About this Abstract |
Meeting |
MS&T24: Materials Science & Technology
|
Symposium
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Additive Manufacturing of Metals: Microstructure, Properties and Alloy Development
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Presentation Title |
Challenges in the Heat Treatment of Additively Manufactured Precipitation Hardened Martensitic Stainless Steels |
Author(s) |
Todd A. Palmer, James Zuback |
On-Site Speaker (Planned) |
Todd A. Palmer |
Abstract Scope |
To achieve the desired mechanical and corrosion properties in additively manufactured (AM) precipitation hardened (PH) martensitic grade stainless steels, solutionizing and aging heat treatments are required. However, there is little to no uniformity or predictability in how different material heats respond to these heat treatments, resulting in significant uncertainty in the microstructure and corresponding mechanical properties. Many of these phase transformations are driven by variations in nitrogen and oxygen, leading to the formation of carbo-nitride and oxide phases. The role that different alloying elements play in the formation of these minor phases will be critical to developing heat treatment standards for these important alloy systems. Since many of the differences result from small changes in minor alloying elements, such as Mn, Nb, N, and O, current standards for both composition and heat treatment cycles are insufficient and more flexible heat treatment practices designed for each heat should be pursued. |