| About this Abstract |
| Meeting |
MS&T22: Materials Science & Technology
|
| Symposium
|
Advances in Zinc-coated Sheet Steel Processing and Properties
|
| Presentation Title |
Alleviation of Zn-assisted Liquid Metal Embrittlement in Austenitic-TWIP/martensitic-HSLA Steel Multi-layered Sheet Additively Manufactured by Directed Energy Deposition |
| Author(s) |
Seok-Hyun Hong, Du-Rim Eo, Sunghak Lee, Jung-Wook Cho, Sung-Joon Kim |
| On-Site Speaker (Planned) |
Seok-Hyun Hong |
| Abstract Scope |
In resistance spot welding, Zn-coated steel sheets are exposed to high temperature and stress, which may cause the liquid metal embrittlement (LME). TWIP steel has been reported to be susceptible to LME, and austenitic microstructure was often considered to be the cause of vulnerability. However, the explanation for the role of microstructure is still unclear.
In this study, the austenitic-TWIP/martensitic-HSLA steel multi-layered sheets (MLSs) were manufactured. Compositionally graded multi-layers from TWIP to HSLA were deposited on the surface of a TWIP slab (140T) by a powder feed additive manufacturing. This slab was homogenized, hot-rolled, and cold-rolled to fabricate a 1.6 mm-thick MLS with a 30 to 50 μm-thick clad layer depending on the number of depositions. After spot welding, the LME cracks were effectively alleviated in MLSs compared to monolithic TWIP steel sheets. Thus, the effect of the clad layer, or subsurface microstructure, on the severity of LME was investigated. |