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  1. mdighe

    Excel2000 and Excel 97 VBA CODE

    I have written some code in Excel 2000 but need to run the same macro on a machine with Excel 97. I do not have the option of upgrading 97 to 2000. Is there a list available that tells me the commands new in excel2000? I could use such a tool to make sure that the macro is excel97 compliant. thanks
  2. mdighe

    Question about emission test

    Hi I have a 92 honda accord that failed the emission test. The car is very well taken care off (I mean oil change every 3000 miles, all the scheduled maintenance). Never taken it to anyone else but the dealer. What is surpriseing is that only the NOX failes (1400 instead of 910) but the CO and...
  3. mdighe

    High HT Transfer, H Corrosion Rest pipe

    check the materials that are used for radiant tubes in heat treating furnaces. The dimensions and temperature ranges are closer to what you are looking for. Also graphite can be a good option. It has good HT coefficient, dimensionally stable at temperatrues upto 2400F and good compressive strength.
  4. mdighe

    difference between thermal diffusivity and temperature diffusivity

    I am not a guru in solidification theory, but from what I know, The thermal diffusivity if the crytal is a measure of the rate at which heat is carried from the center of the crystal to the surface of the crystal. Once this heat energy reaches the surface of the crystal, it has to be conducted...
  5. mdighe

    Induction Hardening Cracks

    Hi I am in process of analyzing cracked gears that were induction hardened. I have still not looked at the actual part but based on the process info I have received, I found the following to be of significane 1] Some overheating during induction heating 2] There was no stress releif done on...
  6. mdighe

    Project - Build a small steel frame - Braze/Weld?

    Hi The welding steel is most probably a low carbon steel such as 1008/1010. How big is your part? The best way to braze would be decided by the size of the part. We have torch brazed parts that are as small as 1 inch long successfully. The advantage of brazing is that the joint strength is...
  7. mdighe

    Question about meshing

    I am trying to mesh a solder joint. As a first step in that dierction, I am working on a simple problem. The model consists of two plates, a copper palte and a steel plate. I want to have a perfect contact/joint between the two. I want to load this bimetallic model amd see the stress and...
  8. mdighe

    Diffusion coefficient

    Can any one help me with the diffusion coefficient for boron in austenite and ferrite? Thanks
  9. mdighe

    what does 'VS' mean in 38MnVS6?

    38MnVS6 Mn- Manganese V- vanadium S- Sulphur Thanks
  10. mdighe

    Question from a newbie to FEA

    Hi I am a relatively new user of FEA. I am using MSC Nastran for windows. I am working on a solder joint modelling. As a first step I have picked a very simple model, to learn the technique to solving a joint. The model consists of a lead-tin plate sandwiched between two copper plates. I am...
  11. mdighe

    Machanical properties of casting and forging

    Depending on the material, there can be a great difference between cast and forged materials. Both techniques are developed to get a near net shaped part, but that is where the similarity ends. A very common analogy is the bread dough. If you just mix the bread flour and water, and bake it...
  12. mdighe

    Easy Test Needed To Tell 4140 From Carbon Steel

    I had opportunity to work in the raw materials lab in a big overseas automotive manufacturer during my co-op. All this lab did was check the incoming raw forgings and casting. I dont know the name of the instrument, but it involved striking an arg between the part and an electrode and looking...
  13. mdighe

    Cast iron

    I have cast iron with 3.8%C and 14% Cr. I need to heat treat it. 1] Anneal it, and the harded it. What are the hardening temperatures recommended for this alloy? I know because of the high Cr content, I will have to increase the austenizing temp to get Cr in to solution. Is 1750F a good temp to...
  14. mdighe

    "Cryo" Tempered Razor Blades for Longer Life??

    I have come across a process called Cryotreatment. It is not similar to the deep freeze usually done after HT. This process is more involved and consists of cooling the part to about -320F at a controlled cooling rate, holding for 12-24 hours and bringing it back to room temp. at a controlled...
  15. mdighe

    Heat Treat 4130

    Hi I have considerable experience with 4330H material. We have quenched it in oil (upto 1.5 inch thick) and tempered it at 500F to get Rc 46 or higher. It has worked well for us and did not have any problems with cracking. You should be able to oil quench 4330 and still get Rc 47 through out...
  16. mdighe

    Kolsterizing

    Hi What is Kolsterizing? Is it a nitriding process or a carburizing process? What temperatures is it carried out. I was thinking of substituting Kolsterizing with Ion Nitriding for Stainless Steel. Any problems to be anticipated? Thanks

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