Automatic Welding, 2018, №10



2018 №10 (01)

DOI of Article 10.15407/as2018.10.02

2018 №10 (03)

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Avtomaticheskaya Svarka (Automatic Welding), #10, 2018, с. 11-16
 

Influence of thermal cycle of welding on structure and mechanical properties of haz metal in high-strength steel produced by controlled rolling

V.D. Poznyakov, A.V. Zavdoveev, S.L. Zdanov, A.V. Maksymenko

E.O. Paton Electric Welding Institute of the NAS of Ukraine, 11 Kazimir Malevich Str., 03680, Kyiv. E-mail: office@paton.kiev.ua

At present there is a tendency to develop high-strength alloyed steel with yield strengh more than 590 MPa, in which heat treatment (quenching and tempering) is replaced by the process of controlled rolling with subsequent accelerated cooling. Application of technologies of welding such steels is now based only on recommendations of the manufacturer of metal and welding consumables, as well as carbon equivalent. Considering that the new generation of steels, including alform 620M was produced due to complex application of both microalloying, and thermomechanical treatment with subsequent accelerated cooling, the obtained properties can be lost as a result of softening during processing stages, related to steel heating. As the level of the change of mechanical properties of HAZ metal determines steel weldability, the influence of thermal cycles of welding on the properties and structure of HAZ metal in high-strength steel alform 620M is considered at the first stage of investigations. Performed investigations revealed that optimum combinations of mechanical properties and structure can be achieved at the rate of cooling of metal of welded joint HAZ more than 25 °C/s. 10 Ref., 2 Tabl., 4 Fig.
Keywords: high-strength steel, controlled rolling, thermal cycles of welding, heat-affected zone, structure, properties

Received: 19.07.2018
Published: 25.10.2018

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