. Why use a high alloy filler rod like 2319? I understand that you want your weld material to have comparable properties to the parent metal, but high Cu and low Si wouldn't be my first choice because the high Cu/low Si creates other problems such as hot cracking...
  2. Matlsguy

    Heat treat of 2014/2219/355 welded assy

    rayhawk, I would think you need to stress relieve after welding the assembly prior to aging. For the solutionizing process, you might need a fixture to prevent any distortion if you plan on oil quenching. To quench this material you don't need the high quench rates such as that to form...
  3. Matlsguy

    Heat treat of 2014/2219/355 welded assy

    Rayhawk, I just checked my ASM Heat Treating Handbook. I need to make a few points. 325F (162C) is too low a temperature to stress relieve the fixture after welding. That temperature is the optimal aging temperature for these alloys. To stress relieve, you need a greater amount of diffusion...
  4. Matlsguy

    Heat treat of 2014/2219/355 welded assy

    Hello Rayhawk, How about fully solutioning the assembly after you weld the new parts into it? Then age it as an assembly. Regards, matlsguy
  5. Matlsguy

    massive carbides in 17-7PH stainless steel

    metldude, Since Ti is an excellent carbide former I would guess that every 17-7 spring will have TiC carbides. If the TiC carbides were round and not elongated through the grain boundaries you shouldn't have abnormal mechanical issues. Remember its better that you form TiC carbides rather than...
  6. Matlsguy

    Welding Distortion Prevention

    Hello, I am familiar with the common practices in welding distortion prevention - i.e. preheating, using opposing welds, or using fixuring to restrict plastic deformation to the fusion zone. A fully restrained weld will still contract elastically when the clamps are removed. I was wondering if...
  7. Matlsguy

    Stress Engineer !!

    I would like to include that to be an FEA analyst you do not need a 4-year degree. You could train someone in CAE with about two years of schooling. Of course, that person would not understand the machinery of FEA or know how to perform the closed-form solutions of simpler models. Mechanical...
  8. Matlsguy

    Recrystallization temperature for annealing

    Salvatio, Why is so important that the annealing time be calculated if you can directly measure the material condition? What condition do you want to test the material in? Fully annealed? If you arn't sure if the material is fully annealed condition ask your development dept. to provide you...
  9. Matlsguy

    Natural frequency

    Tekm, For the Ti component what geometery are you talking about? The natural frequecies are going to depend on the geometry of the part. You are asking a very specific question that cannot be answered without an FEA modal analysis. A modal analysis should give you your natural frequency...
  10. Matlsguy

    Any FEA books recommended?

    Johnsmith, As a materials engineer who uses FEA for anything from fluid flow, thermal, stress analysis in modeling casting processes I can that it's best to learn from the theoretical books to develop a practical understanding of FEA. Don't fall into the trap of using FEA programs as a crutch...
  11. Matlsguy

    Weldability of Inconel 713

    Because I know for a fact that we don't weld in the over-aged condition. Regards Matlsguy
  12. Matlsguy

    Weldability of Inconel 713

    Unfortunely the article: WELDABILITY OF NI-BASE HEAT RESISTING SUPERALLOY --MAIN CAUSE OF WELD CRACKING IN HEAT AFFECTED ZONE OF INCONEL 713C isn't free. Does the author suggest some pre-weld heat treatments. I found some heat treaments for IN 738 (Soln at 2100 F for 2 hours and over-age at...
  13. Matlsguy

    Weldability of Inconel 713

    Hello, Probably to no ones surprise we are experiencing problems with welding In 713. Cracks are showing up on xray in the heat affected zone (HAZ)for about half the parts we weld. I'm taking it upon myself to fix this problem. My question is are In 713 alloys more suceptible to Strain Age...
  14. Matlsguy

    Surface Recrystallization During Machining

    Here is a little more information. I did a Kallings #2 etch and it brought out precipitates along the grain boundaries near the surface. We supply the 310 material in the solutionized condition and then the part gets machined. Has anyone seen chromium carbide precipitation as a result of...
  15. Matlsguy

    Surface Recrystallization During Machining

    A 310 austenitic alloy. Regards Matlsguy
  16. Matlsguy

    Surface Recrystallization During Machining

    I know theoretically it's possible because in machining you are plastically deforming the metal and the metal can get very hot under the wrong machining conditions. Has anyone ever seen recystallization resulting from a cutting process ? Thanks Regards, Matlsguy
  17. Matlsguy

    spring wire for sea water

    Ibreakstuffdigitally, Your challenge is weighing fatigue requirements vs. corrosion resistence. I need more information about the spring loading (load vs time data) before I recommend a material. As a rule of thumb as the fatigue resistence goes up the chemical corrosion resistence goes down...
  18. Matlsguy

    Metallurgical Engineering License

    Hello, I have a BS and MS in Materials Science/Engineering. I want to get my PE license but unfortunately where I work there are no licensed metallurgical engineers. I work as a metallurgical/process engineer in an aerospace investment casting facility. My question is do I absolutely need to...
  19. Matlsguy

    DRYING

    mechnano, I work in the investment casting industry so I have some background in the drying of ceramics. First off, let me give you a good reference that explains the theory behind drying: "Theory of Drying". Journal of the American Ceramic Society. Vol - 73. Pages 3-14. 1990 by Gearge W...

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