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Microalloyed steel bainite in microstructure

Microalloyed steel bainite in microstructure

Microalloyed steel bainite in microstructure

(OP)
Dear colleagues,

Could you give me any advice about evaluation of microstructure of steel 38MnVS6.

Only ferritic-perlitic structure is acceptable.

If sample 2 microstructure consists from ferrite and perlite (+sorbite?) microstructure of sample 1 consists from ferrite, perlite, bainite (lower?) and martensite. It is my opinion, but I have very small experience in microstructure of this steel...

Please let me know your opinion.

Thank you in advance

RE: Microalloyed steel bainite in microstructure

Your sample #2 microstructure looks like a dual-phase steel consisting of ferrite and fine and coarse pearlite. Your sample #1 has other transformation products besides ferrite and pearlite, and is not a dual-phase steel.

RE: Microalloyed steel bainite in microstructure

I agree with metenger.
The company I work for makes this grade on a fairly regular basis, and sample 1 does appear to have bainite. I wouldn't commit to martensite from a black and white micro-photo, but the wider streaks all running in one direction look suspiciously like it. Especially if they appear gold-ish after a picral etch, which this appears to be.

Out of curiosity, what is the application? I know 38MnVS6 is typically for bolts and the chem is designed so that there is no 'need' for heat-treating after rolling...

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