|
Vol.58, No.8, 573 ~ 583, 2020
|
| Title |
| Effects of Al-Si Coating Thickness on 22MnB5 in Hot Stamping Wear |
| 지민기 Min Ki Ji , 손현성 Hyunsung Son , 오진근 Jinkeun Oh , 김성우 Seongwoo Kim , 김경목 Kyungmok Kim , 전태성 Tea-sung Jun |
|
|
|
| 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) |
|
|
| Key Words |
| friction, wear, hot stamping, Al-Si coating, ultra-high strength steel |
|
|
 |
|
