Predict the phases formed at the center of a 25 bar of 1080...

Predict the phases formed at the center of a Ø25 bar of 1080 steel when it is quenched from slightly above the eutectoid temperature in oil with agitation. (20 Puan) TABLE 13-2 The H c quenching media Medium Oil (no agitation) Oil (agitation) H2O (no agitation) H2O (agitation) Brine (no agitation) Brine (agitation) Coarse Pearlite Fine Pearlite Martensite Martensite + Bainite Martensite + Pearlite

Transcript

00:01 So we can write here by the following ttt diagram, we can suggest the following points.

00:23 So what advice we can give here? by seeing the a point we can write here we should quench we should quench in 570 570 degree centigrade bath for 2 second bath for 2 second and then and then quench quench in 400 degree centigrade bath for nine second bath for nine second and now quench in 30 degree centigrade bath and now quench in 30 degree centigrade bath this is the first advice okay now seeing the second point in the question we can give the following suggestion that to quench in 670 degree centigrade bath for 10 second okay and then quench with and then quench with 30 degree centigrade bath okay so by seeing the sec sorry by seeing the third point we can write here we we have to quench with 670 degree centigrade bath for 10 second and then quench with 400 degree centigrade bath.

02:32 Now seeing the fourth point given in the question we can write the suggestion here that quench in next process will be quenching 670 degree bath for almost 150 seconds okay now another advice that we can give is quench in quenching 570 degrees centigrade bath for 10 second bath for 10 second okay now after seeing the next point we can write here that quench in 30 degree centigrade bath for some time but for some time and the next point here that is g will be quench in 400 degree centigrade bath for 12 second and then quench in 30 degree centigrade bath bath and then quench in 30 degree centigrade then the h point here will be quench in quench in 670 degree centigrade bath for 10 second bath for 10 second and then quench in and then quench in 570 degree centigrade bath for 10 second bath for 10 second okay now now the i advice will be quench in 670 degree centigrade bath for almost 18 to 24 hours.

04:47 Okay.

04:48 Then what will happen? 100 % alpha ferrite can be achieved.

04:57 Alpha ferrite can be achieved in this case.

05:07 Okay...

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