The Study of the Ageing Impact on Workability and Hardness of the Samples Made of Alloy VV751P (Ni-15Co-10Cr) after Selective Laser Sintering

2017 ◽  
Vol 746 ◽  
pp. 192-197 ◽  
Author(s):  
Andrey V. Balaykin ◽  
Ekaterina A. Nosova ◽  
Natalia V. Galkina
Keyword(s):  
Heat Treatment ◽  
Ambient Temperature ◽  
Metal Powder ◽  
Experimental Research ◽  
Work Ability ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Heat Resistant ◽  
Work Ability Assessment ◽  
Alloy Heat

Work is focused on study of workability changing of heat resistant nickel-based Ni-15Co-10Cr alloy produced by selective laser sintering from metal powder. Experimental research of HRC hardness changing was provided on plate samples 2х10х30 mm after sintering and typical heat treatment for this alloy. Heat treatment was: annealing at temperature of 1,000oС during 1.5 hours, and then at the temperature of 1,180oC for 2.5 h – 3 h. After that samples were treated in a furnace for 50 – 60 minutes at the temperature of 1,050oС. Then they were cooled-off to the temperature of 1,000oС during 50 – 60 minutes. After that they were further quenched at ambient temperature. After quenching the samples were subjected to ageing at the temperature of 850oC during 3, 6, 9, 12 and 15 hours. The bending and measurement of triangle height was proposed for work ability assessment of samples. Increased hardness was found with duration of ageing. Work ability grew up with duration of ageing but where was a gap of workability for 9 hours ageing. Calibration of sintered parts and samples are recommended to perform after quenching and ageing at 850oC no longer 6 hours.

scholarly journals ДОСЛІДЖЕННЯ МЕХАНІЧНИХ ВЛАСТИВОСТЕЙ ТА СТРУКТУРИ СПЛАВУ IN718, ОТРИМАНОГО МЕТОДОМ 3D-ПРИНТИНГУ

2020 ◽  
pp. 21-29
Author(s):  
Никита Олегович Коваль ◽  
Оксана Сергеевна Воденникова
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
3D Printing ◽  
Structural Characteristics ◽  
Selective Laser Sintering ◽  
Vertical Direction ◽  
Laser Sintering ◽  
Heat Resistant ◽  
Before And After ◽  
Treatment Research

The subject of research – the process of structure formation and improvement of mechanical properties of high-resistant alloys obtained by 3D-printing. The purpose of work – control the level of mechanical properties of high-resistant alloys obtained by 3D-printing for the manufacture of parts of aircraft gas turbine engines. Objectives – experimental determination of mechanical properties of heat-resistant nickel alloy IN718 obtained by selective laser sintering of LPW and Sino Euro powders both in the horizontal XY and in the vertical Z direction; a comparative analysis of the mechanical properties of IN718 and ЭП718-ВД(ИД) (ХН45МВТЮБР) alloys according to ASM 5662M and TU 14-1-3905-85; a study of the structure of samples of IN718 alloy before and after heat treatment. Research methods – when summarizing and analyzing scientific and technical literature in the direction of studying mechanical properties and forming the structure of heat-resistant nickel alloys obtained by the method of selective laser sintering, an integrated approach was used; processing and analysis of experimental data on determining the mechanical properties of the IN718 alloy in the three-dimensional direction (horizontal direction XY and vertical direction Z); metallographic studies of samples of the IN718 alloy made by 3D-printing were carried out before and after heat treatment. The results obtained - by comparing the mechanical properties of the heat-resistant alloy IN718 obtained by 3D printing from powders LPW and Sino Euro with the normative characteristics ASM 5662M (for alloy IN718) and TU 14-1-3905-85 (for alloy ЭП718-ВД) it was found that for vertical samples (grown in the Z direction) a certain decrease in the strength characteristics and an increase in plastic characteristics compared with the values of horizontal samples (grown in the XY direction), and in terms of impact strength, the IN718 alloy exceeds the norm in the researched temperature range 3.75 times. Scientific novelty – the dependence of the structural characteristics and mechanical properties of the IN718 alloy on the direction of part growth has been established and it has been shown that after heat treatment it is possible to obtain a dense, uniform microstructure characterized by a fine-grained structure with micro grains that are elongated in the direction of sample growth.

