| The Effect of "Repetitive Corrugation and Straightening by Rolling" (RCSR) Process above Md30 temperature on the Microstructure of 304 stainless steel |
| Paper ID : 1654-UFGNSM-FULL |
| Authors: |
|
Shima Ahmadzadeh salout *1, M. Nili2, Hassan Shirazi2 1University of Tehran 2School of Metallurgy and Materials Engineering, University of Tehran |
| Abstract: |
| The current research is an attempt to study the effect of a novel severe plastic deformation technique called "repetitive corrugation and straightening by rolling" (RCSR) and subsequent annealing on the microstructure and mechanical properties of AISI type 304 austenitic stainless steel. In this study, RCSR process was carried out at 200 °C on the 304 austenitic stainless steel (above Md30 temperature that is about 50 °C for this stainless steel) in order to avoid the formation of martensite phase when a high density of dislocations was introduced into the austenite phase and also high density of mechanical twins was induced in the deformed 304 austenitic stainless steel because of relationship between deformation temperature, stacking fault energy (SFE) and mechanisms of deformation. Thereafter, annealing treatment was applied into deformed samples in order to refine the microstructure of 304 stainless steel. In order to determine the beginning and the end of recrystallization temperature of deformed samples, dilatometer tests were used. The specimens were examined by optical microscopy (OM), tensile and micro-hardness tests. The results indicate that by increasing the cycles of RCSR process (increasing applied strain), more mechanical twins are induced, the hardness and in particular, the yield stress of specimens have been increased. |
| Keywords: |
| 304 stainless steel, severe plastic deformation, RCSR. |
| Status : Paper Accepted (Poster Presentation) |
