Influence of strain rate and temperature on tensile stress–strain and work hardening behaviour of 9Cr–1Mo ferritic steel

Dynamic strain ageing, deformation, and fracture behavior of modified 9Cr–1Mo steel

“…In case of the conventional 9Cr-1Mo steel plateau was observed in temperature range of DSA [11]. However, the values of n at respective temperatures are lower in the present investigation as compared with those reported by Roy et al [16] and Palaparti et al [11].…”

“…Both conventional [1,[8][9][10][11] as well as the modified 9Cr-1Mo [12][13][14][15][16][17] steel have been reported to exhibit DSA over the temperature range from 225 to 420 1C. However, slight difference has been observed in temperature range of DSA.…”

Observation of serrated flow in APMT™ steel

“…Earlier, ferritic-martensitic steels such as Grade 9 [3][4][5][6][7] and Grade 91 [8][9][10][11][12][13] 9Cr-1Mo steel, P9 and P91 [14,15] and P92 [16] have been reported to exhibit dynamic strain aging (DSA) over the temperature range of 498-693 K. Occurrence of DSA in these steels has been manifested by serrated plastic flow, plateau in yield and tensile strength, negative strain rate sensitivity and ductility minima [8][9][10][11][12]. DSA in the conventional 9Cr-1Mo steel has been attributed to interactions of dislocations with carbon atoms [3][4][5][6], and with nitrogen atoms in the modified 9Cr-1Mo steel [8,9,12].…”

“…Based on the nature of serrations, A-, B-, C-and D-type of serrations have been reported in earlier experiments with ferritic steels [3][4][5][6][7][8][9][10][11][12][13]. Type A serrations exhibit repeated initiation and continuous propagation of deformation bands along the specimen gage length.…”

Approach for J–R curve determination based on sub-size specimens using a triaxiality dependent cohesive zone model on a (ferritic–martensitic) steel

“…The cross head displacement is 0.12 mm/min for all experiments to result in a quasi-static material response. It has been shown in [20] that there is no strain rate dependency for 9Cr-1Mo steel at room temperature. Nevertheless the cohesive zone parameters depend on material, test temperature and strain rate in general.…”