Investigation of the Surface Layer Structure of High-Chromium and High-Strength Steels at the Variation of the Heating Temperature

Abstract:

At present, hard-to-machine materials such as structural alloy steels with various chemical element additives – tungsten, chromium, etc. - are most widely used in engineering. When conventional finish methods are used for the treatment of hard-to-machine materials, the most important problems are the difficulty of obtaining work surfaces of a required quality in terms of accuracy, roughness and the physicochemical composition, and the low output. In the present paper, a finish method for metal treatment– grinding – is discussed. Zones of the formation of the surface stress state due to heating have been revealed: the zone of an insignificant increase in temperature in the contour of the contact of a grinding wheel and a work surface; the zone of the temperature intensive growth; and the zone of the temperature abrupt drop. The investigation has been conducted of the surface layer structure of high-strength and high-chromium steels during high-speed heating – grinding. The peculiarities of the change of the surface layer state of the above steels have been revealed after grinding with the use of conventional grinding wheels with a continuous cutting surface and a discontinuous cutting surface. Some recommendations are given for grinding of the high-strength ₁₂Cr₁₈Ni₉ and high-chromium Cr₁₂, Cr₁₂Mo and Cr₁₂V steels, taking into account the specific features of different technological situation characteristic of a specific grinding tool, a grinding tool grade, and conditions of grinding and cutting.

• Periodical: Materials Science Forum (Volume 870)
• Pages: 431-436
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.870.431
• Online since: September 2016
• Authors: Vyacheslav B. Dementyev, T.N. Ivanova*
• Keywords: Austenite, Grinding, Grinding Wheel with Continuous Cutting Surface (CCS-Wheel), Grinding Wheel with Non-Continuous Cutting Surface (NCCS-Wheel), High-Chromium Steels, High-Speed Heating, High-Strength Steel, Martensite, Stress State

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