What can be the possible reasons for change in r-values (Plastic strain ratio) of 17-4 PH stainless steel after heat treatment ?

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Geoffrey Robert Warburton

Any heat treatment carried out on a PH steel is designed to change its mechanical properties and so the strain ratio.

Edward Vojcak

And changes the copper particles/cluster size shape, distribution and activation energy in the 630 matrix.

R. Saxena

Edward Vojcak Thankyou for your answer Sir. Can we relate it with the formation of reverted austenite phase in aged condition ?

Geoffrey Robert Warburton Thankyou for your answer Sir.

You mean retained austenite - and you should not forget about any Delta ferrite.