Formation of Structure, Texture and Properties and Control of Continuous Induction Heat Treatment of Brass Strips
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NICAL INFORMATION UDC 548.735.6:621.365.5:621.785.374:658.56:669.35
FORMATION OF STRUCTURE, TEXTURE AND PROPERTIES AND CONTROL OF CONTINUOUS INDUCTION HEAT TREATMENT OF BRASS STRIPS M. Z. Pevzner1 and S. G. Khayutin2 Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 8, pp. 48 – 54, August, 2020.
The texture, structure and mechanical properties of thick strips from brass L63 produced by different methods and then annealed in a continuous cycle in a transverse magnetic field or statically (in coils) in an in-and-out furnace are studied. The effect of the mode of preliminary treatment on the relation between the texture and the properties of the annealed strips is considered. Reliable enough equations relating the texture parameter used earlier for controlling fcc materials and low-alloy alloys based on them with the properties of the strips are derived. The prospects and the efficiency of online texture control of the properties of thick strips subjected to continuous induction annealing are considered.
Key words: transverse magnetic field, online control, process control, texture parameter, continuous annealing, brass strips, recrystallization texture.
of the annealed sheet on the properties, and the inevitable fluctuations of the heating regime, the properties and the heat treatment mode should be controlled continuously. Since it is impossible to organize direct continuous control of most of the properties, specialists work at indirect control, i.e., measurement of a parameter related closely to the properties. The most promising diffraction method for controlling the structure of materials [6] is to assess the crystallographic texture [7]. Devices containing an x-ray tube and a detector controlling two lines have turned out to be the most efficient in continuous online control of properties due to the relative simplicity of the equipment, software and installation into the production process [7]. It has been shown that the texture parameters (TP) obtained in this way correlate not only with the characteristics of the anisotropy of properties [8 – 10] but also with the most frequently controlled mechanical properties [11 – 15]. Universal texture analyzers containing five detectors make it possible to calculate rather accurately the distribution function of the orientations and the anisotropy parameters [16, 17]. However, it is especially important for online control to determine a simple statistical relation between the texture parameters and other characteristics of the material (for example, mechanical
INTRODUCTION Advancement of efficient processes of induction heat treatment of rolled sheets [1, 2] including those employing transverse flux induction heating (TFIH) [3, 4], which is a power-saving and fast-energy-transfer process, remains an important task. However, in addition to the considerable advantages TFIH has a drawback typical for continuous heat treatment, i.e., inhomogeneity of properties over the length of the annealed sheet, which depends on the fluctuations of its thickness
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