Study of the material quality of samples obtained byselective laser melting (slm) method from in718 alloy powder
Processy litʹâ, 2021, Tom 144, №2, p.12-22
DOI:
https://doi.org/10.15407/plit2021.02.012Keywords:
selective laser fusion, heat treatment, mechanical properties, heat-resistant properties, macrostructure, microstructureAbstract
Received 19.02.2021
UDK 669.24.002.8:621.01
It was studied the quality of the material of the samples made of IN718 alloy by the method of selective laser melting (SLM) in different directions from the powder obtained by the centrifugal sputtering method. It was found that the mechanical properties at room temperature (20 0C) of IN718 alloy specimens (both horizontal and vertical) meet the requirements of AMS 5662M. Conducting heat treatment helps to increase and stabilize the mechanical properties. Vertical specimens are characterized by a slight decrease in strength (within the requirements of AMS 5662M) and an increase in plastic properties in comparison with the values of horizontal specimens. In this case, the mechanical properties of specimens from the IN718 alloy (both vertical and horizontal) at 20 0C significantly exceed the properties of the EP718-VD (ID) alloy. Short-term mechanical tests of samples after heat treatment at temperatures of 500, 600, and 700 0C showed that an increase in temperature leads to a decrease in the strength characteristics of the IN718 alloy. The mechanical properties of IN718 alloy specimens (both vertical and horizontal) at 500, 600, and 700 0C exceed the properties of EP718-VD (ID) alloy at the indicated temperatures.The heat-resistant properties of heat-treated samples (both horizontal and vertical) meet the requirements of AMS 5662M. The time to destruction is ~7.8 times higher than the specified requirements. In this case, the values of the long-term strength of horizontal samples are ~1.7 times lower than that of vertical ones. The microstructure of samples fabricated by selective laser melting (SLM), before heat treatment, has a dendritic structure, is a Ni-Fe-Cr γ-solid solution with the presence of carbides and carbonitrides, which is characteristic of the IN718 alloy. In the microstructure of the samples under study (grown both in the XY and Z directions), there is a structural inhomogeneity caused by the formation of grains elongated in the growth direction of the sample, as well as zones of layer-by-layer fusion. Heat treatment contributes to obtaining a more uniform structure due to the equalization of the chemical composition between the zones of layer-by-layer melting. With an increase in the temperature of short-term mechanical tests to 700 0C, some coarsening of the structure occurs due to coagulation of intermetallic phases.
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Copyright (c) 2021 В. В. Клочихін, П. А. Касай; К. Б. Балушок; В. Г. Шило, *В. В. Наумик
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