Automatic Welding, 2024, №03



2024 №03 (04)

DOI of Article 10.37434/as2024.03.05

2024 №03 (06)

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Avtomaticheskaya Svarka (Automatic Welding), #4, 2024, pp. 34-40

Structural-phase characteristics of damage to welded joints of TPP steam pipelines from heat-resistant steels

Leszek Chałko

Casimir Pulaski Radom University. ul. Malczewskiego 29, room 124, 26-600, Radom, Poland. E-mail: Leszek.chalko@uthrad.pl

than 280 thousand hours) under creep and fatigue conditions. It is established that the damage caused by creep and fatigue depends to a large extent on the structural and phase state of the metal of welded joints, which changes considerably during their long-term operation. With longer service life of welded joints, a ferrite-carbide mixture forms in their structure as one of the components. The presence of such a mixture contributes to acceleration of damage of welded joints. The dependence of formation of the ferritecarbide mixture on the initial structure of welded joints was established, and recommendations were given for producing an initial structure with improved quality characteristics, which is advisable for increasing their reliability and service life.
Keywords: steam pipelines, welded joints, heat-resistant steels, structure, damage, reliability, service life, creep pores, fatigue cracks

Received: 01.03.2024
Received in revised form: 08.04.2024
Accepted: 27.05.2024

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