scholarly journals Characterization of Ni-Cr-Mo alloy phase structures under DLD process

2021 ◽  
Vol 2077 (1) ◽  
pp. 012015
Author(s):  
R M Rashkovets ◽  
A A Nikulina ◽  
O G Klimova-Korsmik ◽  
A I Smirnov ◽  
S V Veselov ◽  
...  
Keyword(s):  
Laser Power ◽  
Xrd Analysis ◽  
Temperature Gradients ◽  
Laser Deposition ◽  
Operating Parameters ◽  
Structure Transformation ◽  
Phase Structures ◽  
Direct Laser ◽  
Δ Phase

Abstract Direct laser deposition of Ni-Cr-Mo alloy has been carried out to study the phase structure transformation under various operating parameters. To assess the phase composition SEM, TEM and XRD analysis were performed. It clearly seen that the precipitation of straightening phases (γ' and γ") depends on the temperature gradients caused by different laser power. The nucleation of γ' phase starts at 750 W while γ" phase at 1000 W. The changes in temperature gradients lead to different diffusion condition across all the stage of laser power variation and formation of δ-phase, primary MC carbides and Laves phase. δ-phase of all samples did not change the shape and characterized only by plate-like shape.

Effect of Powder Fraction 09CrNi2MoCu on the Structure and Properties of the Obtained Samples Using the Direct Laser Deposition

2020 ◽  
Vol 299 ◽  
pp. 571-576
Author(s):  
R.V. Mendagaliev ◽  
R.S. Korsmik ◽  
O.G. Klimova-Korsmik ◽  
S.A. Shalnova
Keyword(s):  
Comparative Analysis ◽  
Laser Power ◽  
Fractional Composition ◽  
Laser Deposition ◽  
Structure And Properties ◽  
Direct Laser Deposition ◽  
Direct Laser ◽  
Powder Particles ◽  
Impact Bending ◽  
Powder Fraction

One of the disadvantages of using steel powders is the difficulty of producing such materials. In this article, steel powders from various manufacturers were discussed. The analysis of the surface, powder particles and the distribution of the fractional composition and the possibility of reuse was carried out. Direct laser deposition modes, using different laser power, were designed. From the obtained modes, tensile and impact bending samples were grown, and a comparative analysis of the obtained results was carried out.

Direct laser deposition of Ti-6Al-4V from elemental powder blends

2016 ◽  
Vol 22 (5) ◽  
pp. 810-816 ◽  
Author(s):  
Lei Yan ◽  
Xueyang Chen ◽  
Wei Li ◽  
Joseph Newkirk ◽  
Frank Liou
Keyword(s):  
Vickers Hardness ◽  
Laser Power ◽  
Laser Deposition ◽  
Elemental Powder ◽  
Content Type ◽  
Weight Percentage ◽  
Direct Laser Deposition ◽  
Direct Laser ◽  
Powder Blends ◽  
Percentage Ratio

Purpose This paper aims to achieve Ti-6Al-4V from Ti, Al and V elemental powder blends using direct laser deposition (DLD) and to understand the effects of laser transverse speed and laser power on the initial fabrication of deposit’s microstructure and Vickers hardness. Design/methodology/approach Two sets of powder blends with different weight percentage ratio for three elemental powder were used during DLD process. Five experiments with different processing parameters were performed to evaluate how microstructure and Vickers hardness change with laser power and laser transverse speed. Energy dispersive X-ray spectroscopy, optical microscopy and Vickers hardness test were used to analyze deposits’ properties. Findings This paper reveals that significant variance of elemental powder’s size and density would cause lack of weight percentage of certain elements in final part and using multiple coaxial powder nozzles design would be a solution. Also, higher laser power or slower laser transverse speed tend to benefit the formation of finer microstructures and increase Vickers hardness. Originality/value This paper demonstrates a new method to fabricate Ti-6Al-4V and gives out a possible weight percentage ratio 87:7:6 for Ti:Al:V at powder blends during DLD process. The relationship between microstructure and Vickers hardness with laser power and laser transverse speed would provide valuable reference for people working on tailoring material properties using elemental powder method.

Preparation and characterization of CuSbSe2 thin films deposited by pulsed laser deposition

2021 ◽  
Vol 127 ◽  
pp. 105716
Author(s):  
Tianzhen Guo ◽  
Dan Wang ◽  
Yajun Yang ◽  
Xiaoyong Xiong ◽  
Kelin Li ◽  
...  
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Laser Deposition

Processing by Pulsed Laser Deposition and Structural, Morphological and Chemical Characterization of Bi-Pb-Sr-Ca-Cu-O and Bi-Pb-Sb-Sr-Ca-Cu-O Thin Films

2010 ◽  
Vol 75 ◽  
pp. 202-207
Author(s):  
Victor Ríos ◽  
Elvia Díaz-Valdés ◽  
Jorge Ricardo Aguilar ◽  
T.G. Kryshtab ◽  
Ciro Falcony
Keyword(s):  
Thin Films ◽  
Pulsed Laser Deposition ◽  
Room Temperature ◽  
Pulsed Laser ◽  
Chemical Characterization ◽  
Laser Deposition ◽  
Nominal Composition ◽  
Deposition Parameters ◽  
The Relationship

Bi-Pb-Sr-Ca-Cu-O (BPSCCO) and Bi-Pb-Sb-Sr-Ca-Cu-O (BPSSCCO) thin films were grown on MgO single crystal substrates by pulsed laser deposition. The deposition was carried out at room temperature during 90 minutes. A Nd:YAG excimer laser ( = 355 nm) with a 2 J/pulse energy density operated at 30 Hz was used. The distance between the target and substrate was kept constant at 4,5 cm. Nominal composition of the targets was Bi1,6Pb0,4Sr2Ca2Cu3O and Bi1,6Pb0,4Sb0,1Sr2Ca2Cu3OSuperconducting targets were prepared following a state solid reaction. As-grown films were annealed at different conditions. As-grown and annealed films were characterized by XRD, FTIR, and SEM. The films were prepared applying an experimental design. The relationship among deposition parameters and their effect on the formation of superconducting Bi-system crystalline phases was studied.

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