Study of the Features of Obtaining Bimetallic Pipes and Rods by Explosion Welding with Subsequent Hot Deformation
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TECHNOLOGIES FOR DESIGN AND PROCESSING OF MATERIALS
Study of the Features of Obtaining Bimetallic Pipes and Rods by Explosion Welding with Subsequent Hot Deformation A. Yu. Malakhova, I. V. Saikova, *, I. V. Denisova, G. R. Saikovaa, Yu. V. Gaminb, B. A. Romantsevb, and P. Yu. Gulyaevc aMerzhanov
Institute of Structural Macrokinetics and Materials Science, Russian Academy of Sciences, Chernogolovka, Moscow oblast, 142432 Russia b National University of Science and Technology MISiS, Moscow, 119049 Russia cYugra State University, Khanty-Mansiysk, 628012 Russia *e-mail: [email protected] Received June 27, 2019; revised July 22, 2019; accepted July 24, 2019
Abstract—In this paper, we study the features of obtaining bimetallic pipes and rods using explosion welding and subsequent hot deformation. Explosion welding allowed obtaining continuous cylindrical two-layer billets with a combination of steel 20 + 08Cr18Ni10Ti layers with almost 100% adhesion of the layers, without surface defects, and with a specified residual deformation in diameter. We determined that replacing the atmosphere with helium in the welding gap does not reduce or eliminate microdefects in the joint. Subsequent hot plastic deformation did not affect the ratio of the component layer thicknesses. A combined technology for the production of bimetallic pipes and rods with a combination of steel 20 + 08Cr18Ni10Ti layers, which allows obtaining pipes and rods with a corrosion-resistant coating and sizes that are included in the range of pipes used in the energy industry, was developed and tested. Keywords: explosion welding, bimetallic billets, hot deformation, hardening, microhardness of layers DOI: 10.1134/S2075113320050202
INTRODUCTION Bimetallic materials are widely used in various fields of mechanical engineering. Often, monometallic structures do not meet the necessary requirements for corrosion resistance and specific gravity. Depending on the operating conditions, the surface of steel products must be protected by cladding them with a corrosion-resistant layer. In particular, the issue of increasing the service life of oil and boiler assortment pipes is relevant. Increasing the service life and reliability of boiler equipment and steam pipelines is impossible without improving the quality of superheater and steam pipes [1]. Obtaining bimetallic billets and pipes is possible by various technological methods: cladding, rolling, combined insertion and rolling technology, diffusion welding, explosion welding, etc. From the manufacturability and performance viewpoint, screw insertion and radial-shear rolling technologies (or their combination) are optimal and widely applicable methods for obtaining various products with a wide size and grade assortment: pipes, rods, hollow bodies of revolution, etc. [2, 3]. Obtaining bimetallic pipes and rods with a corrosion-resistant coating by explosion welding followed by hot insertion/rolling in this sense is an urgent scientific and technical problem.
Explosion welding in some cases is the best way to obtain bi
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