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Anonymous Poster #1

Spring Steel Rehardening and Hardening

09/03/2012 10:13 PM

Are there any risk to rehardening spring steel and HSS? How to distinguish them by microscope?
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Sapper
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#1

Re: Spring steel re-hardening and hardening

09/03/2012 11:05 PM

The risk will come from the condition of the items to be heat treated.

If the items have been in service and you are re-heat treating them, any Chips, Cracks, even deep scratches will cause the part fail due to heat stresses.

All of these will be visible under a microscope if not by the naked eye.

There other failure modes such as metal fatigue etc, may not be visible without destructive testing (that I know of).

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Sapper

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Anonymous Poster #1
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Re: Spring steel re-hardening and hardening

09/04/2012 1:09 AM

The production is bimetal bandsaw, backing is D6A and tooth is M42. My customers use rehardening to correct the deformation of the bandsaw. We can use bandsaw machine to test it or use other destructive testing method to see what kind of character has been changed. But i wonder how to find out the change happened with such process?
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bichampsaw
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#3
In reply to #1

Re: Spring steel re-hardening and hardening

09/04/2012 1:29 AM

Thank you. The tool is bimetal bandsaw. The backing is D6A, and the tooth is M42. How can they show the differences in chips and cracks between first hardening and secondary hardening? Is it OK to rehardening the hardend and tempered products ? What is the differences might be in microsstructure by microscope and SEM inspection? Destructive testing were also made, seems the fatigue life is much shorter.
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