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http://dx.doi.org/10.9725/kts.2022.38.6.241

Effects of Cryogenic Temperature on Wear Behavior of 22MnB5 Under Cold Stamping  

Ji, Min-Ki (Dept. of Mechanical Engineering, Incheon National University)
Noh, Yeonju (Dept. of Mechanical Engineering, Incheon National University)
Kang, Hyun-Hak (Dept. of Mechanical Engineering, Incheon National University)
Jun, Tea-Sung (Dept. of Mechanical Engineering, Incheon National University)
Publication Information
Tribology and Lubricants / v.38, no.6, 2022 , pp. 241-246 More about this Journal
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 20℃ 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 20℃, but abrasive wear is the main mechanism at cryogenic temperature. As the friction test is repeated, sticking gradually increases on the tool surface at 20℃, 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 20℃. The results for nanoindentation near the worn blank surface indicate a difference of 1.3 GPa at 20℃ and 0.8 GPa at cryogenic temperature compared to the existing hardness, indicating increased deformation by friction at 20℃. This occurs because thermally activated energy available to move the dislocation decreases with decreasing temperature.
Keywords
Cold stamping; Cryogenic; Adhesive wear; Abrasive wear;
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Times Cited By KSCI : 2  (Citation Analysis)
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