Continuous dynamic recrystallization of AISI 430 ferritic stainless steel

Abstract

The high-temperature deformation behavior of AISI 430 ferritic stainless steel was studied by torsion tests. The deformation tests were performed in the temperature range of 900-1100 o C and strain rate range of 5.0×10 . In addition, when heavy deformation (>300%) was applied, higher misorientation (~15 o ) was achieved. The tendency of CDRX increased with increasing strain rate and decreasing temperature. The dependence of CDRX grain size on the strain rate and temperature was discussed.

Microstructural characterizations of 14Cr ODS ferritic steels subjected to hot torsion

“…Compared to a standard ferritic stainless steel (AISI 430 material) deformed in the same conditions, these values are much higher. The observed ductility, however, is lower [16].…”

Restoration Processes during Hot Deformation in the δ-ferrite and Austenite Dual Phase Region of AISI430 Ferritic Stainless Steel

“…In comparison with other studies that described continuous ferrite restoration mecha-nisms, 6,28) . 31) Despite a change in restoration mechanism being reported (Sec.…”

“…However not all of the literature referenced the dual phase microstructure. For example, experiments by Kim et al 6) used laboratorycast steel, where the absence of nitrogen from the composition restricted the amount of g phase.…”

“…At lower, more normal laboratory strain rates, 0.16 s Ϫ1 compared to the industrial strain rate of 16 s Ϫ1 the evidence suggests that more continuous restoration mechanisms were acting during the deformation itself. A recent study by Kim et al 6) reported that continuous dynamic recrystallisation in AISI430 was prominent between 900 and 1 100°C. A heavy deformation (Ͼ300 %) was applied under torsional strain rates of up to 5 s…”

“…The literature reports three dynamic mechanisms during hot working, from recovery and recrystallisation to continuous dynamic recrystallisation. 2,4,[6][7][8][9] The static restoration mechanisms are also unclear, with the driving force considered to be the remaining stored energy after hot working.…”