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When I worked for the White Motor Company back in the 1960's to the year 1980 we had a machine that took off the cosmoline on the various diesel engine parts. When a cast bell housing was run through the degreaser and not oiled immediately you could actually stand there and see it rust before your eyes.
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I'd call this the sort of anecdotal evidence we wanted to avoid.
The examples you cite could have been two different types of steel (with dramatically different carbon or other contents). That could have had more to do with presence of rust than whether the pieces were cast or forged.
I would not expect a bell housing and a crankshaft, for example, to be made from the same stuff, to withstand physical stress in the same manner, or to resist corrosion in the same way.
Can you cite some technical sources?