Three-Dimensional Modeling of Selective Laser Sintering of Two-Component Metal Powder Layers

2005 ◽  
Vol 128 (1) ◽  
pp. 299-306 ◽  
Author(s):  
Tiebing Chen ◽  
Yuwen Zhang
Keyword(s):  
Metal Powder ◽  
Continuous Wave ◽  
Selective Laser Sintering ◽  
Three Dimensional ◽  
Laser Sintering ◽  
Powder Layer ◽  
Metal Powders ◽  
Gaussian Laser Beam ◽  
Scanning Velocity ◽  
Three Dimensional Modeling

Laser sintering of a metal powder mixture that contains two kinds of metal powders with significantly different melting points under a moving Gaussian laser beam is investigated numerically. The continuous-wave laser-induced melting accompanied by shrinkage and resolidification of the metal powder layer are modeled using a temperature-transforming model. The liquid flow of the melted low-melting-point metal driven by capillary and gravity forces is also included in the physical model. The numerical results are validated by experimental results, and a detailed parametric study is performed. The effects of the moving heat source intensity, the scanning velocity, and the thickness of the powder layer on the sintering depth, the configuration of the heat affected zone, and the temperature distribution are discussed.

Particularly Selective Sintering of Metal Powders by Pulsed Laser Radiation

2016 ◽  
Vol 685 ◽  
pp. 403-407 ◽  
Author(s):  
V.G. Smelov ◽  
A.V. Sotov ◽  
Serguei P. Murzin
Keyword(s):  
Laser Radiation ◽  
Metal Powder ◽  
Development Process ◽  
Selective Laser Sintering ◽  
Pulsed Laser ◽  
Laser Sintering ◽  
Material Structure ◽  
Metal Powders ◽  
Pulsed Laser Radiation ◽  
Fine Powders

In this article, selective laser sintering of fine metal powder of pure Ni with the size fractions 56 ... 80 microns was conducted. Algorithm development process of laser sintering of fine powders was created, allowing to obtain defect-free samples. Investigation of the material structure of obtained samples was carried out.

Finite Element Simulation of Combined Forming of Selective Laser Sintering and Cold Isostatic Pressing

2010 ◽  
Vol 26-28 ◽  
pp. 60-66
Author(s):  
Yan Ying Du ◽  
Yu Sheng Shi ◽  
Qing Song Wei
Keyword(s):  
Finite Element ◽  
Metal Powder ◽  
Selective Laser Sintering ◽  
Good Method ◽  
Laser Sintering ◽  
Cold Isostatic Pressing ◽  
High Porosity ◽  
Isostatic Pressing ◽  
Metal Parts ◽  
Short Time

Selective Laser Sintering could manufacture high complex metal parts in short time but with high porosity and low strength. The components from Cold Isostatic Pressing have excellent performance with uniform organizational structure, high size precision, and high density. It, however, could not form high complex parts because of the difficulties of bag manufacture. So it will be a good method to combine Selective Laser Sintering and Cold Isostatic Pressing to make complicated metal parts. In this paper, the specimens of stainless steel were made by the combined Selective Laser Sintering and Cold Isostatic Pressing forming route. And the simulation of Cold Isostatic Pressing was carried out by finite element method and Drucker-Prager-Cap constitutive model in ABAQUS/Explicit computer program. The property of metal powder was measured by experiments. The effects of bag on Cold Isostatic Pressing have been discussed. It is different from the Cold Isostatic Pressing of metal powder that the bag has little influence on both shape and size of the specimen. The results of simulation show a good agreement between the experimental results and the calculated results. The simulation can give a useful direction to dimension and shape designs of the combined forming of Selective Laser Sintering and Cold Isostatic Pressing.

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