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About this Abstract
Meeting 2023 AWS Professional Program
Symposium 2023 AWS Professional Program
Presentation Title Plenary Talk: Delta Ferrite and Rapidly Solidified Microstructure in Welding and Additive Manufacturing of Martensitic Steels
Author(s) Leijun Li, Thomas Lienert, Zhe Lyu
On-Site Speaker (Planned) Leijun Li
Abstract Scope Solidification and microstructure evolution of martensitic stainless steels for various cooling rates are surveyed. A lower hardness than that of the air cooling is often observed for rapidly solidified samples. Experimental and thermodynamics analysis of cooling rate on segregation and solid-state transformations is conducted. Delta ferrite is found to be retained more significantly for a faster cooling rate. The martensitic start temperature is found to be suppressed to below the room temperature for a faster cooling rate. A possible mechanism for the observed lower hardness of the as-deposit microstructure is proposed. Implications for potential crack-resistant deposits of these air-quenchable steels are discussed.
Proceedings Inclusion? Undecided

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