carboin Chrome cracking

Hello,
i am having a problem with springs made from carbon chrome steel
shattering. I think this is caused by a delay in tempering of the
spring after quenching. Can anybody point me towardds some information
on this. I can't recall what the name of this phenomenon is, please
help.
Reply to
toffeeman
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Delayed cracking is a form of hydrogen cracking. You might also want to check for surface defects. Heat treatments giving residual stress that is tensile at the surface would be bad.
Reply to
deu
are you saying a carbon steel that's been chrome plated?
hydrogen embrittlement has to be baked out of the steel, post plating.
Reply to
beavith
The steel contains around 0.83 % Cr and 0.57 % C, it is designated 55Cr3, the problem seems to occur after quenching from around 900 oC, if we don't then temper within 1 hour or so. If we leave for a few hours before tempering then we sometimes get cracking.
Reply to
toffeeman

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