There’s a story in the news right now about someone crashing into seven parked cars at the Dallas Stars parking lot but the part I’m interested in is how this somehow ripped a cybertruck in half?? Like clean in half??
https://bsky.app/profile/ladyemily.nebula.tv/post/3lljueafogc2z
forging/rolling removes voids and creates denser grain. you end up with a better product.
I don’t think that makes much difference for something that gets heat treated (because grain structure & size both change). And there is a whole lot of residual stress that comes with forging/rolling thta may be significant depending on what you’re doing.
The induced stresses are part of what can make forged parts stronger iirc (used to work as a designer with a metallurgist as a colleague but, like, many years ago with an intervening drug addiction, recovery, and uni degree so my memory of the technical details is… Imperfect). But yeah it’s a complex topic.
yes, I believe it is the mechanism behind cold working and peening, but I don’t think it changes the grain structure. Definitely a complex field that I am only barely familiar with.
I’m sure it behaves differently in aluminium vs steel, too.