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Meeting MS&T21: Materials Science & Technology
Symposium Additive Manufacturing: Large-Scale Metal Additive Manufacturing
Presentation Title Towards Understanding Microstructure Evolution during Wire Arc Additive Manufacturing of Maraging 250 Thin-wall Parts
Author(s) Yao Xu, Brajendra Mishra, Sneha Narra
On-Site Speaker (Planned) Yao Xu
Abstract Scope Wire arc additive manufacturing has recently garnered interest due to near-net-shaped manufacturing of large-scale components. It has higher deposition rates and lower feedstock costs than powder bed fusion (PBF) processes. At the same time, the temperature build-up during layer-by-layer fabrication is higher compared to the PBF processes. Hence, it is critical to assess the impact of thermal cycles and heat accumulation on microstructure and properties. In this work, microstructure characterization of Maraging Steel 250 thin-wall parts was performed to explain the decrease in hardness with wall height. Major observations focus on wall height-dependent prior austenite grain size, tempered martensite and retained austenite phases, and precipitates. Also, the thermal history of each layer was estimated using a conduction-based heat transfer model to explain the observed microstructure. This work establishes a comprehensive understanding of the effect of thermal cycles and heat accumulation on the as-fabricated microstructure of Maraging Steel 250 parts.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Machine Learning-based Geometric Compensation Method for Metal Additive Manufacturing
A Proposed Sustainable Framework to Assess Wire Arc Additive Manufacturing Efficiency in Processing of Different Mechanical Components
An Investigation of the Properties of Stamping Tool Inserts Manufactured Using a Novel Wire Deposition Additive Manufacturing Process
Effect of Inhomogeneous Grain Size on the Deformation Characteristics of Bimetallic Additively Manufactured Structure (BAMS) of 316L Austenitic Stainless Steel and Inconel 625
High Deposition Rate Wire Arc Directed Energy Deposition of 316L for Pressure Retaining Components in Nuclear Applications
Hybrid Metal Manufacturing of Large Freeform Geometries
Manufacturing Large Scale Metal Parts via AM – Current and Future Directions
Microstructure Modification of GMAW-DED 316L Stainless Steel
Moving Heat Source Process Simulation for Wire Arc Additive Manufacturing via a Mesh-free Method and GPU Computing
Novel Thermal Management Technique for Additive Manufacturing
Now On-Demand Only - Development of 3D Metal Printing for Toolmaking
Process Development for Laser Hot Wire Additive Manufacturing of Ti-6Al-4V
Thermo-mechanical FEM Modeling and Machine Learning of Distortion on Overhang Structure in Laser Powder Bed Fusion Additive Manufacturing
Towards Understanding Microstructure Evolution during Wire Arc Additive Manufacturing of Maraging 250 Thin-wall Parts
Wire Arc Processing of Stainless Steels; Microstructure and Properties
Wire + Arc Additive Manufacturing (WAAM) of Al0.1CoCrFeNi High-Entropy Alloy (HEA)

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