MICROSTRUCTURE AND PROPERTIES INVESTIGATIONS OF Fe–Cr–Ni STAINLESS STEEL OBTAINED BY SELECTIVE LASER MELTING

Bogachev, I. A.; Sulyanova, E. A.; Sukhov, D. I.; Mazalov, P.B.

doi:10.18577/2307-6046-2019-0-3-3-13

Cited by 3 publications

(1 citation statement)

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“…На данный момент среди основных задач при реализации 3D-печати металлами является получение материала заготовки с требуемыми физико-механическими свойствами. Кроме того, важно обеспечить приемлемую микроструктуру материала и снизить долю остаточных пор, образование которых связано с качеством исходного материала и параметрами процесса плавки [16][17][18][19].…”

Section: Introductionunclassified

Study of the Effect of Selective Laser Melting Parameters on the Structure and Physico-Mechanical Properties of a Blank Made of Stainless Chromium-Nickel Steel

Khlybov,

Ryabov,

Solovev

et al. 2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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Currently, there are a number of additive technologies that are used in various industries (laser fusion of powder materials, electron beam melting, etc.). The formation of metal structures and products by methods of additive technologies occurs by adding a new layer of material and its further melting (sintering), ensuring the adhesion of each subsequent layer with the previous one in accordance with digital model data. The advantages of using and developing additive technologies include the possibility of using a wide range of materials, obtaining finished products with complex geometries, restoring and repairing damaged structures, as well as the possibility of applying protective and anticorrosive coatings. Metal powder materials with specified physical and mechanical properties are of crucial importance in additive manufacturing. The main requirements for such powders include requirements for their shape and size. The preferred particle shape is spherical, as it provides a more compact installation in a given volume and the necessary fluidity of the material, which is due to the low resistance in the supply systems of powder materials in 3D printers. The aim of the work is to study the influence of the parameters of the SLM printing process on the structure and mechanical properties of products made of 12Cr18Ni10Ti alloy. Samples obtained by selective laser melting were subjected to pycnometric and metallographic analysis. Based on the obtained microstructure images, a digital porosity analysis of the work piece under study was performed in the Thixomet Pro software package. The microhardness and acoustic characteristics were also measured over the entire section of the work piece under study. It was revealed that with an increase in the distance from the substrate (0...112 mm) in the transverse and longitudinal sections, the tendency remains to decrease the density values and increase the volume fraction of pores. It is shown that the acoustic parameter Dc can be used to control changes in the physical and mechanical properties of stainless chromium-nickel steel blanks obtained by selective laser melting.

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Section: Introductionunclassified

Study of the Effect of Selective Laser Melting Parameters on the Structure and Physico-Mechanical Properties of a Blank Made of Stainless Chromium-Nickel Steel

Khlybov,

Ryabov,

Solovev

et al. 2023

Vestnik IzhGTU imeni M.T. Kalashnikova

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Коррозионностойкие Стали В Аддитивном Производстве

Колмаков

Ivannikov

Kaplan

et al. 2021

Izv. vysš. učebn. zaved., Čern. metall.

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This review discusses the main methods for producing spherical powder particles of corrosion-resistant steels as a material widely used in all industries. Also the examples of products made by modern additive methods are described. Currently, spherical powder particles of corrosion-resistant steels are used in the following additive methods: selective laser melting, selective laser sintering, direct laser sintering, and electron beam melting. Each of these methods has its own requirements for the characteristics of spherical powder particles of corrosion-resistant steels. The review provides a brief description of the principles of operation of each method and the requirements for spherical powder particles of corrosion-resistant steels. It also considers a detailed description of each method of additive manufacturing with a description of the principle of operation and specific examples of obtaining spherical particles of corrosion-resistant steel powders with indication of their properties (morphology, structural features, chemical composition, fluidity, bulk density). A comparative analysis was carried out with a description of disadvantages and advantages of each method. Examples of the use of spherical particles of corrosion-resistant steel powders for the manufacture of products by various additive methods (including post-processing) are given with description of the final products characteristics. Based on the data presented, a conclusion was made about the preferred methods for obtaining spherical particles of corrosion-resistant steel powders for specific additive methods used in modern industry. The review considers the following methods for producing spherical powder particles: water atomization (atomization of liquid metal with a jet of water under pressure); gas atomization (atomization of the melt with a jet of inert gas (argon or nitrogen) under pressure); centrifugal atomization (atomization of molten metal with a high-speed rotating disc); ultrasonic atomization (atomization of liquid metal by ultrasound); non-contact atomization (atomization of liquid metal with a powerful pulse of electric current); plasma wire spraying; plasma spraying of a rotating electrode; plasma spheroidization.

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Features of the impact of hot isostatic pressing and heat treatment on the structure and properties of maraging steel obtained by selective laser melting method

Kayasova

Левашов

2022

Izv. VUZ. Poroshk. Met.

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Using the SLM method in a nitrogen blanket with heating to a temperature of 200 °C, samples were obtained at a position of 0° against the build plate. The effect of the hot isostatic pressing (HIP) and heat treatment (HT: hardening + aging) on the structure and mechanical properties of maraging steel CL50 WS was studied (the Russian analogue is ChS4 grade). To analyze the effect of post-processing on the strength characteristics (σb, σ0,2, δ, ψ), tensile tests were conducted. Their results indicated high values of strength and ductility. It has been established that as a result of HT in the steel structure, in addition to α-Fe, γ-Fe, dispersed precipitates of the NiTi3 strengthening phase are formed, the identification of which was carried out by high-resolution transmission electron microscopy. Through the NiTi3 intermetallic phase, the steel has acquired increased tensile strength and yield strength required for the production of critical components and parts for highly loaded turbomachine disks. The change in the porosity of the samples before and after the HIP was analyzed. The microstructure of the samples and the changes that occur under the influence of various post-processing options are studied. The fine-grained homogeneous structure obtained by combining the SLM, HIP and HT provided optimal strength and ductility. Analysis of fractures after mechanical testing showed that the samples after postprocessing are destroyed according to the viscous-pitting mechanism with the formation of a neck.

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MICROSTRUCTURE AND PROPERTIES INVESTIGATIONS OF Fe–Cr–Ni STAINLESS STEEL OBTAINED BY SELECTIVE LASER MELTING

Cited by 3 publications

References 0 publications

Study of the Effect of Selective Laser Melting Parameters on the Structure and Physico-Mechanical Properties of a Blank Made of Stainless Chromium-Nickel Steel

Study of the Effect of Selective Laser Melting Parameters on the Structure and Physico-Mechanical Properties of a Blank Made of Stainless Chromium-Nickel Steel

Коррозионностойкие Стали В Аддитивном Производстве

Features of the impact of hot isostatic pressing and heat treatment on the structure and properties of maraging steel obtained by selective laser melting method

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