Elucidating Corrosion Behavior of Hastelloy-X Built Using Laser Directed Energy Deposition-Based Additive Manufacturing in Acidic Environments

2021 ◽  
pp. 347-355
Author(s):  
P. K. Diljith ◽  
A. N. Jinoop ◽  
C. P. Paul ◽  
P. Krishna ◽  
S. Bontha ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Corrosion Behavior ◽  
Energy Deposition ◽  
Hastelloy X ◽  
Directed Energy Deposition ◽  
Acidic Environments ◽  
Directed Energy

Effect of scan pattern on Hastelloy-X wall structures built by laser-directed energy deposition-based additive manufacturing

2021 ◽  
pp. 251659842110363
Author(s):  
A. N. Jinoop ◽  
S. K. Nayak ◽  
S. Yadav ◽  
C. P. Paul ◽  
R. Singh ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Nickel Superalloy ◽  
Grain Structure ◽  
Wall Width ◽  
Hastelloy X ◽  
Directed Energy Deposition ◽  
Wall Structures ◽  
Directed Energy ◽  
Scan Pattern

This article systematically analyzes the effect of scan pattern on the geometry and material properties of wall structures built using laser-directed energy deposition (LDED)-based additive manufacturing. Hastelloy-X (Hast-X), a nickel superalloy, is deposited using an indigenously developed 2-kW fiber laser–based LDED system. The wall structures are built using unidirectional and bidirectional scan patterns with the same LDED process parameters and effect of scan pattern on the geometry, microstructural and mechanical characteristics of Hast-X wall structures built using LDED. The wall width is higher for samples deposited with the bidirectional pattern at the starting and ending points as compared to walls built with the unidirectional pattern. Further, the range of width value is higher for walls built with bidirectional strategy as compared to walls built with unidirectional strategy. Wall height is more uniform with unidirectional deposition at the central region, with the range and standard deviation for walls built using bidirectional deposition at 3 and 2.5 times more than unidirectional deposition, respectively. The deposition rate for bidirectional deposition is two times that of unidirectional deposition. The microstructure of the built walls is cellular/dendritic, with bidirectional deposition showing a finer grain structure. Elemental mapping shows the presence of elemental segregation of Mo, C and Si, confirming the formation of Mo-rich carbides. Micro-hardness and ball indentation studies reveal higher mechanical strength for samples built using the bidirectional pattern, with unidirectional samples showing strength lower than the conventional wrought Hast-X samples (197 HV). This study paves a way to understand the effect of scan pattern on LDED built wall structures for building intricate thin-walled components.

scholarly journals Directed energy deposition additive manufacturing of functionally graded Al-W composites

2021 ◽  
Vol 39 ◽  
pp. 101845
Author(s):  
J.P. Kelly ◽  
J.W. Elmer ◽  
F.J. Ryerson ◽  
J.R.I. Lee ◽  
J.J. Haslam
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Functionally Graded ◽  
Directed Energy Deposition ◽  
Directed Energy

scholarly journals Working distance passive stability in laser directed energy deposition additive manufacturing

2019 ◽  
Vol 161 ◽  
pp. 86-94 ◽  
Author(s):  
James C. Haley ◽  
Baolong Zheng ◽  
Umberto Scipioni Bertoli ◽  
Alexander D. Dupuy ◽  
Julie M. Schoenung ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
Energy Deposition ◽  
Passive Stability ◽  
Directed Energy Deposition ◽  
Directed Energy ◽  
Working Distance
Sign in / Sign up

Export Citation Format

Share Document