Tailoring Strength and Ductility of a Cr-Containing High Carbon Steel by Cold-Working and Annealing

Abstract

SEM, TEM characterizations, in combination with tensile tests, provided an intriguing observation that ultra-high-strength and good ductility could be achieved simultaneously by changing the ratio of large and small precipitates in high-carbon steel (1.0C-1.5Cr-0.31Mn-0.20Si, wt %). The high yield strength of 670 MPa, tensile-stress of 740 MPa, and good ductility (elongation of 26%) were obtained by adopting spheroidization annealing, cold rolling, recrystallization annealing, and cold drawing. This led to nanosized precipitates with a large ratio of big size to the small size of 0.28, promoting high dislocation storage of 1.39 × 1014 m−2. In addition, the finite element (FE) method was used to simulate the cold-rolling process, and the largest stress and strain were 830 MPa and 0.6 at a depth of 3 mm after the fourth pass of the 0.10C-1.50Cr steel, respectively. The stress and strain accumulation in the top layer was potentially caused by severe plastic deformation, as well as attrition rendered by the rollers. This explained the emergence of dense low-angle grain boundaries in the region close to the surface of the cold rolled steel.

Effect of Microstructure on the Dimensional Stability of Extruded Pure Aluminum

“…The residual plastic strain along the axial direction of the extruded LY12 Al alloy after thermal cycling was about 13 times than that along the transverse direction [15]. The rolled alloy sheet investigated by several scholars demonstrates significant anisotropy in micro-yield, creep deformation and tensile properties due to the strong texture [16][17][18][19]. The strength degradation of commercially pure Al after annealing was the result of the evolution of texture and sub-grain growth during the recovery and recrystallization, which depended on the annealing temperature [20].…”

Behavioural Study of High Carbon Steel Material in Hot and Cold Working Media: A Review

“…Changes in the ratio of big to tiny precipitates in high-carbon steel (1.0C-1.5Cr-0.31Mn-0.20Si, wt%) may be made to concurrently achieve ultra-high strength and excellent ductility, according to SEM, TEM characterisations and tensile testing. Wang et al [12] used spheroidization annealing, cold rolling, recrystallisation annealing, and cold drawing, a high yield strength of 670 MPa, tensile stress of 740 MPa, and excellent ductility (elongation of 26%) was achieved. As a result, 1.39 1014 m2 of high dislocation storage in nanosized precipitates with a huge ratio of big size to the tiny size of 0.28 were produced in Figure 3.…”