| Title |
Effects of Al-Si Coating Thickness on 22MnB5 in Hot Stamping Wear |
| Authors |
지민기(Min Ki Ji); 손현성(Hyunsung Son); 오진근(Jinkeun Oh); 김성우(Seongwoo Kim); 김경목(Kyungmok Kim); 전태성(Tea-sung Jun) |
| DOI |
https://doi.org/10.3365/KJMM.2020.58.8.573 |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
friction; wear; hot stamping; Al-Si coating; ultra-high strength steel |
| Abstract |
Al-Si coated ultra-high strength steels (UHSS) are widely used in automotive applications because of their high strength-to-weight ratio, corrosion protection and good weldability. The hot stamping (also called hot press forming) process is an effective and suitable technique for producing automotive parts from Al-Si coated UHSS. However, critical issues, such as the transfer of the coating materials and the build-up of these materials on the tool surface, have been encountered. These defects affect tool life and product quality. The wear behaviour of Al-Si coated 22MnB5 and Cr coated SKD11 tool was investigated using a high temperature friction test which mimicked the actual hot stamping environment. Two kinds of Al-Si coated 22MnB5 with ~19.6 (AlSi-A) and ~29.3 (AlSi-B) μm coating thicknesses were used in this study. After the friction test the coated layer of AlSi-A was found to be worn up to the diffusion layer, while for AlSi-B, the coating layer mostly remained after the friction test. Adhesive wear predominantly occurred on the tool surface in both cases, but the wear increased significantly in case of AlSi-B. This suggests that the coating thickness and the associated surface roughness are critical factors affecting wear behaviour.(Received June 9, 2020; Accepted June 25, 2020) |