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Meeting 2018 TMS Annual Meeting & Exhibition
Symposium Atom Probe Tomography for Advanced Characterization of Metals, Minerals and Materials
Presentation Title Investigation of Carbon Redistribution in Martensite during Room Temperature Aging by Correlative TEM and APT
Author(s) Wenjun Lu, Michael Herbig, Christian Liebscher, Lutz Morsdorf, Ross Marceau, Gerhard Dehm, Dierk Raabe
On-Site Speaker (Planned) Wenjun Lu
Abstract Scope For many years, the formation of the transition carbides with carbon (C) contents between 25 and 33.3 at. % in martensite has been controversially discussed. Their rapid formation during cooling makes it difficult to draw clear conclusions about their chemistry and crystallography. Here we investigate the structure and chemistry of carbides that formed in Fe-15Ni-1C (wt.%) martensite after long term aging at room temperature under well-defined experimental conditions. By quenching this alloy in liquid nitrogen, carbon-oversaturated martensite with immobile carbon was formed. The temperature was increased back to room temperature where C had high enough mobility and the alloy was aged for two to three years to investigate the structural and chemical changes that occurred during room temperature aging. A detailed TEM and APT analysis of material in the 2 years aged condition revealed the formation of plate-like, nanoscale precipitates (~1 nm) within the martensitic phase, identified as orthorhombic η-Fe2C.
Proceedings Inclusion? Planned: Supplemental Proceedings volume

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Critical Comparison of APT Characterization of Nanoscale Precipitates in Iron Based Alloys with a Range of Other Techniques
A New Approach to Detect Clusters of Varying Density in Atom Probe Tomography and Its Applications to Oxide-dispersion Strengthened Alloys
Advanced APT Simulations by Combining Electrostatics with Molecular Dynamics
Application of APT in Understanding Thermal Embrittlement of a Duplex Stainless Steel
Applications of APT in Characterization of Magnesium Alloys – A Tool to Develop Heat-Treatable Wrought Magnesium Alloys
APT Studies of Cu-Mn-Ni-Si Precipitate Phase Selection for the Wide Range of RPV Steel Compositions Irradiated in UCSB ATR-1 & ATR-2
Atom-probe Tomography of Materials with Nanometer-Range Characteristic Dimensions
Atom Probe Tomography and Correlative Microscopy of Uranium-10 wt% Molybdenum Alloy Nuclear Fuels
Chemical Imaging of Interfaces and Interphases in Tooth Biominerals
Core/Triple Shell Precipitates in Al-Er-Sc-Zr-(V,Nb,Ta) Alloys
Correlative Transmission EBSD-APT Analysis of Grain Boundaries in Additively Manufactured Nickel-base Superalloy Inconel-738LC
Deformation-induced Mg Redistribution in Al-Mg Alloys Revealed Using Atom Probe Tomography
Direct Observation of Hydrogen in Ti Alloys by Atom Probe Tomography
Effect of Pre-strain on the Solute Clustering, Mechanical Properties, and Work-hardening of a Naturally Aged Al-Cu-Mg Alloy
From Imaging to Quantitative Atom Probe Tomography of Irradiated Microstructures
Grain Boundary Chemistry of Dual Main Phase Nd-Ce-Fe-B As-sintered Magnets Revealed by Atom Probe Tomography
Instrumentation Developments for Emerging Metals and Minerals Applications of Atom Probe Tomography
Investigation of Carbon Redistribution in Martensite during Room Temperature Aging by Correlative TEM and APT
Issues with Atom Probe Quantification of Nitrogen in Steels
Long-range Ordered Nanoscale Domains in an Fe-Co-Mo Maraging Steel, an Atom Probe Microscopy and Neutron Diffraction Study
Modeling Atom Probe Tomography: A Path for Diagnosis and Treatment of Reconstruction Artifacts Symptoms
Multi-dimensional Multi-scale Investigation on Solute Partitioning Behaviours and Redistribution ahead of Solidification Fronts
Nanoscale Phase Separation and Precipitation in AlCoCrFeNi High Entropy Alloys as Studied by Atom Probe Tomography
New Experimental APT Methods for the Analysis of Nanoparticles
Non-diffusive Drag Effect in APT of AlCu Alloy
Partitioning Behavior of Group VB Transition Metals in L12-Strengthened Aluminum Alloys
Perspectives for APT Characterisation of Structural Materials for Nuclear Reactor Applications
Phase Transformations in Titanium Alloys
Secondary Phase and Precipitate Characterization of a Fe25Co25Ni25Al10Ti15 HEA Using Atom Probe Tomography
Segregations at Defects and Interfaces and their Relations to Properties
Spinodal Decomposition and Periodic Segregation in Grain Boundaries on Al Alloy
Studying the Distribution of Trace Elements in Zircon: Deformation and Standards
The Evolution of the Atom-Probe

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