Evolution of the structure and mechanical properties of a bulk-nitrided corrosion-resistant ferritic steel upon tempering in the temperature range of 400–700°C
- Authors: Rogachev S.O.1, Nikulin S.A.1, Khatkevich V.M.1
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Affiliations:
- National University of Science and Technology MISiS
- Issue: Vol 118, No 8 (2017)
- Pages: 782-787
- Section: Strength and Plasticity
- URL: https://journals.rcsi.science/0031-918X/article/view/167172
- DOI: https://doi.org/10.1134/S0031918X17080130
- ID: 167172
Cite item
Abstract
Methods of the X-ray diffraction analysis and electron microscopy were used to study changes in the structural phase state and mechanical properties of bulk-nitrided 08Kh17T steel (0.08 wt % C, 17 wt % Cr, 0.8 wt % Ti, 0.5 wt % Si, 0.8 wt % Mn, 0.025 wt % S, and 0.035 wt % P) upon tempering in the temperature range of 400–700°C. The changes in the mechanical properties of the nitrided steel upon tempering are associated with the predominance of either the solid-solution or precipitation strengthening, i.e., with the presence of martensite in the steel structure at low temperatures of tempering and the precipitation of particles of Cr2N nitrides of different dispersity upon increasing the tempering temperature. The greatest increase in the ultimate tensile strength and yield stress (1.8–2.5 times) at a satisfactory plasticity (no less than 10%) of the bulk-nitrided steel is achieved by tempering bulk-nitrided steel in a temperature range of 600–700°C.
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About the authors
S. O. Rogachev
National University of Science and Technology MISiS
Author for correspondence.
Email: csaap@mail.ru
Russian Federation, Leninskii pr. 3, Moscow, 119049
S. A. Nikulin
National University of Science and Technology MISiS
Email: csaap@mail.ru
Russian Federation, Leninskii pr. 3, Moscow, 119049
V. M. Khatkevich
National University of Science and Technology MISiS
Email: csaap@mail.ru
Russian Federation, Leninskii pr. 3, Moscow, 119049