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1045 Annealed VS Hardened and tempered

1045 Annealed VS Hardened and tempered

1045 Annealed VS Hardened and tempered

(OP)
In one of our applications a 0.188 thick round washer skipped the heat treat process. It is a 1045 annealed, then stamped, then water quenched to acheive 40Rc and tempered. A few samples however were used just in the annealed condition. This washer is used to preload an input pinion bearing in a marine sterndrive and is sandwiched between the bearing inner race and u-joint bearing face. It will see forces in the axial direction.
I was wondering how the annealed washer would behave differently in comparision to the hardened washer? Any thoughts on its deflection/yeilding?

RE: 1045 Annealed VS Hardened and tempered

You probably should post this question on the transmission and driveline forum. A metallurgist, like myself, will tell you that soft is not as good as hard, but the longevity in your application depends on other factors as well.

RE: 1045 Annealed VS Hardened and tempered

The soft can be OK if the stresses are low enough. Can you provide more info on the preload load and the washer area under this preload load. I assume the washer is plated for corrosion protection, if so to my opinion annealed is even better from a hydrogen embrittlement and stress corrosion sensitivity.

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