Changes in the strain hardening behavior of an fe-c alloy during strain aging
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STAGES OF AGING
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E. T. S T E P H E N S O N
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E. C. O R E N
ONLY a few reports have been published on the effeat of strain aging on the strain hardening of iron and steel. The two most extensive investigations present contradictory evidence on the effect of strain aging on n, the strain-hardening exponent in the e m pirical stress-strain law Cr = K E n
[1]
where a is true stress, e is true strain, and K is f l o w s t r e s s a t e = 1.0. I n t h e f i r s t of t h e s e s t u d i e s 1 it was found that n was constant during the early s t a g e s of a g i n g a n d l a t e r i n c r e a s e d t o a m a x i m u m . The second study 2 found that n decreased markedly d u r i n g t h e e a r l y s t a g e s of a g i n g a n d l a t e r r e m a i n e d nearly constant. Additional information on n can be inferred from c h a n g e s in e u , t h e t r u e s t r a i n a t m a x i m u m l o a d , b e c a u s e it f o l l o w s 3 f r o m E q . [1] t h a t
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