I am studying the effects of punching holes in stainless steel and am looking for a way in which to reduce the overall energy required to do so as this could have the effect of reducing stress on the punch. I am looking to see if lowering the temperature to close to the ductile brittle transition will increase punching capability. I am quite experienced in this area but this is unchartered territory for me?!
Both the yield strength and UTS(particularly) of (austenitic 300series) stainless steels increase substantially with decreasing temperature.Ductility decreases but still remains substantial.The relative increases/decreases in these properties are higher in their annealed conditions than in their cold worked conditions.
The impact properties of most 300 series alloys decrease by proportionately smaller amounts than their corresponding tensile properties , even at liquid nitrogen temperatures.
I suspect that for the austenitic grades , at least, using "cold" punching methods will not reduce punch forces .For the ferritic grades,one would have to query whether you could produce crack free holes by such a technique
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