Journal ArticleDOI
Laser aided direct metal deposition of Inconel 625 superalloy: Microstructural evolution and thermal stability
TLDR
In this paper, a high power CO2 laser was used to create a molten pool on the Inconel 625 substrate into which an InConel 625 powder stream was delivered to create 3D objects.Abstract:
Direct metal deposition technology is an emerging laser aided manufacturing technology based on a new additive manufacturing principle, which combines laser cladding with rapid prototyping into a solid freeform fabrication process that can be used to manufacture near net shape components from their CAD files. In the present study, direct metal deposition technology was successfully used to fabricate a series of samples of the Ni-based superalloy Inconel 625. A high power CO2 laser was used to create a molten pool on the Inconel 625 substrate into which an Inconel 625 powder stream was delivered to create a 3D object. The structure and properties of the deposits were investigated using optical and scanning electron microscopy, X-ray diffraction and microhardness test. The microstructure has been found to be columnar dendritic in nature, which grew epitaxially from the substrate. The thermal stability of the dendritic morphology was investigated in the temperature range 800–1200 °C. These studies demonstrate that Inconel 625 is an attractive material for laser deposition as all samples produced in this study are free from relevant defects such as cracks, bonding error and porosity.read more
Citations
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Journal ArticleDOI
Additive manufacturing of metallic components – Process, structure and properties
Tarasankar Debroy,Huiliang Wei,J.S. Zuback,T. Mukherjee,John W. Elmer,John O. Milewski,Allison M. Beese,Alexander E. Wilson-Heid,Amitava De,Wei Zhang +9 more
TL;DR: A review of the emerging research on additive manufacturing of metallic materials is provided in this article, which provides a comprehensive overview of the physical processes and the underlying science of metallurgical structure and properties of the deposited parts.
Journal ArticleDOI
Laser additive manufacturing of metallic components: materials, processes and mechanisms
TL;DR: Additive manufacturing implies layer by layer shaping and consolidation of powder feedstock to arbitrary configurations, normally using a computer controlled laser as discussed by the authors, which is based on a novel materials incremental manufacturing philosophy.
Journal ArticleDOI
An overview of Direct Laser Deposition for additive manufacturing; Part II: Mechanical behavior, process parameter optimization and control
TL;DR: In this paper, the authors provide an overview of the mechanical characteristics and behavior of metallic parts fabricated via direct laser deposition (DLD), while also discussing methods to optimize and control the DLD process.
Journal ArticleDOI
Selective laser melting additive manufacturing of Inconel 718 superalloy parts: Densification, microstructure and properties
Qingbo Jia,Dongdong Gu +1 more
TL;DR: In this paper, a comprehensive study of densification behavior, microstructural features, microhardness, wear performance and high-temperature oxidation properties of Inconel 718 parts fabricated by selective laser melting (SLM), a typical additive manufacturing process was established.
Journal ArticleDOI
Functionally graded materials: A review of fabrication and properties
TL;DR: The state of the art in materials selection, fabrication, characterization, analysis and modelling of functionally graded materials is presented with a particular emphasis on identifying fundamental structure-property relationships as discussed by the authors.
References
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Journal ArticleDOI
Single-crystal laser deposition of superalloys: processing-microstructure maps
TL;DR: In this paper, a process called epitaxial laser metal forming (E-LMF) has been developed for single-crystal (SX) repair of cracked or worn parts.
Journal ArticleDOI
Closed loop direct metal deposition : art to part
TL;DR: The methodology used to produce a designed macro- and microstructure is described and the state of the art for closed loop DMD is reviewed.
Journal ArticleDOI
Precipitation of the δ-Ni 3 Nb phase in two nickel base superalloys
TL;DR: In this article, the precipitation of the metastable δ-Ni3Nb phase has been studied in two niobium bearing nickel base superalloys and the morphology and distribution of precipitates have been examined and the crystallographic orientation relationship between the austenite and the δ phases has been determined.
Journal ArticleDOI
Epitaxial laser metal forming: analysis of microstructure formation
TL;DR: In this paper, an epitaxial laser metal forming (E-LMF) is presented as a new cladding technique which combines the advantage of near-net-shape manufacturing with a close control of the solidification microstructure.
Journal ArticleDOI
Microstructure and mechanical properties of Inconel 625 superalloy
TL;DR: In this article, the service-exposed Alloy 625 ammonia cracker tubes showed higher strength and lower ductility compared to the virgin material in the solution annealed state, and the dissolution of the Ni2(Cr,Mo)-phase exhibited significant influence upon yield strength (YS) but negligible effect on ductility.