The conducted the Temperature survey with TC inside the parts for the furnace. Parts stray at 1650F for 30 minutes. The coarse grains are observed from the surface to about 1/4" into the core.
Hello,
We are seeing abnormal grain growth in 20MnCr5 material after normalizing. We see very fine grains (grain size 7/8) and in the middle of microstructure we see grain size of 3. The large grain has also transformation products inside the grain instead of normal ferrite, pearlite...