Effect of laser power on the microstructure and mechanical properties of heat treated Inconel 718 superalloy by laser solid forming

The as-deposited Inconel 718 (IN718) superalloy was fabricated by laser solid forming (LSF) method under different laser power. The microstructure and mechanical properties of IN718 superalloys were analyzed by optical microscopy (OM), scanning electron microscope (SEM), energy dispersive X-ray spec...

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Bibliographic Details
Published in:Journal of alloys and compounds 2018-05, Vol.746, p.159-167
Main Authors: Zhu, Lin, Xu, Zhoufeng, Gu, Yuefeng
Format: Article
Language:English
Subjects:
Dimpling
Elongation
Forming
Fracture surfaces
Heat treatment
Laser solid forming
Lasers
Laves phase
Mechanical properties
Mechanical property
Microhardness
Microstructure
Molybdenum
Nickel alloys
Nickel base alloys
Nickel based superalloys
Optical microscopy
Optical properties
Superalloys
Transmission electron microscopy
X ray spectrometers
X-ray diffraction
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Description
Summary:The as-deposited Inconel 718 (IN718) superalloy was fabricated by laser solid forming (LSF) method under different laser power. The microstructure and mechanical properties of IN718 superalloys were analyzed by optical microscopy (OM), scanning electron microscope (SEM), energy dispersive X-ray spectrometer (EDS), X-ray diffraction (XRD), electron back scattered diffraction (EBSD) and transmission electron microscopy (TEM) methods after solution and homogenization‒solution‒aging (HSA) treatment. The grains of solution treated IN718 superalloys vary with increasing laser power from 1250 W to 1400 W. The Nb and Mo rich Laves phase is found in the as-deposited IN718 superalloy while being eliminated after heat treatment. Compared with the solution treated specimens, the strength and microhardness of HSA treated IN718 superalloy have been significantly improved while the elongation decreases obviously. The specimen under laser power of 1350 W has better mechanical properties than the others. The fracture surfaces of the broken tensile IN718 superalloys exhibit mostly dimpled surfaces, indicating a transgranular ductile failure mode. •The influence of laser power on the heat treated LSF IN718 superalloy is studied.•Fine grains of IN718 superalloy are respectively obtained.•The microstructure and mechanical properties of heat treated IN718 superalloy are proposed.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2018.02.268