WITHDRAWN: Effect of heat treatment on microstructural evolution and properties of cemented carbides (WC-17Co) processed by selective laser sintering

2019 ◽  
pp. 138291
Author(s):  
Joseph Agyapong ◽  
Aleksander Czekanski ◽  
Solomon Boakye–Yiadom
Keyword(s):  
Heat Treatment ◽  
Microstructural Evolution ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Cemented Carbides

Direct Selective Laser Sintering of WC-Co Cemented Carbide by Premixing of Additives

2012 ◽  
Author(s):  
Hideki Kyogoku ◽  
Takeshi Uemori ◽  
Akihiko Ikuta ◽  
Kenichi Yoshikawa ◽  
Hitoshi Ohmori
Keyword(s):  
Selective Laser Melting ◽  
Laser Power ◽  
Smooth Surface ◽  
Laser Scanning ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Cemented Carbides ◽  
Sintering Process ◽  
Laser Melting ◽  
Scan Speed

In this study, the fabrication conditions of WC cemented carbides by direct selective laser melting were investigated. The effects of additives, such as Co, Cu-20%Sn and Cu powders, and laser scanning conditions on laser sintering process were examined to fabricate a sound laser-scanned body of WC cemented carbides. The optimum laser power, scan speed and scan pitch were found out by experiments. It was found that the continuously smooth single-scan track can be obtained at a lower laser power and a higher scan speed by the addition of 30% Cu powder. The smooth surface of the laser-scanned body could be fabricated at a laser power of 9 W, a scan speed of 20 mm/s and a scan pitch of 0.05 mm.

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.

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.

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