Дослідно-експериментальна партія виливків, отриманих за допомогою дисперсно-наповнених моделей, що газифікуються

• Date: 2023
• Main Authors: Небожак, І. А., Небожак, Я. І., Пересенчук, В. В., Шинський, О. Й.
• Format: Article
• Language: Ukrainian
• Published: Physico-technological Institute of Metals and Alloys 2023
• Subjects: армування; графітизуюче модифікування; ЛГМ-процес; легування; ливарний алюмінієвий сплав марки АК12 ДСТУ 2839:1994; ЛКМ системи [Al – FeCr]; механічні характеристики; мікроструктура; сірий чавун марки СЧ300 ДСТУ 8833:2019; триботехнічні властивості; хромистий зносо-; жаротривкий чавун марки ЧХ3 ДСТУ 8851:2019
• Online Access: https://www.metalsandcasting.com/index.php/mcu/article/view/88
• Journal Title: Metal and Casting of Ukraine

On the example of cast blanks of the drive sprocket (АПД-33501026.273), the fire grate (АПД-33501026.265) and the spray tip (АПД-33501026.271) technologies were developed, respectively, graphitizing modification of the structure of gray cast iron with disperse ferrosilicon FeSi75 grade DSTU 4127:2002 (ISO 5445:1980, NEQ), alloying of cast iron melt with ferrochromium FeCr650А grade DSTU 3548:1997 and reinforcement of cast aluminum alloy AK12 grade DSTU 2839:1994 with disperse FeCr intermetallic, which is better known as σ-phase in the “Fe – Cr” system alloys, in industrial scales. As a result, pilot samples of gray cast iron СЧ300 grade DSTU 8833:2019, chromium wear-resistant, heat-resistant cast iron ЧХ3 grade DSTU 8851:2019 and isotropic cast composite material of the [Al – FeCr] system were obtained, and their complex production tests were performed. The results of metallographic analysis and mechanical tests of tidal cast samples showed that the studied structural materials have optimal microstructure (topography and morphology of eutectic and other inclusions) and high mechanical characteristics (tensile strength, bending resistance, specific elongation (tensile strain) and Brinell hardness). The wear tests of zero-dimensional cast composite material of the [Al – FeCr] system under dry friction, which were carried out using a laboratory installation (friction machine) model “MT-68”, revealed that its tribotechnical properties (parameters of tribostructure, wear and friction coefficient) significantly exceed the similar characteristics of the cast aluminum alloy AK12 grade DSTU 2839:1994, on the basis of which this composite was obtained. From test castings, an experimental batch of finished workpieces was made by metalcutting, and their tests were carried out in conditions as close as possible to the operating conditions. The results of these tests showed that the workpieces obtained in this way meet all the requirements of design and technological documentation, and in the future can be used in the conditions of real production for its functional purpose.