4. Conclusions
The strain hardening exponent increases sharply with the increase in interlamellar spacing up to a critical value
(280 nm), above which further increases in the interlamellar spacing result in no substantial increase in the strain
hardening exponent. For the spring steel 60Si2MnA, an empirical correlation between the interlamellar spacing
and strain hardening exponent were determined as n = -0.52·exp(-SP/58.29)+0.32.