Effect of Cold Rolling on Morphology of Carbides and Properties of 7Cr17MoV Stainless Steel

Abstract

The evolution of the carbides and mechanical properties of 7Cr17MoV stainless steel used as cutlery material during cold rolling was investigated in this study. The results demonstrate that the microstructure of the rolled steel is composed of pearlite and spheroidal carbides. After cold rolling, the aggregation of carbides was no longer evident, and the carbides appeared to be small in size and uniformly distributed, whereas carbides in hot-rolled strips are clearly aggregated. Decreasing the thickness of the cold-rolled strips decreased the size of the carbide particles while increasing their number, which improved the particle distribution. A large number of fine, even nano-scaled carbides were observed in the material. The carbide phase, which primarily consisted of M 23 C 6 , did not change during cold rolling and annealing. The tensile strength and yield strength first decreased and then increased, and the elongation increased as the thickness of the cold-rolled strips decreased. Dimples and inclusion particles were readily observed upon tensile fracture. The inclusions are identified to be primarily carbides and oxide inclusions.

Effect of Titanium on the Microstructure and Mechanical Properties of High-Carbon Martensitic Stainless Steel 8Cr13MoV

“…The eutectic carbides were separated. 3. It was found that secondary carbides precipitated along the grain boundaries in these three samples.…”

“…They have been widely used to produce knives and scissors, valves, structural components [1][2][3][4]. The high-carbon martensitic stainless steel 8Cr13MoV is currently used to produce high-grade knives and scissors [4].…”

Role of slag on inclusions control and its effect on primary carbides in H13 steel

“…Though most of the large-size inclusions in the consumable electrode can be removed due to the sufficient reaction between the molten slag and molten steel during ESR process, the remaining and newborn inclusions still post some problems, one of which is that they may promote the precipitation of the primary carbides by acting as the nucleation cores of primary carbides [15]. The primary carbides with large size can also act as the breakage initiation sites in steel and hardly be eliminated by the subsequent heat treatment [16,17].…”

Investigation of Primary Carbides in a Commercial-Sized Electroslag Remelting Ingot of H13 Steel

“…The primary carbide, which is hardly eliminated by regular heat treatment, is considered to have a negative effect on the properties of H13 steel. Not only could the primary carbide decrease the strength, the toughness, and the fatigue performance, but also the primary carbide would act as the initiation site of breakage during the machining process [11][12][13].…”

“…The primary carbide, which is hardly eliminated by regular heat treatment, is considered to have a negative effect on the properties of H13 steel. Not only could the primary carbide decrease the strength, the toughness, and the fatigue performance, but also the primary carbide would act as the initiation site of breakage during the machining process [11][12][13]. Mao et al studied the influence of the cooling rate on the primary carbide and found that a higher cooling rate would contribute to the decrease of size and area of primary carbide [14].…”