The Paton Welding Journal, 2024, №07



2024 №07 (01)

DOI of Article 10.37434/tpwj2024.07.02

2024 №07 (03)

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The Paton Welding Journal, 2024, #7, 10-16 pages

Structural-phase characteristics of damage to welded joints of tpp steam pipelines from heat-resistant steels (Review)

L. Chałko

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

Abstract
The paper considers the peculiarities of damage to welded joints of steam pipelines that have been operated for a long time (more than 280 thou h) under creep and fatigue conditions. It was established that the damage caused by creep and fatigue depends to a large extent on a structural-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 to welded joints. The dependence of formation of the ferrite-carbide 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, pores, fatigue cracks

Received: 01.03.2024
Received in revised form: 08.05.2024
Accepted: 30.07.2024

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Suggested Citation

L. Chałko (2024) Structural-phase characteristics of damage to welded joints of tpp steam pipelines from heat-resistant steels (Review). The Paton Welding J., 07, 10-16.

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