HAZ prediction using FEM

[bernardirafael]

Hello,

I am performing a transient thermal analysis to identify/predict the heat affected zone dimentions. The welding is being performed on a SAE 1020 steel, using the same metal as filler material. After obtaining the welding results they will be compared to experimental ones. I've seen in a thesys that the author took into consideration that the visible HAZ temperature field for a SAE 1020 is between 1495 °C and 1148 °C. It is known that at this temperature a grain coarsened HAZ is obtained.

The question is, is that correct? Is the visible HAZ's temperature field around 1495 °C and 1148 °C? I am asking this question because it is known that the HAZ has four regions, ranging between ~727 °C up to ~1495°C for the given steel (you can check a FeC diagram to evaluate this information if needed).

If that is correct, then my analysis would be giving out good results... otherwise I am gonna have a bad time.

Thank you in advance.

 

[PeterGuba]

hello,
More specification is needed. Visibility on polished surface or etched surface? The author can be right if visibility is considered on polished surface only.
The HAZ on etched surface, under LOM you are closer to truth. But using TEM visible HAZ is probably in temperature field from ~1495 °C to ~200 °C.
Peter

 

[bernardirafael]

Thank you for replying.

The surface was polished and then Nital 5% was used to reveal the HAZ. According to this process, the visible HAZ would be between 1148 °C and 1495 °C (grain coarsened HAZ)?

-Rafael

 

[bernardirafael]

Anyone?

 

[IRstuff]

Seems to me that this question isn't a FEA question, per se, but a metallurgy question, for which we have forum330 and in which I would suggest that you re-post your question.

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