I have following conditions of experiment:
-low carbon steel after tmcp
(S460М - %0,15 С; 0,23 Si; 1,3 Мn; 0,09 Сr; 0,019 Ni; 0,01 V; 0,05 Nb; 0,025 Al; 0,013 S та 0,017 Р.)
-heat treatment: heating up to 950 deg of Celsium, 1 hour exposure and cooling together with furnace. (in fact it is annealing at 950deg)
After this it is observed significant increase in grain size and decrease of mechanical properties.
(if I use in experiment low carbon steel obtained via normalization the effect of grain grows is less explisit)
What could be reasons of such intense grain grows in tmcp steel?
Probably you have any reference on literature, where this effect can be described?
Beforehand thank you!!
What do you mean by grain growth in here? What are initial grain sizes of tmcp and normalized and what are grain sizes after annealing?
Dear Grzegorz Cios, thank you for your kind respond!
Here on attached images represented only tmcp steel before and after heating.
Grain size before - 15mkm and after heating - up to 50 mkm.
I guess for normalized steel average grain size is larger and after annealing not changes too much?
tmcp steel is specially processed to obtain smaller grains, during annealing you simply normalize it so after process you get larger grains.
For comparison what grain sizes you obtain for normalized steel?
Grzegorz Cios yes you are right, for normalized steel grain size near 20 mkm and after heat treatment not exceed 30mkm (i attach images)
".. after process you get larger grains " - could you specify the mechanism of this, please?
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