극저온이 22MnB5강의 냉간 스탬핑 마모에 미치는 영향
Effects of Cryogenic Temperature on Wear Behavior of 22MnB5 Under Cold Stamping
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This paper presents the effects of cryogenic temperature on the wear behavior of 22MnB5 blank under cold stamping. After immersing the blank in liquid nitrogen (LN2) for 10 min, a strip drawing test was performed within 10 s. The hardness was measured using the Rockwell hardness test, which increased from 165 HV at 20oC to 192 HV at cryogenic temperature. The strip drawing test with 22MnB5 blank and SKD61 tool steel shows that for the different wear mechanisms on the tool surface with respect to temperature; adhesive wear is dominant at 20oC, but abrasive wear is the main mechanism at cryogenic temperature. As the friction test is repeated, sticking gradually increases on the tool surface at 20oC, whereas the scratch increases at cryogenic temperature. For the friction behavior, the friction coefficient rapidly increases when adhesive wear occurs, and it occurs more frequently at 20oC. The results for nanoindentation near the worn blank surface indicate a difference of 1.3 GPa at 20oC and 0.8 GPa at cryogenic temperature compared to the existing hardness, indicating increased deformation by friction at 20oC. This occurs because thermally activated energy available to move the dislocation decreases with decreasing temperature.
Abstract
This paper presents the effects of cryogenic temperature on the wear behavior of 22MnB5 blank under cold stamping. After immersing the blank in liquid nitrogen (LN2) for 10 min, a strip drawing test was performed within 10 s. The hardness was measured using the Rockwell hardness test, which increased from 165 HV at 20oC to 192 HV at cryogenic temperature. The strip drawing test with 22MnB5 blank and SKD61 tool steel shows that for the different wear mechanisms on the tool surface with respect to temperature; adhesive wear is dominant at 20oC, but abrasive wear is the main mechanism at cryogenic temperature. As the friction test is repeated, sticking gradually increases on the tool surface at 20oC, whereas the scratch increases at cryogenic temperature. For the friction behavior, the friction coefficient rapidly increases when adhesive wear occurs, and it occurs more frequently at 20oC. The results for nanoindentation near the worn blank surface indicate a difference of 1.3 GPa at 20oC and 0.8 GPa at cryogenic temperature compared to the existing hardness, indicating increased deformation by friction at 20oC. This occurs because thermally activated energy available to move the dislocation decreases with decreasing temperature.
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