Author/Authors :
Saeedipour، S. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran , , Kermanpur، A. نويسنده , , Najafizadeh، A. نويسنده , , Fadavi Amiri، M. نويسنده , , Abbasi، M. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran , , Mazaheri، Y. نويسنده Department of Materials Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran ,
Abstract :
In this study, the effects of nitrogen addition on the production of ultrafine/nano grained AISI 201L stainless
steel by advanced thermo-mechanical process were investigated. Cast samples were first homogenized at 1200 °C
for 4 h, hot-rolled at 1100 °C and finally, solution-annealed at 1150 °C for 2.5 h. Unidirectional and cross multipass
cold rolling at 25 °C was carried out to 90% reduction in thickness, followed by annealing at temperature
and time range of 800–900 °C and 15–1800 s, respectively. The results showed that increasing nitrogen led to the
decrease of delta ferrite content and austenite grain size after solution annealing. It was also found that decreasing
nitrogen content and using cross rolling resulted in an increased volume fraction of the strain induced martensite
(SIM) and reduced saturation strain of martensite formation during cold rolling. Also, the results from the reversion
process revealed that with increasing nitrogen concentration, the formation of thermally induced martensite was
suppressed.
