Email this article THE INFLUENCE OF VARIOUS MODES OF POST-WELD HEAT TREATMENT ON THE STRUCTURAL AND MECHANICAL HETEROGENEITY OF WELDED JOINTS OF MEDIUM ALLOY STEELS PRODUCED BY ROTATIONAL FRICTION WELDING
- Authors: Priymak E.Y.1, Stepanchukova A.V.2, Tryakina N.Y.3, Fot A.P.1, Atamashkin A.S.1
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Affiliations:
- Orenburg State University, Orenburg
- ZBO Drill Industries Inc., Orenburg
- OOO “Gazprom transgaz Ekaterinburg”, Yekaterinburg
- Issue: No 4 (2017)
- Pages: 99-107
- Section: Technical Sciences
- URL: https://vektornaukitech.ru/jour/article/view/196
- DOI: https://doi.org/10.18323/2073-5073-2017-4-99-107
- ID: 196
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Abstract
Rotational friction welding is one of the promising technologies for the creation of high-quality welded joints, which is widely used in the pipe industry when producing wide nomenclature drill pipes of medium-carbon alloy steels. Despite the long-term application of this method by the Russian enterprises manufacturing this type of products, there are few published data in the scientific literature aimed at the detailed study of structural and mechanical heterogeneity of such compounds, including after various modes of their heat treatment.
The authors evaluated the structural and mechanical heterogeneity of welded joints of 30HGSA-40HN2MA steels tested to produce geological exploration drill pipes in the initial state and after the application of various temperature-time modes of induction annealing. The paper presents the results of hardness measurement in different areas of welded joint and the results of rupture test and impact-viscosity test.
During the study, the authors determined the peculiarities of phase transformations occurring in welded materials depending on the temperature and time factors that affected the degree of mechanical heterogeneity of the annealing zone and the level of mechanical properties, including the nature of impact fracture. It is shown, that, during the rupture tests, the mechanical properties of welded joints of 30HGSA-40HN2MA steels generally depend on the properties of thermomechanical impact zone of 30HGSA steel as the weakest area where the deformation is localized and the rupture occurs. The authors determined the formation of hardening structures during the induction annealing from the 40HN2MA steel side influencing the tendency for brittle fracture of the welded joint area. Optimal modes of heat treatment of this welded joint combination from the position of full-strength and reliability of the structure are recommended.
About the authors
Elena Yurievna Priymak
Orenburg State University, Orenburg
Author for correspondence.
Email: e.prijmak@zbo.ru
PhD (Engineering), Head of Laboratory “Metallurgical science and heat treatment”
Russian FederationAnna Viktorovna Stepanchukova
ZBO Drill Industries Inc., Orenburg
Email: annastep56@zbo.ru
postgraduate student, engineer-metallurgist of Laboratory “Metallurgical science and heat treatment”
Russian FederationNadezhda Yurievna Tryakina
OOO “Gazprom transgaz Ekaterinburg”, Yekaterinburg
Email: nadiamtm@yandex.ru
PhD (Engineering), engineer of 1st category
Russian FederationAndrey Petrovich Fot
Orenburg State University, Orenburg
Email: fot@mail.osu.ru
Doctor of Sciences (Engineering), Chief Scientific Secretary
Russian FederationArtem Sergeevich Atamashkin
Orenburg State University, Orenburg
Email: atamashkin2017@yandex.ru
postgraduate student
Russian FederationReferences
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