Preliminary communication

https://doi.org/10.17559/TV-20180327165425

Bainitic Transformation in High-Speed Steels

Julieta Kaleicheva orcid.org/0000-0002-7191-9335 ; Technical University of Sofia, Faculty of Industrial Technology, 8 Kl. Ohridski blvd., 1000 Sofia, Bulgaria
Valentin Mishev ; Technical University of Sofia, Faculty of Industrial Technology, 8 Kl. Ohridski blvd., 1000 Sofia, Bulgaria

Abstract

The investigation on the structure formation in the bainitic area for high-speed steel HS18-0-1 is performed. The austempering is carried out at 270 °С after austenitizing at 1280 °С following by isothermal retention in the area of high resistance of the undercooled austenite(500÷650°С). The kinetic of the bainitic transformation, the obtained structure by means of optical metallography (OM), transmission electron microscope (TEM), X-ray analysis and hardness measurement by Rockwell method are studied. The influence of the preliminary destabilisation of the undercooled austenite at 560 °C and 650 °C on the characteristics of the austenite-to-bainitе transformation in steel HS18-0-1 is established.

Keywords

α-phase; austempering; bainitic ferrite; bainitic transformation; carbides; high-speed steel; retained austenite

Hrčak ID:

226046

URI

https://hrcak.srce.hr/226046

Publication date:

8.10.2019.

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