2015 №12 (04) DOI of Article
2015 №12 (06)

The Paton Welding Journal 2015 #12
TPWJ, 2015, #12, 24-28 pages
Structural changes in metal of welded joints of steam pipelines in operation

Journal                    The Paton Welding Journal
Publisher                 International Association «Welding»
ISSN                      0957-798X (print)
Issue                       № 12, 2015 (December)
Pages                      24-28
V.V. Dmitrik1, O.V. Sobol1, M.A. Pogrebnoj1, A.V. Glushko1 And G.I. Ishchenko2
1NTU «Kharkov Polytechnic Institute». 21 Frunze Str., 61022, Kharkov, Ukraine. E-mail: svarka126@ukr.net
2OJSC «Turboatom». 199 Moskovsky Ave., Kharkov, Ukraine. E-mail: office@turboatom.com.ua
Extension of service life of steam pipelines is a relevant task. Investigation of peculiarities of structural state in metal of welded joints of long-lasting operation steam pipelines allows evaluating a level of their damageability and grounding residual life. This study determined that structural changes of welded joints from 15Kh1M1F and 12Kh1MF steels are caused by diffusion processes, formation of intergranular segregations, carbide reactions, nucleation and propagation of creep pores. The ways are outlined for regulation of structural state of metal of HAZ areas, which are directed at reduction of structural inhomogeneity and extension of service life. 10 Ref., 10 Figures.
Keywords: heat-resistant steels, steam pipeline welded joints, structure, carbides, pores, damageability, diffusion, deformation, heat-affected zone
Received:                20.05.15
Published:               21.01.16
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