Rolled samples treating for microtensile test
Rolled samples treating for microtensile test
(OP)
Hello everyone,
I have to do a heat treatment (600C and 1000C for 24 hours) of rolled samples (1mm thickness, 40mm length) of austenitic stainless steel and I am not sure if it's ok if I just use argon atmosphere (24h is not very long in my opinion) or it's better if use a glass protection... What do you think?
I have to do a heat treatment (600C and 1000C for 24 hours) of rolled samples (1mm thickness, 40mm length) of austenitic stainless steel and I am not sure if it's ok if I just use argon atmosphere (24h is not very long in my opinion) or it's better if use a glass protection... What do you think?





RE: Rolled samples treating for microtensile test
If you are going to pickle afterward then you are fine.
If there is minimal oxidation (maybe light yellow or straw color) than pickling will not roughen the surfaces much at all.
If you not pickling then you should work in dry hydrogen (and no nitrogen).
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P.E. Metallurgy, Plymouth Tube
RE: Rolled samples treating for microtensile test
RE: Rolled samples treating for microtensile test
Picking is much easier and will not risk damaging the samples.
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P.E. Metallurgy, Plymouth Tube
RE: Rolled samples treating for microtensile test
And what exactly do you mean by picking?
RE: Rolled samples treating for microtensile test
Regarding polishing, usually tension test specimens are polished with dry abrasive cloths, which breaks up and re-embeds the oxide. Metallographic specimens polished for hardness testing use wet abrasives that remove the oxide from the specimen and carry the swarf away (usually down the drain).
Picking is supposed to be pickling.
RE: Rolled samples treating for microtensile test
I presumed that he was doing surface prep prior to anneal.
I don't see any reason that you couldn't just lap them after HT.
Do it wet, low loads, and very flat.
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P.E. Metallurgy, Plymouth Tube
RE: Rolled samples treating for microtensile test
Anyway, for small samples like that, I recommend using quartz to seal the samples with a torch (very easy process). you can vacuum then seal, or vacuum then fill with Ar2. Even there is some oxygen in the quartz tube, after it is consumed, no new source.