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Meeting 2021 TMS Annual Meeting & Exhibition
Symposium Continuous Phase Transformations
Presentation Title Study of Precipitation Behavior of High-Cr Ni-based Filler Metals Using In-situ S/TEM
Author(s) Cheng-Han Li, Sriram Vijayan, Carolin Fink, Joerg Jinschek
On-Site Speaker (Planned) Cheng-Han Li
Abstract Scope High-Chromium Nickel-based filler metals are widely used for repair of structural components in nuclear power industry. During multi-pass weld repair applications these alloys are potentially susceptible to ductility-dip cracking (DDC), which is a solid-state grain boundary sliding phenomenon. Precipitation of carbides along grain boundaries upon cyclic heating and cooling is a factor for the occurrence of DDC. Additions of Molybdenum have been shown to enhance the cracking resistance in Ni-30Cr filler metals. However, there is a lack of insight on how Mo effects grain boundary carbide precipitation and results in increased resistance to DDC in multi-pass welds. In situ TEM heating experiments were performed to study preferred carbide nucleation sites and to understand the transformation mechanism of these carbides upon cyclic heat treatment. In situ observations were further validated with DSC and ex situ experiments. Elemental partitioning during precipitation were investigated using XEDS at high spatial-resolution in a probe-corrected S/TEM.
Proceedings Inclusion? Planned:
Keywords Characterization, Nuclear Materials,


Cluster Variation Model of Phase Behavior in Heusler-forming Alloy Systems
Competitive Partitioning and Decomposition Evolution in Nanocrystalline Alloys
Cross-Slip and Work-Hardening in Short-Range Ordered FCC Alloys
Effect of Bulk and Local Phase Transformation on Deformation Mechanisms
Interfacial Spinodals
Intrinsic Phase Stability and Continuous Phase Transformations in TiAlZrN Ultra-hard Nitride Coatings
Magnetically Driven Short-range Order in the CrCoNi System
Microstructural Engineering of Ni-based Superalloys Processed by Conventional and Additive Manufacturing
Phase-field Modelling of Transformation Pathways and Microstructural Evolution in MPEAs (Multi Principle Element Alloys)
Phase Competition in the Two Steps Continuous Phase Transformation during Solidification of Terbium
Short-range Clustering and Ordering Evolution of Ni-22Cr-13Mo Alloy
Structural Transformations Driven by Irradiation in the High Defect Density Limit
Study of Precipitation Behavior of High-Cr Ni-based Filler Metals Using In-situ S/TEM
Thermodynamics of the Invar Transition: Phonons vs. Magnetism

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