Dynamic recrystallization and precipitation in low carbon low alloy steel 26NiCrMoV 14-5

Hot Deformation Behavior of a Nickel-modified AISI 4330 Steel

“…The above findings are in agreement with previous research indicating the occurrence of DRX in Ni-containing steels. 7,12,16,17) In contrast, microscopic observations of deformed sample at 1 473 K and 1 s A further analysis of the curves indicated that at 1 523 K, the peak strain passed from 0.15 to 0.3 as the strain rate was increased from 0.1 s − 1 to 1 s − 1 (Figs. 2(b) and 2(d)).…”

“…Also, the presence of a peak stress observed above 1 423 K, at strain rate of 0.1 s − 1 , is indicative of the occurrence of dynamic recrystallization. 7,12,14,15,19) Figures 3(a), 3(b) and 3(c) show macrostructures for different conditions using Table 2 , also illustrated by reduced stress levels on stress-strain curves in Fig. 5(a) compared to the as-received ones.…”

“…Hence, a better understanding of the mechanisms governing microstructure evolution during open-die forging of these alloys would allow the optimum design of the thermomechanical process, and could help in developing suitable microstructures and minimize or avoid the observed cracking. 1,2,9) It is well known that during hot working, softening mechanisms such as dynamic recovery (DRV) and dynamic recrystallization (DRX), which could have a determining effect on the selection of thermomechanical processing parameters, 7,[12][13][14][15] take place and modify the microstructure. In general, the mechanical behavior and microstructure evolution of materials at high temperatures can be studied using constitutive equations for recrystallization.…”

“…However, such modifications impact the phase compositions and high temperature formability of the alloy that need to be addressed. [6][7][8][9][10][11] Specifically, it has been reported that nickelcontaining steels are sensitive to cracking during the hot forging process. 9,10) Considering that the rotor shaft manufacturing process generally consists in ingot casting followed by open-die forging in multiple steps, it is therefore critical to study the hot forming behavior of these steels.…”

Evolution of Austenite Grain Size in Continuously Cast Slab during Hot‐Core Heavy Reduction Rolling Process Based on Hot Compression Tests

“…Moreover, the growth of dynamic recrystallization grains can be retarded by the addition of microalloying elements such as Ti and Nb. Thus, the precipitation of these microalloying elements also plays a major role in controlling the final microstructure . Up to the present, numerous studies have been carried out to understand the recrystallization mechanism and kinetics in microalloyed steels below 1150 °C.…”