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Originally Posted by Ralph69220d
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I'm sure there are newer methods designed by metallurgists for coatings to make parts less vulnerable to breaking. A process called "magnafluxing" was used on the cranks of alcohol & nitromethane drag engines many years ago. I believe on the crank rod & main journals to the 'left & right' of where the bearing contacted. This was probably protection against tortional breaks more so than bending breaks.
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Magnafluxing is just a process to inspect for cracks. It is not a treatment to make parts less vulnerable to breaking. A steel part is magnetized, then a compass-like instrument is passed over the part's surface. If a crack is present, you will see the field switch from N-S, as magnetic poles are formed at cracks.