For full-size 10 x 10mm specimens, the relation between Charpy impact energy and Charpy lateral expansion is shown in Fig.1. for duplex and super duplex  and austenitic stainless steel .
Up to a Charpy impact energy of 100J, the corresponding lateral expansion can be approximated by:
LE(mm) = Charpy energy (J)/100
For higher Charpy energies, a fit to the data is given in Fig.1.
- C S Wiesner, 'Toughness requirements for duplex and super duplex stainless steels'. Duplex Stainless Steels '97. Proceedings of the 5th World Conference. Maastricht, The Netherlands, 21-23 October 1997. Book 2, p.979-990. Zutphen, KCI Publishing, 1997.
- J Honeycombe, J A Barlow and T G Gooch: 'Welding austenitic steel and high completion rate processes: submerged arc welding'. TWI Research Report 155/1981, August 1981 (only available to TWI Industrial Members).