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Meeting MS&T25: Materials Science & Technology
Symposium Additive Manufacturing: Enhancement and Synergy with Traditional Methods
Presentation Title Epitaxial Solidification and Cracking Behavior of CMSX-4 Welds: Assessing Additive Manufacturing Integrity
Author(s) Min-Chang Shin, Eun-Joon Chun
On-Site Speaker (Planned) Min-Chang Shin
Abstract Scope The CMSX-4 superalloy is widely used in hot-section components such as turbine blades due to its excellent high-temperature mechanical and chemical properties. However, its poor weldability limits its use in additive manufacturing (AM) for both new fabrication and repair. This study quantitatively evaluates the brittle temperature range (BTR) of CMSX-4 using the Varestraint test with real-time thermal imaging of the melt pool to fundamentally assess AM soundness. Three linear and two oscillated gas tungsten arc welds were performed to examine epitaxial growth behavior. The BTR varied significantly (28-434 K), deviating from the conventional mushy zone concept. A strong correlation between epitaxial growth rate and BTR was observed, attributed to dendritic coalescence undercooling. Based on BTR analysis, hot crack-free and fully epitaxial welds were achieved through arc and laser welding. These experimental results were used to numerically investigate single-crystal AM feasibility.

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

Additive Manufacturing Evaporative Casting (AMEC) for Tooling and Nickel Alloys
Additive Manufacturing to Accelerate Forging Operations: Inconel 718 and 316L Stainless Steel
Characterization of Additively Manufactured AF9628 Steel Parts Produced Via Metal Fused Filament Fabrication
Design of Additively Manufactured Preforms for Hot Forging.
Electrodeposition of Nickel for Load Carrying Applications
Epitaxial Solidification and Cracking Behavior of CMSX-4 Welds: Assessing Additive Manufacturing Integrity
Mechanical Properties of Dissimilar Welds Between LPBFed and Wrought 17-4PH Stainless Steels: Role of LPBFed 17-4PH STS Precipitation Characteristics
SolidStir® Additive Manufacturing Using Conventional Machine Tools and Low-Cost Feedstock

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