Jumaev А.А.
SELECTION OF THE OPTIMAL METHOD OF THE PURIFYING THE WHITE WEAR RESISTANCE OF IRON MAKE 300H32N2M2TL *
Аннотация:
The article presents the results of studies of the etching of white wear-resistant cast iron with the help of various reagents and presents the optimal technology for etching white wear-resistant cast iron
Ключевые слова:
microstructure, nitric acid, ethyl alcohol, hydrochloric acid, picric acid, ferric chloride, impact-abrasive wear, carbide phase, abrasive wear, high-chromium white cast iron, structure, chemical composition, high-alloy cast iron
The main structural components of white wear-resistant cast irons are carbides and a metal base. The main characteristics of carbides, which have a decisive influence on the wear resistance, mechanical and technological properties of white wear-resistant cast irons - the type of crystallographic lattice, morphology, quantity, size, orientation with respect to the wear surface [1]. Every year the operating conditions of machines that work in abrasive and hydroabrasive media become tougher. In this regard, increased requirements for the materials from which the cast parts of such machines and mechanisms are made [2]. Currently, the foundry of the Navoi Machine-Building Plant produces more than 117 tons of cast highchromium white cast iron per month [3]. Research methods and materials used. For research, specimens with dimensions of 25x20x20 mm were cast from white wear-resistant cast irons, grade 300X32H2M2TL, on an IChT-2.5 induction furnace (Manufactured in Russia). The chemical composition of the samples is determined by the emission spectral method on a Spectro-Lab instrument - M (Made in Germany). Microshift prepared on the grinding and polishing machine "NERIS" (pr-in Latvia). For grinding the samples, sanding pads with a grain size of 180 to 1500 microns were used. The polishing of the surface of the microsections is carried out with the help of Diamond WC brand paste. To identify the microstructure, microsections after polishing are subjected to chemical etching or electrochemical etching. The recommended application GOST 5639-82 provides the compositions and methods of etching. Recently, much attention has been paid to improving the quality of products. In accordance with the technical requirements along with the chemical composition, the macrostructure and microstructure of cast iron 300X32H2M2TL are subject to mandatory control. The microstructure of cast iron grade 300H32N2M2TL held in accordance with GOST 5639-82.
Номер журнала Вестник науки №6 (15) том 1
Ссылка для цитирования:
Jumaev А.А. SELECTION OF THE OPTIMAL METHOD OF THE PURIFYING THE WHITE WEAR RESISTANCE OF IRON MAKE 300H32N2M2TL // Вестник науки №6 (15) том 1. С. 9 - 12. 2019 г. ISSN 2712-8849 // Электронный ресурс: https://www.вестник-науки.рф/article/1479 (дата обращения: 23.04.2024 г.)
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