Affiliation:
1. Institute of Strength Physics and Materials Science, Siberian Branch of Russian Academy of Sciences
2. LLK Scientific Production Enterprise of Geophysical Equipment “Luch”
Abstract
The paper studies the influence of heat treatment modes on the structure and properties of austenitic steel grade 08Kh18N6AG10S. Austenitic structure with twinned boundaries was preserved after quenching at 1040 and 1100 ℃. At the same time, the average size of austenitic grains decreased from 42.3 ± 6 μm (supply condition) to 38.1 ± 5.0 and 39.0 ± 4.5 μm, respectively. Quenching at 1040 ℃ leads to release of excess carbide phases at the grain boundaries. Mainly manganese and silicon oxides were found after quenching at 1100 ℃. Quenching at 1040 ℃ leads to a slight decrease in microhardness (by 12 %) compared to the condition of supply (from 3285 ± 80 to 2895 ± 70 MPa). The hardness decreases less after quenching at 1100 ℃ (up to 3090 ± 80 MPa). Quenching at 1040 and 1100 ℃ has significantly improved the fracture toughness of steel. Values of impact strength of the steel increased to 223 ± 10 and 240 ± 5 J/cm2 compared to the condition of supply (55 J/cm2). The authors found that the steel samples demonstrate a comparable level of wear resistance during tests for abrasive wear compared to the condition of supply after quenching at 1040 and 1100 ℃. The mass loss after passing the roller distance of 4309 m for all steel conditions is approximately 8.0 %. The authors concluded that the most optimal heat treatment of 08Kh18N6AG10S steel is quenching at 1100 ℃, which improves the fracture toughness of steel while maintaining microhardness and wear resistance.
Publisher
National University of Science and Technology MISiS
Reference25 articles.
1. Brook B.W., Alonso A., Meneley D.A., Misak J., Blees T., van Erp J.B. Why nuclear energy is sustainable and has to be part of the energy mix. Sustainable Materials and Technologies. 2014;1-2:8–16. https://doi.org/10.1016/j.susmat.2014.11.001
2. Jia C., Pang X., Song Y. The mechanism of unconventional hydrocarbon formation: Hydrocarbon self-sealing and intermolecular forces. Petroleum Exploration and Development. 2021;48(3):507–526. https://doi.org/10.1016/s1876-3804(21)60042-3
3. Shevchenko I.A. Drilling wells with a large departure from the vertical, using a rotary-driven systems with control geophysical parameters in real-time. Modern Science: Actual Problems of Pheory and practice. Series: Natural and Technical Sciences. 2014;(1-2):36–39. (In Russ.).
4. Zakirov A.Ya. The first test results of Russian-made rotary-controlled systems. Proneft’. Professionally about oil. 2016;(2(2)):43–47. (In Russ.).
5. Zhang C., Zou W., Cheng N. Overview of rotary steerable system and its control methods. In: Proceedings of 2016 IEEE Int. Conf. on Mechatronics and Automation. 2016: 1559–1565. https://doi.org/10.1109/icma.2016.7558796