(Radionuclides. /nitpick)
You can work under vacuum, melting with arc, induction, or electron beam. The first one may involve contaminants from the arc electrodes, the latter two are contactless and only the crucible may source bad stuff.
Iāve got a solution! Gravity-less induction smelting in SPAAAACE!!! No crucibleā¦
The ultimate in hipster steels!
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Yeah, I was into zero G, vacuum smelting before it was 2.33 Kelvin.
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You can levitate the alloys in magnetic field.
What about this?
Compact Levitation Cold Crucible Vacuum Melting Furnace - EQ-FMF-40
EQ-FMF-40 is an Advanced Vacuum Float-Melting System for exploring new generation magnetic alloy and metallic materials with max. loading 20 g sample. The system uses 40KW high frequency induction heater to cause metallic sample to float during melting by magnetic vortex within a special designed water-cold copper crucible placed inside a vacuum sealed quartz tube. Therefore, it can produce extra high purity ferro or magnetic alloy without any contamination.
Homemade version:
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I was making a hipster joke man. āI was into $thing before it was cool.ā
When you live ahead of the curve, with getting your tech knowledge from researchers instead of salesmen, this is annoyingly common to you. 
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Thatās amazingly awesome.
And on the martensite conversion with cryo treating, itās actually pretty common with certain blade steel alloys. Thereāll still be conversion with enough time, but at colder temps, it can actually happen faster and lead to a brittle blade (think certain stainless steels in arctic environments). The toughness issue is usually resolved by re-tempering post cryo-treating to reduce harness and relieve stresses. The big picture is that that retained austenite is going to convert and be stressed (un-tempered), itās just an issue of whenā¦
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