About this Abstract |
Meeting |
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Symposium
|
2022 Annual International Solid Freeform Fabrication Symposium (SFF Symp 2022)
|
Presentation Title |
Phase Transformation Dynamics-guided Alloy Design for Additive Manufacturing |
Author(s) |
Qilin Guo, Minglei Qu, Chihpin Andrew Chuang, Lianghua Xiong, Ali Nabaa, Zachary Young, Yang Ren, Peter Kenesei, Fan Zhang, Lianyi Chen |
On-Site Speaker (Planned) |
Qilin Guo |
Abstract Scope |
Fusion-based additive manufacturing technologies enable the fabrication of geometrically and compositionally complex parts unachievable by conventional manufacturing methods. However, the non-uniform and far-from-equilibrium heating/cooling conditions pose a significant challenge to consistently obtaining desirable phases in the as-printed parts. Here we report a martensite stainless steel design guided by phase transformation dynamics revealed by in-situ high-speed high-energy X-ray diffraction. This designed stainless steel consistently forms desired fully-martensitic structure across a wide range of cooling rates (102–107 ℃/s), which enables direct printing of parts with fully-martensitic structure. The as-printed material exhibits a yield strength of 1157 ± 23 MPa, comparable to its wrought counterpart after precipitation-hardening heat-treatment. The as-printed property is attributed to the fully-martensitic structure and the fine precipitates formed during the intrinsic heat treatment in additive manufacturing. The phase transformation dynamics guided alloy design strategy demonstrated here opens the path for developing reliable, high-performance alloys specific for additive manufacturing. |
Proceedings Inclusion? |
Definite: Post-meeting proceedings |