Composition, structure and microhardness of steel samples after induction nitriding were studied in the work. As a result of high-temperature nitriding, saturation of R6M5 steel with nitrogen was observed as its content in the surface layer changed from 4.19 to 7.3 at.%. The maximum surface microhardness of the samples was 1950±70 HV0.98. The possibility of the formation of strengthened diffusion layers up to 200 μm deep and having microhardness up to 1500±50 HV0.98 on R6M5 steel was established. The parameters of the depth of the diffusion layer and microhardness depended on the heating temperature of the specimens and the processing duration in the course of induction nitriding.
Currently, there are various methods allowing the improvement of the physical and mechanical properties of metalworking tools. Gas nitriding is one of the given methods. In this work, the improvement of the physical and mechanical properties of high-speed tool steel products using induction chemical thermal treatment (ICTT) in a nitrogen-containing environment is proposed. As a result of the use of short-term treatment by the ICTT method, the hardness of the surface layer of products reaches at least 17–20 GPa with a layer thickness within 0.8 mm. The proposed method enables the improvement of the functional qualities of metalworking products operating under the conditions of friction with increased contact loads.
In the course of high-temperature treatment with high-frequency currents (HFC) in the range from 600 to 1300 °C, carbon and tool steels are strengthened. After the heat treatment the hardness reaches 64-70 HRC for carbon steel (carbon content 0.4-0.5%) and 68-71 HRC for tool steel 1.3343 (R6M5 steel analogue with 0.9-1.0% C content, W – 5-6 wt%, Mo – 3.5-5.3 wt%, V – 1.3-1.8 wt%, Cr – 3.8-4.3 wt%, Mn+Si – 0.5-1 wt%, Fe – balance). The resulting structure is a carbide network, and in the case of tool steel – complex carbides around a high-strength martensitic phase.
Research results on the chemical composition and surface morphological characteristics of zirconium products after machining and treatment with high-frequency currents are described. It was established that at the temperature range from 600 to 1200 °C and duration of heat treatment from 30 to 300 seconds oxide coatings consisting of nano-grains are formed.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.