Flow stress analysis for determining the critical condition of dynamic ferrite transformation in 6Ni–0.1C steel

Dynamic Transformation of an X70 Steel under Plate Rolling Conditions

“…Previous research has shown that dynamic transformation also contributes to the decreasing flow stress levels. 7,[11][12][13][14][15][16][17] …”

Retransformation Behavior of Dynamically Transformed Ferrite during the Simulated Plate Rolling of a Low C and an X70 Nb Steel

“…[1][2][3][4][5][6][7] This has been shown to occur throughout the austenite phase field. 8,9) In earlier publications, the present authors have reported that the amounts of ferrite formed per pass increase with decreasing temperature.…”

Novel thermomechanical processing methods for achieving ultragrain refinement of low-carbon steel without heavy plastic deformation

“…The existence of equiaxed grains indicates the occurrence of DRX of ferrite. [14][15][16][17] The fractions of high-angle boundaries (HABs) in the specimen processed in route-1 and route-2 are 70% and 75% (Figure 3(c)), respectively, revealing highly recrystallized microstructures. Grain size along the compression axis was measured by the linear interception method counting only HABs.…”

“…[14,15] The present authors have confirmed that dynamically transformed ferrite is further deformed, leading to the occurrence of dynamic recrystallization (DRX), which results in further ferrite grain refinement. [16,17] The novelty of this DRX of DT ferrite phenomenon is that the grain size of ferrite experiencing nucleation and some extent of growth prior to DRX could be very small. It has been well established that decreasing initial grain size (prior to DRX) can decrease the required strain for the initiation of DRX and enhance the nucleation rate and grain growth kinetics, i.e.…”