About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
|
Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
|
Presentation Title |
Functionally Graded Lightweight Steel Designed by Additive Manufacturing with High Strength and Corrosion Resistance |
Author(s) |
Jeong-Hun Kim, Joonoh Moon, Heung Nam Han, Siwhan Lee, Seong-Jun Park |
On-Site Speaker (Planned) |
Jeong-Hun Kim |
Abstract Scope |
Low-density lightweight steels, particularly Fe-Mn-Al-C based steels, have an excellent balance of high strength and ductility due to their optimum microstructures of ductile matrix and κ-carbide as a strengthener. However, an excessive addition of Al and C can cause microstructural inhomogeneity such as coarse intergranular κ-carbide or ferrite in austenite matrix, reducing corrosion resistance.
To overcome this, we designed a functionally graded lightweight alloy via enhancing the corrosion resistance of surface layer through 3D printing. The austenitic lightweight steel was selected as a base alloy, with 316L stainless steel surface layers built up via 3D printing. An aging treatment after 3D printing strengthened the matrix by κ-carbide precipitation, while the surface layer had excellent corrosion resistance. Interestingly, the interface between base alloy and surface layer shows different microstructure and mechanical properties compared to base alloy and surface layer, resulted from interdiffustion of alloying elements. |