Abstract
Hot compression experiments have been performed to study the influence of molybdenum and nitrogen on the kinetics of static recrystallization in four austenitic stainless steels: AISI 316L (17Cr–13Ni–2·5Mo), AISI 316LN (17Cr–13Ni–2·5Mo–0·17N), DIN Wnr.l·4439(18Cr–12Ni–4·4Mo–0·2N), and UHB 904L(20Cr–25Ni–4·5Mo–1·5Cu). Experiments were carried out both for wrought and cast materials at temperatures of 1050–1250°C and to strains between ε = 0·10 and ε = 0·40. It was found that the static recrystallization was delayed by a factor of about 1·7 in time when raising the molybdenum content from 2·5 to 4·5 wt-%. Nitrogen was found to have no significant effect on the rate of static recrystallization. Cast material recrystallized more slowly than wrought material and this could not be attributed only to a grain size effect. Increasing strain and temperature resulted in a reduced recrystallization time. The recrystallized grain size decreased with increasing strain and decreasing temperature. Empirical expressions could reproduce with excellent accuracy the strain and temperature dependence of both the fraction recrystallized and the recrystallized grain size.
MST/360
Get full access to this article
View all access options for this article.