kb0fhp Posted October 4, 2007 Share Posted October 4, 2007 http://calculations.ewi.org/VJP/TTTCCTPlots.HTML Site allows you to input a chemistry of common elements - and poof - out comes a TTT or CCT diagram D. Scott MacKenzie, PhD Heat Treating (Aluminum and Steel) Quenching (Water, Polymer, Oil, Salt and Mar-Tempering) Link to comment Share on other sites More sharing options...
Mike Lambiase Posted October 4, 2007 Share Posted October 4, 2007 thank you, this is awesome. Mike Lambiase Burning Man Forge E-mail Link to comment Share on other sites More sharing options...
Randy Scott Posted October 4, 2007 Share Posted October 4, 2007 I think the 'calculator' was designed for the metallurgist among us as I have tried to use it and the results do not look like any TTT nor CCT chart I have seen before. Can anyone offer a brief tutorial on how to use it? The upper portion of the calculator is the input area for the percentage by weight of the makeup of the material. That is self explanatory. The bottom portion seems to be the area causing me trouble. Thanks... Link to comment Share on other sites More sharing options...
Howard Clark Posted October 4, 2007 Share Posted October 4, 2007 When I input values of known materials, the graph that comes out is not at all like it should be. It is possible that I do not understand. How does Kelvin comare to centigrade ? (thought it was the same). It is also possible that the cooling rate needs to be increased substantially ? This thing has always confounded me. Link to comment Share on other sites More sharing options...
Mike Blue Posted October 4, 2007 Share Posted October 4, 2007 When I input values of known materials, the graph that comes out is not at all like it should be. It is possible that I do not understand. How does Kelvin comare to centigrade ? (thought it was the same). It is also possible that the cooling rate needs to be increased substantially ? This thing has always confounded me. Zero in Kelvin is rock bottom and equals -273.15 degrees Centigrade and -459.67 Fahrenheit. No molecular movement (and it's really a hypothetical point, at least to current science). Space is warmer at 2.7 Kelvin. Hmpf, didn't know that button worked. My Halfzheimer's is not yet complete... There are three kinds of men. The one that learns by reading. The few who learn by observation. The rest of them have to pee on the electric fence for themselves. Will Rogers Link to comment Share on other sites More sharing options...
kb0fhp Posted October 4, 2007 Author Share Posted October 4, 2007 Actually - it doesn't look too bad. When you input "0" into the temperature - it defines the austenitizing temperature as Ae3...let me try and find a simple one and I can compare data. D. Scott MacKenzie, PhD Heat Treating (Aluminum and Steel) Quenching (Water, Polymer, Oil, Salt and Mar-Tempering) Link to comment Share on other sites More sharing options...
kb0fhp Posted October 4, 2007 Author Share Posted October 4, 2007 (edited) OK - when looking at a common steel that you might encounter/use - I chose 6150, and used the same parameters for each - same chemistry, austenitizing temperature, time scales, etc. Within the limitations of the calculations, it doesn't look too bad. Remember in the calculated file to subtract 273K to get the C temperatures. The basic phase fields tend to correspond with temperature and time - actually pretty well. THere seems to be a disconnect with the TTT diagram and the Bainite start temperatures. But overall - I find that it is pretty close on the whole - good enough that I would use the calculated data with a bit of understanding and caution. Certainly, I would compare several more to verify - but on this first comparison - it is pretty good. The CCT diagram appears to match pretty well....One thing that you have to pay attention to is the maximum cooling rate - note the differences when I changed the maximum cooling rate from 100K/s to 35 K/s Edited October 4, 2007 by kb0fhp D. Scott MacKenzie, PhD Heat Treating (Aluminum and Steel) Quenching (Water, Polymer, Oil, Salt and Mar-Tempering) Link to comment Share on other sites More sharing options...
Guest Kyle Hershey Posted June 29, 2008 Share Posted June 29, 2008 Oh! Man!! The link is down!! Damn damn damn!!! Link to comment Share on other sites More sharing options...
DFogg Posted June 29, 2008 Share Posted June 29, 2008 New link CCT/TTT calculator Don Fogg Link to comment Share on other sites More sharing options...
Guest Kyle Hershey Posted June 29, 2008 Share Posted June 29, 2008 Thank you kindly Don!! I have been looking for a calculator like that!! Link to comment Share on other sites More sharing options...
kb0fhp Posted June 29, 2008 Author Share Posted June 29, 2008 Thanks Don D. Scott MacKenzie, PhD Heat Treating (Aluminum and Steel) Quenching (Water, Polymer, Oil, Salt and Mar-Tempering) Link to comment Share on other sites More sharing options...
Bennett Posted June 30, 2008 Share Posted June 30, 2008 (edited) Wha Edited April 29, 2011 by Bennett Link to comment Share on other sites More sharing options...
Justin Barnett Posted February 11, 2011 Share Posted February 11, 2011 Am I correct in thinking that this could help you heat treat damascus more accurately? Average the percents of alloys in the different steels you use (by weight) and enter those figures in. Or would the fact that only carbon migrates quickly make that inaccurate? Link to comment Share on other sites More sharing options...
Doug Lester Posted February 11, 2011 Share Posted February 11, 2011 That might work if you are making damascus with just 10XX series steel. If you have other types of steel, let us say O1 with 1070, the carbon will equalize and, assuming equal parts, you will end up with around 80 points of carbon evenly distributed throughout. The nickel and tungsten from the O1 and the manganese from both steels diffuse very slowly in austinite. Extremely slowly might be more accurate and you will have bands of these alloys in different concentrations thoughout the damascus billet. The ITT diagrams can still be of an assistance in choosing which of the steels that you are going to heat treat for as a starting point. You may have to experiment a bit to get the best heat treatment. Doug Lester HELP...I'm a twenty year old trapped in the body of an old man!!! Link to comment Share on other sites More sharing options...
Bertie le Roux Posted June 21, 2011 Share Posted June 21, 2011 These calculators can be very usefull but it is hard to take into consideration all the factors that influence the shape of a TTT or CCT curve (there are MANY). Usually they are only really usefull if used in the "context" they are designed to be used in... i.e. they are based on a combination of empirical data and theoretical physics in a certain application or composition range and can tell you what the result of a certain degree of variation would probably be. Some of the variables they don't give you an option to input may very well be making a difference because in your application it is varied but in the intended application it is a constant or at least a different typical value. Usually the TTT's are a bit more accurate than the CCTs due to a very variable cooling rate being taken into consideration on CCTs but not TTTs. Even if nothing looks the way it "should", it is very interesting playing with these to get a bit of a gut feel for what does what Link to comment Share on other sites More sharing options...
Naeem Posted April 5, 2019 Share Posted April 5, 2019 THE LINK IS DOWN GAYS ... ANYONE HAS NEW LINK PLEASE,,, I REALLY NEED IT FOR MY RESEARCH ???????? Link to comment Share on other sites More sharing options...
Jerrod Miller Posted April 5, 2019 Share Posted April 5, 2019 It has been broken for a while. I sent an email to the folks at EWI a couple years ago asking about it, but never heard back. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now