Avrami equation help

[james_blakesley]

Good evening

I am after some help. I have a set of tensile results that I need to produce a graph using the avrami equation. Would somebody be able to give me some tips of where to start. I cant figure out how the results would fit into the equation

kind regards
James

[Cake of Doom]

The JMAK gives you the fraction of transformation and a time interval so, I suppose, an x-y type of graph could be the simplest form.

[james_blakesley]

Thanks for you reply, I am just unsure how to go about this, I obviously have time / load / extension for the tensile test.

How does this fit into the avrami equation y=1-e^kt(^n)? I 'm guessin t=time, y=extension, if that's right how do I find K & n?

thanks
James

[Kelly_Bramble]

If you have test data just create a x and y column then a line graph in excel. The Avrami Equation will normalize the selected data given not report exact data.

[james_blakesley]

so the x / y graph would be stress strain as per normal way to show tensile results? As the avrami is fraction of transformation vs growth (nucleation). How do I change a graph to show this if that's the case?

regards
James

[Kelly_Bramble]

You need a sufficient number of x y data for the stress train curve.. That's all - extrapolation should be OK for gap in the data.

[james_blakesley]

is this not what a avrami curve is? if so how do you convert stress/strain to this? Unless I've got it completely wrong.

regards
James