Journal ArticleDOI
Effect of molybdenum on the microstructure and wear resistance of cobalt-base Stellite hardfacing alloys
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TLDR
In this paper, the effect of Mo on the microstructures and wear resistance properties of the Stellite 6 hardfacing alloys were investigated using optical microscopy, scanning electron microscopy and electron probe microanalysis and X-ray diffraction.Abstract:
The Stellite 6 hardfacing alloys with different Mo contents have been deposited on AISI 1045-carbon steel using a Plasma Transferred Arc (PTA) welding machine. The effect of Mo on the microstructures and wear resistance properties of the Stellite 6 hardfacing alloys were investigated using optical microscopy, scanning electron microscopy, electron probe microanalysis and X-ray diffraction. With an increase in Mo contents, the M 23 C 6 and M 6 C type carbides were formed instead of Cr-rich M 7 C 3 and M 23 C 6 type carbides observed in the interdenritic region of the Mo-free Stellite 6 hardfacing alloy. The size of Cr-rich carbides in interdendritic region decreased, but that of M 6 C type carbide increased as well as the refinement of Co-rich dendrites. The volume fraction of Cr-rich carbides slightly increased, but that of M 6 C type carbide abruptly increased. This microstructural change was responsible for the improvement of the mechanical properties such as hardness and wear resistance of the Mo-modified Stellite 6 hardfacing alloy.read more
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Journal ArticleDOI
Binder jet 3D printing—Process parameters, materials, properties, modeling, and challenges
Amir Mostafaei,Amy M. Elliott,John E. Barnes,Fangzhou Li,Wenda Tan,Corson L. Cramer,Peeyush Nandwana,Markus Chmielus +7 more
TL;DR: In this paper, a detailed review of the physical processes during 3D printing and the fundamental science of densification after sintering and post-heat treatment steps are provided to understand the microstructural evolution and properties of binder jetted parts.
Journal ArticleDOI
Comparison of Microstructures and Mechanical Properties for Solid and Mesh Cobalt-Base Alloy Prototypes Fabricated by Electron Beam Melting
Sara M. Gaytan,Lawrence E Murr,E. Martinez,J.L. Martinez,B.I. Machado,D. A. Ramirez,Francisco Medina,S. Collins,Ryan B. Wicker +8 more
TL;DR: In this article, the microstructures and mechanical behavior of simple, as-fabricated, solid geometries (with a density of 8.4 g/cm3), including femoral (knee) components and reticulated mesh components, all produced by additive manufacturing (AM) using electron beam melting (EBM) of Co-26Cr-6Mo-0.2C powder are examined and compared.
Patent
Reticulated Mesh Arrays and Dissimilar Array Monoliths by Additive Layered Manufacturing Using Electron and Laser Beam Melting
TL;DR: In this paper, a dry state sonication step for removing metal powder that is not melted from the 3D structure is proposed, where the position where the metal is melted into the structure is formed along a layer of metal powder, wherein the location and intensity of the beam that strikes the metal layer is controlled and directed by a processor.
Journal ArticleDOI
Structural characterization of biomedical Co-Cr-Mo components produced by direct metal laser sintering.
Gianni Barucca,Eleonora Santecchia,G. Majni,E. Girardin,Elena Bassoli,Lucia Denti,Andrea Gatto,Luca Iuliano,Tomasz Moskalewicz,Paolo Mengucci +9 more
TL;DR: For the first time, a homogeneous microstructure comprised of an intricate network of thin ε (hcp)-lamellae distributed inside a γ (fcc) phase was observed, showing a hardness value remarkably higher than those commonly obtained for the same cast or wrought alloys.
Journal ArticleDOI
Laser cladding of Stellite 6 on stainless steel to enhance solid particle erosion and cavitation resistance
TL;DR: In this paper, a laser cladding of Stellite 6 on stainless steel 13Cr-4Ni has been performed to study the performance of clad on solid particle erosion and cavitation erosion at varied energy densities (from 32 to 52 J/mm 2 ).
References
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Book
Properties and selection : nonferrous alloys and special-purpose materials
TL;DR: The ASM Handbook as discussed by the authors provides a comprehensive and authoritative single-volume reference on nonferrous metals and alloys, with particular emphasis on aluminum, titanium, copper, and magnesium.
Journal ArticleDOI
Comparison of the microstructures and abrasive wear properties of stellite hardfacing alloys deposited by arc welding and laser cladding
S. Atamert,H. K. D. H. Bhadeshia +1 more
TL;DR: In this paper, the microstructure of cobalt-based hardfacing alloys deposited by manual metal arc welding, tungsten inert gas (TIG) welding, and laser cladding has been investigated as part of a study attempting to establish the relationship between micro-structure and abrasive wear properties.
Journal ArticleDOI
Wear-Resistant Cobalt-Base Alloys
TL;DR: In this article, it was shown that the adhesive and cavitation-erosion wear characteristics of these alloys are determined by the composition of the matrix alloy and are influenced to a large extent by a strain-induce fee → hep allotropie transformation in the matrix Alloy.
Journal ArticleDOI
The role of stacking fault energy on galling and wear behavior
K.J. Bhansali,A.E. Miller +1 more
TL;DR: In this article, the influence of nickel substitution for cobalt on the galling behavior of a commercial cobalt-base alloy was studied and a metallurgical model was proposed.
Journal ArticleDOI
Microstructure and phase analyses of Stellite 6 plus 6 wt.% Mo alloy
TL;DR: The alloy Stellite-6 was cast with 6% Mo and some pieces of this alloy were cooled in water after annealing at 950°C for 2 h as mentioned in this paper.