Abstract
The results obtained in investigations of stress corrosion specimens of 08Cr18Ni10Ti steel, produced by welding with electrodes with basic and rutile coatings, are discussed. We present the results of metallographic analysis of the surface of corrosion failure. Investigation of stress corrosion cracking tests performed by automatic measurement of deflection patterns, depending on the test time, using the displacement sensor. We found that two structural factors – structure homogeneity of weld metal and morphology of non-metallic inclusions – provide high corrosion resistance. The experimental results show that the metal of the welded joints in the high-alloy chromium-nickel austenitic steels produced with the electrodes with a basic coating has higher resistance to corrosion failure in the corrosive medium of chloride salts in comparison with the weld metal produced with the rutile electrodes.
Highlights
The problem of the corrosion resistance of constructions in a production environment is a relevant and important within the implementation of many technological processes
Chemical and phase analysis established the presence of titanium carbides in the weld made with rutile electrodes and the presence of niobium carbide in the weld made with basic electrode (Table 1)
While welding high-alloy steel by rutile electrodes type the main role in structure formation plays process of welded joint metal modifying by titanium
Summary
The problem of the corrosion resistance of constructions in a production environment is a relevant and important within the implementation of many technological processes. Structure and properties of products produced of high-alloy corrosion resistant steels are strongly dependent on processing by high-temperature energy sources: plasma, laser surface treatment, arc welding, electron beam treatment (A.G.Aleksandrov, Yu.N.Savonov,1992). Equipment made of these steels can be damaged in service and fail as a result of the fact that the austenitic chromium–nickel steels are highly susceptible to corrosion cracking in the solutions of chlorides and alkali. In this case, failure starts without any visible traces of corrosion.
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