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All cryogenic should do is stress relief without softening...
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I've provided sources. This is a good one: thefabricator.com:Cryogenic processing—dispelling the myths, mysteries
Cooling your tooling for improved wear resistance, compressive strength
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Figure 1: The leftmost diagram illustrates a theoretical cubic structure. Two cubic steel structures are body-centered cubic (BCC), also known as ferrite (second from left), and face-centered cubic (FCC), which is austenite (third from left). The face-centered tetragonal (FCT) structure, far right, is known as martensite. The FCT structure is about 14 percent larger than the FCC structure.
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It involves excursions above and below room temperature.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Because much of what is in the published literature is nonsense,
and much of what isn’t nonsense is not in the scientific literature.
-- Sabine Hossenfelder
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