Steel Microstructure of Medium Carbon Steel
Steel Microstructure of Medium Carbon Steel
(OP)
Dear Metallurgist Master and Enthusiast...
Herewith attached microstructure of 0.45%C after Heat Treatment process. According to the submitters, the process step were:
- Steel Bar
- Hot Forging
- Carburizing
- Tempering
- Case Hardening
- Tempering
We have notice Pearlite and Ferrite microstructure. However, there were some big - irregular shaped pearlite (?) microstructure observed. Do any of metallurgist master here able to identify what is that? On what process does it develop?
Thank your for any comment and advice. Best of Luck.
Regards,
Metalfate
Herewith attached microstructure of 0.45%C after Heat Treatment process. According to the submitters, the process step were:
- Steel Bar
- Hot Forging
- Carburizing
- Tempering
- Case Hardening
- Tempering
We have notice Pearlite and Ferrite microstructure. However, there were some big - irregular shaped pearlite (?) microstructure observed. Do any of metallurgist master here able to identify what is that? On what process does it develop?
Thank your for any comment and advice. Best of Luck.
Regards,
Metalfate





RE: Steel Microstructure of Medium Carbon Steel
Design for RELIABILITY, manufacturability, and maintainability
RE: Steel Microstructure of Medium Carbon Steel
Is this the structure after case hardening and tempering?
Is this the microstructure of the core (or the case)?
Do you know the process times and temperatures of each of the processes?
I am aslo curious about section size. Peralite is a structure generally associated with slow cooling rates. Case Hardening after carburizing is a process that generally involves rapid cooling (quenching). The implication is that, even with quenching, the material represented by the photomicrograph experienced a slow cooling rate from the hardening temperatures. Is that correct?
rp
RE: Steel Microstructure of Medium Carbon Steel
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: Steel Microstructure of Medium Carbon Steel
LOL RP
Mfgenggear
if it can be built it can be calculated.
if it can be calculated it can be built.
RE: Steel Microstructure of Medium Carbon Steel
Using redpicker's guess, the large grains could be discontinuous grain growth from one or more high temperature excursions.
Design for RELIABILITY, manufacturability, and maintainability
RE: Steel Microstructure of Medium Carbon Steel
RE: Steel Microstructure of Medium Carbon Steel
RE: Steel Microstructure of Medium Carbon Steel
Exactly. That is why I forgot (subconsciously discounted) that he said it was carburized and thought he must have meant induction hardened for heat treat which would leave no matensite in the core.
Design for RELIABILITY, manufacturability, and maintainability