THEORETICAL AND TECHNOLOGICAL PRINCIPLES OF SOFTENING THERMOMECHANICAL TREATMENT OF WELDING WIRE ROD
DOI:
https://doi.org/10.34185/1991-7848.itmm.2024.01.010Keywords:
welding wire rod, thermomechanical treatment, two-stage cooling line , cooling mode.Abstract
The theoretical justification of the prerequisites for the plasticization of welding wire rod from alloy steels due to the management of the processes of structure formation during cooling of the metal after hot plastic deformation is given. It is shown that the processes of metadynamic and static recrystallization of austenite, which occur after dynamic recrystallization and static polygonization, are decisive in the softening schemes of thermomechanical treatment of wire rod. The softening effect during thermomechanical treatment is achieved by adjusting the size of the dynamically recrystallized austenite grain through accelerated water cooling of the metal from the temperature of finish hot deformation to the temperature of the folding out of the wire rod into coils before the start of the air-cooling stage on the "Stelmore" line. The transformation of fine-grained austenite begins at higher temperatures compared to coarse-grained and is accompanied by the formation of a larger fraction of structurally free ferrite and a decrease in the fraction of bainite and martensite during the subsequent slow cooling on the conveyor under heat-insulating covers. The structural features of the "Stelmor" line, necessary for the effective implementation of the process of softening thermomechanical treatment of welding wire rod, are considered.
References
Degarmo E. P., Black J. T., Kohser R. A. Materials and Processes in Manufacturing (9th ed.). 2003. Wiley. 388 p.
Parusov E. V., Sychkov O. B., Gubenko S. I., Malashkin S. O., Sahura L. V. About effective ways of improving the modes of regulated air cooling of wire rod in industrial conditions. Scientific works of VNTU. 2017. No. 3. P. 1–9.
Parusov V. V., Parusov O. V., Chuyko I. N., Sychkov A. B. Scientific and technological aspects of high-grade rolled wire production. Metallurgical and Mining Industry. 2010. Vol. 2. No. 2. P. 137–142.
Raabe D. Recovery and Recrystallization: Phenomena, Physics, Models, Simulation. Physical Metallurgy (5th ed.). 2014. P. 2291–2397.
DOI: 10.1016/B978-0-444-53770-6.00023-X.
Montheillet F., Lépinoux J., Weygand D., Rauch E. Dynamic and Static Recrystallization. Advanced Engineering Materials. 2001. Vol. 3. Iss. 8. P. 587–589.
DOI: 10.1002/1527-2648(200108)3:8<587::AID-ADEM587>3.0.CO;2-V
Parusov V. V., Chuyko I. N., Parusov O. V., Sychkov A. B., Suhomlin V. I. Scientific and technological aspects of production wire rod enhanceable ability for deformation from steels of Sv-08GNM and Sv-08G1NMA grades. Metallurgical and Mining Industry. 2013.
No. 6. P. 61–64.
