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About this Abstract
Meeting 11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
Symposium 11th Conference on Trends in Welding Research + Additive Manufacturing (TWR+AM)
Presentation Title Extended CCT Diagram for Rapid Microstructure Formation in L-DED of 420 Stainless and Grade 91 Steels
Author(s) Zhe Lyu, Thomas Lienert, Leijun Li
On-Site Speaker (Planned) Leijun Li
Abstract Scope Low-carbon steels solidify as primary delta-ferrite, which, through a peritectic-eutectic reaction, transforms into gamma-austenite, which further transforms to lower-temperature alpha-ferrite and/or martensite. In Laser-Directed Energy Deposition (L-DED) of Grade 91 and Type 420 steels, the delta-ferrite transformation into gamma-austenite was found incomplete. An extended Scheil-type calculation was conducted to understand the kinetics of delta-ferrite decomposition. The final phase fractions were found to be dependent on the delta-to-gamma transformation kinetics that are dictated by the cooling rates for transformations. The model results were used to develop a novel revision to the continuous cooling transformation (CCT) diagram for Grade 91 that captures the kinetics of the delta-to-gamma phase transformation. The broader implications toward rationalizing the microstructures and properties for AM will be discussed.
Proceedings Inclusion? Undecided

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