About this Abstract |
| Meeting |
MS&T25: Materials Science & Technology
|
| Symposium
|
Advances in Metallic Coated Advanced Steels
|
| Presentation Title |
Surface-Modified High-Mn Steel via HSLA Multilayer Additive Manufacturing: Robust LMAC Resistance |
| Author(s) |
Du-Rim Eo, Seok-Hyun Hong, Jung-Wook Cho |
| On-Site Speaker (Planned) |
Du-Rim Eo |
| Abstract Scope |
As a novel approach to mitigate liquid metal embrittlement in High-Mn steel, multi-layered steel (MLS) sheets combining austenitic TWIP and HSLA grades were developed. Two variants—C2 with two clad layers and C4 with four—were produced by combining additive manufacturing and roll milling process. Both C2 and C4 consist of an austenitic TWIP core and a tempered-martensitic HSLA cladding, but the HSLA layer is subdivided into two or four sublayers with progressively lower carbon and manganese contents toward the interface with the thickness of 30 and 50 µm only. When subjected to resistance spot welding, LME cracks formed in C2 samples welded for either 240 or 380 ms, whereas C4 samples showed no cracking even at 380 ms. This difference in LME susceptibility arose from the sublayer microstructures beneath the zinc coating after high-temperature welding exposure. The fraction of austenite retained or reverted during cooling was critical. |