Composition, Structure and Properties of Bimetallic Materials Prepared by Copper Alloy Surfacing on Low-Alloy High-Stren
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ACE ENGINEERING UDC 621.791.019:669.35’71:669.35’24
COMPOSITION, STRUCTURE AND PROPERTIES OF BIMETALLIC MATERIALS PREPARED BY COPPER ALLOY SURFACING ON LOW-ALLOY HIGH-STRENGTH STEEL S. A. Pichuzhkin,1 A. A. Vainerman,1 S. P. Chernobaev,1 and A. V. Tsemenko2 Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 5, pp. 25 – 29, May, 2020.
The quality, structure, chemical composition and mechanical properties of bimetallic materials prepared by argon-arc surfacing of copper alloys MNZhKT 5-1-0.2-0.2, Sv-MN18, Sv-MNZhMtsTK 40-1-1-0.3-0.1, MMts40, BrAZhNMts 8.5-4-5-1.5 and Monel NMZhMts 28-2.5-1.5 on high-strength low-alloy steel AB3 are investigated. It is shown that during surfacing copper alloys on steel, high-quality bimetal is provided without defects in the form of cracks, significant porosity, unmelted areas, or exfoliation.
Key words: bimetal, surfacing, copper alloy, high strength steel, intercrystalline penetration.
The aim of the present work is a study of the composition, structure, and properties of bimetal compounds obtained by argon-arc surfacing of various copper alloys on high-strength low-alloy steel type AB3.
INTRODUCTION Currently there is greater use in various branches of industry of objects made from low-alloy, high-strength steels with copper alloy surfacing. Copper alloys exhibit relatively good corrosion resistance in sea water, a satisfactory strength level under static and variable loading conditions, good antifriction properties, thermal and electrical conductivity, resistance to fouling by micro-organisms in sea water, providing the required set of properties for bimetal joints [1, 5, 13, 14, 17]. There is also extensive use of the bimetal structures not only for engineering but also for economic advantages. Surfacing (welding) of copper on steels (with steels) has features that are noted in domestic and overseas research work [1 – 12, 15, 16]. As a result of surfacing copper alloys on steel in the melting area the two metals from a material differing considerably with respect to composition, structure, and properties of the original metals. 1
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METHODS OF STUDY The bimetal joints studied are a plate of steel AB3 (09KhN3MD) 15 mm thick, surface with welding wires made from copper alloys. The average content of the main elements in welding used in the work are provide Table 1. Bimetal was prepared by surfacing a coating on steel with welding wires (Table 1) by argon-arc melting with an infusible electrode with a current of 180 – 200 A using Faltig-400 AC/DC equipment. Surfacing using wire BrAZhNMts 8.5-4.5-1.5 was performed with an alternating current and in the rest of the cases with a direct polarity current. Metallographic studies of the structure were conducted using an Axiovert 40 Mat and Axioobserver.A1m microscopes. The chemical composition of a surface coating in different areas of bimetal was studied using a TESCAN VEGA II scanning electron microscope combined with an INCA X-Max-50 energy dispersion spectrometer.
Central Research Institute of Structural Materi
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