Prediction and validation of residual stresses generated during laser metal deposition of γ titanium aluminide thin wall structures

2019 ◽  
Vol 6 (10) ◽  
pp. 106550 ◽  
Author(s):  
Mallikarjuna Balichakra ◽  
Srikanth Bontha ◽  
Prasad Krishna ◽  
Vamsi Krishna Balla
Keyword(s):  
Residual Stresses ◽  
Titanium Aluminide ◽  
Metal Deposition ◽  
Thin Wall ◽  
Laser Metal Deposition ◽  
Wall Structures

Laser Metal Deposition of Fe- and Co-Based Shape-Memory Alloys

2021 ◽  
Vol 1161 ◽  
pp. 105-112
Author(s):  
Niklas Sommer ◽  
Gabriel Mienert ◽  
Malte Vollmer ◽  
Christian Lauhoff ◽  
Philipp Krooß ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Microstructural Evolution ◽  
Microstructural Analysis ◽  
Metal Deposition ◽  
Thin Wall ◽  
Laser Metal Deposition ◽  
Wall Structures ◽  
Iron Based ◽  
First Time

In the present study, Iron-based FeMnAlNi and Cobalt-based CoNiGa shape-memory alloys (SMA) were processed by laser metal deposition for the first time. The materials show susceptibility to cracking upon processing when unheated substrates are employed. Pre-heating of the substrate materials eliminated cracking completely and enabled robust deposition of thin-wall structures. Microstructural analysis using optical microscopy revealed different microstructural evolution for the two materials considered.

scholarly journals Ageing response of an Al-Mg-Mn-Sc-Zr alloy processed by laser metal deposition in thin-wall structures

Vacuum ◽  
2018 ◽  
Vol 158 ◽  
pp. 121-125 ◽  
Author(s):  
Tong Zhao ◽  
Wangcan Cai ◽  
Marius Dahmen ◽  
Jonathan Schaible ◽  
Chen Hong ◽  
...  
Keyword(s):  
Metal Deposition ◽  
Thin Wall ◽  
Laser Metal Deposition ◽  
Wall Structures ◽  
Zr Alloy

scholarly journals Effect of Interlayer Cooling Time, Constraint and Tool Path Strategy on Deformation of Large Components Made by Laser Metal Deposition with Wire

2019 ◽  
Vol 9 (23) ◽  
pp. 5115 ◽  
Author(s):  
Yousub Lee ◽  
Yashwanth Bandari ◽  
Peeyush Nandwana ◽  
Brian. T. Gibson ◽  
Brad Richardson ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Residual Stresses ◽  
Material Properties ◽  
Large Scale ◽  
Tool Path ◽  
Metal Deposition ◽  
Cooling Time ◽  
Laser Metal Deposition ◽  
Structural Components ◽  
Part Distortion

Laser metal deposition with wire (LMD-w) is a developing additive manufacturing (AM) technology that has a high deposition material rate and efficiency and is suitable for fabrication of large aerospace components. However, control of material properties, geometry, and residual stresses is needed before LMD-w technology can be widely adopted for the construction of critical structural components. In this study, we investigated the effect of interlayer cooling time, clamp constraints, and tool path strategy on part distortion and residual stresses in large-scale laser additive manufactured Ti-6Al-4V components using finite element method (FEM). The simulations were validated with the temperature and the distortion measurements obtained from a real LMD-w process. We found that a shorter interlayer cooling time, full clamping constraints on the build plates, and a bidirectional tool path with 180° rotation minimized part distortion and residual stresses and resulted in symmetric stress distribution.

Analysis on surface finish of thin-wall parts by laser metal deposition with annular beam

2019 ◽  
Vol 119 ◽  
pp. 105605 ◽  
Author(s):  
Jinchao Zhang ◽  
Shihong Shi ◽  
Geyan Fu ◽  
Jianjun Shi ◽  
Gangxian Zhu ◽  
...  
Keyword(s):  
Surface Finish ◽  
Metal Deposition ◽  
Thin Wall ◽  
Laser Metal Deposition ◽  
Annular Beam

Additive Manufacturing

2019 ◽  
pp. 165-183 ◽  
Author(s):  
Kamardeen Olajide Abdulrahman ◽  
Esther T. Akinlabi ◽  
Rasheedat M. Mahamood
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Titanium Aluminide ◽  
Three Dimensional ◽  
Physical And Mechanical Properties ◽  
Processing Parameters ◽  
Metal Deposition ◽  
Layer By Layer ◽  
Laser Metal Deposition ◽  
Additive Process

Three-dimensional printing has evolved into an advanced laser additive manufacturing (AM) process with capacity of directly producing parts through CAD model. AM technology parts are fabricated through layer by layer build-up additive process. AM technology cuts down material wastage, reduces buy-to-fly ratio, fabricates complex parts, and repairs damaged old functional components. Titanium aluminide alloys fall under the group of intermetallic compounds known for high temperature applications and display of superior physical and mechanical properties, which made them most sort after in the aeronautic, energy, and automobile industries. Laser metal deposition is an AM process used in the repair and fabrication of solid components but sometimes associated with thermal induced stresses which sometimes led to cracks in deposited parts. This chapter looks at some AM processes with more emphasis on laser metal deposition technique, effect of LMD processing parameters, and preheating of substrate on the physical, microstructural, and mechanical properties of components produced through AM process.

Study on Misalignment of Focus Position in Laser Metal Deposition Shaping Processing

2009 ◽  
Vol 16-19 ◽  
pp. 1218-1222
Author(s):  
Feng Jie Tian ◽  
Wei Jun Liu ◽  
Xiao Feng Shang ◽  
Guang Yang
Keyword(s):  
Laser Beam ◽  
Surface Quality ◽  
Metal Deposition ◽  
Thin Wall ◽  
Focus Position ◽  
Laser Metal Deposition ◽  
Single Track ◽  
Random Direction ◽  
Detecting Method

In order to investigate the effect on manufacturing quality of focus position misalignment between laser beam and powder convergence in laser metal deposition shaping (LMDS) processing, several experiments including single-track monolayer, straight thin-wall and ring thin-wall were made. The measurements and analysis on shape, size and surface quality of the experiment parts were carried out. An omnidirectional detecting method to check the misalignment of focus position was brought forward and tested. The results indicate that the misalignment of focus position directly affects the quality of shaping parts and shows the regularity, the detecting method can easily detect the focus position misalignment on random direction and angle and guide the adjustment on them.

Influence of process strategy on distortion and residual stresses for the powder based laser metal deposition process

2017 ◽  
Vol 48 (12) ◽  
pp. 1304-1313 ◽  
Author(s):  
N. Pirch ◽  
H. Schleifenbaum ◽  
S. Linnenbrink ◽  
A. Gasser ◽  
R. Poprawe ◽  
...  
Keyword(s):  
Residual Stresses ◽  
Deposition Process ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Process Strategy
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