Reduction of residual stress in porous Ti6Al4V by in situ double scanning during laser additive manufacturing

2021 ◽  
Author(s):  
Yi-wa Luo ◽  
Ming-yong Wang ◽  
Ji-guo Tu ◽  
Yu Jiang ◽  
Shu-qiang Jiao
Keyword(s):  
Residual Stress ◽  
Additive Manufacturing ◽  
Double Scanning ◽  
Laser Additive Manufacturing

In situ strengthening of CrMnFeCoNi high-entropy alloy with Al realized by laser additive manufacturing

2020 ◽  
Vol 847 ◽  
pp. 156563
Author(s):  
Xiaoyu Gao ◽  
Zejiang Yu ◽  
Weihua Hu ◽  
Yi Lu ◽  
Zeyu Zhu ◽  
...  
Keyword(s):  
Additive Manufacturing ◽  
High Entropy Alloy ◽  
Laser Additive Manufacturing ◽  
High Entropy

scholarly journals Influence of Heat Treatments on Microstructure and Mechanical Properties of Ti–26Nb Alloy Elaborated In Situ by Laser Additive Manufacturing with Ti and Nb Mixed Powder

Materials ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 61 ◽  
Author(s):  
Jing Wei ◽  
Hongji Sun ◽  
Dechuang Zhang ◽  
Lunjun Gong ◽  
Jianguo Lin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Additive Manufacturing ◽  
Annealing Temperature ◽  
Annealing Treatment ◽  
High Strength ◽  
Fiber Texture ◽  
Laser Additive Manufacturing ◽  
Mixed Powder ◽  
Microstructure And Mechanical Properties

In the present work, a Ti–26Nb alloy was elaborated in situ by laser additive manufacturing (LAM) with Ti and Nb mixed powders. The alloys were annealed at temperatures ranging from 650 °C to 925 °C, and the effects of the annealing temperature on the microstructure and mechanical properties were investigated. It has been found that the microstructure of the as-deposited alloy obtained in the present conditions is characterized by columnar prior β grains with a relatively strong <001> fiber texture in the build direction. The as-deposited alloy exhibits extremely high strength, and its ultimate tensile strength and yield strength are about 799 MPa and 768 MPa, respectively. The annealing temperature has significant effects on the microstructure and mechanical properties of the alloys. Annealing treatment can promote the dissolution of unmelted Nb particles and eliminate the micro-segregation of Nb at the elliptical-shaped grain boundaries, while increasing the grain size of the alloy. With an increase in annealing temperature, the strength of the alloy decreases but the ductility increases. The alloy annealed at 850 °C exhibits a balance of strength and ductility.

Experimental Study on Residual Stress in Titanium Alloy Laser Additive Manufacturing

2013 ◽  
Vol 431 ◽  
pp. 20-26 ◽  
Author(s):  
You Bin Lai ◽  
Wei Jun Liu ◽  
Ji Bin Zhao ◽  
Yu Hui Zhao ◽  
Fu Yu Wang ◽  
...  
Keyword(s):  
Residual Stress ◽  
Titanium Alloy ◽  
Additive Manufacturing ◽  
Stress Measurement ◽  
Scanning Speed ◽  
Obtuse Angle ◽  
Alloy Sample ◽  
Laser Additive Manufacturing ◽  
Scanning Angle ◽  
Pressure Stress

The residual stress in laser additive manufacturing titanium alloy sample was measured using indentation stress measurement method. The residual stress variation formulas was fitted with the major process parameters such as laser power, scanning speed, the powder feed rate etc.. It was studied that the influence of processing layers and scanning corner on the specimen residual stress. The results show that the specimen residual stress increases first and then decreases with the increase of processing layers, and the maximum appears in the fiftieth layer, in addition, the residual stress in the side of corner sample is mainly pressure stress, the maximum appearing in the 150°scanning angle, the minimum appearing in the 120°scanning angle. Therefore, it can reduce the overall sample residual stress effectively by an obtuse angle scanning trajectory.

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