Original scientific paper

Properties of low-alloy high-speed steel at elevated temperature

J. Jaworski ; Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Rzeszów, Poland
T. Trzepieciński ; Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Rzeszów, Poland

Abstract

This paper presents the results of research on the determination of the coefficient of thermal conductivity and hot hardness of cutters made of selected grades of low-alloy high-speed steels, HS 6-5-2 and HS3-1-2. The investigations of hot hardness and yield stress values of HS6-5-2 steel at elevated temperatures have shown that the hot hardness value decreased to 650 – 700 HV (59 – 60 HRC) in the temperature range of 500 – 550 °C. However, the hardness of the samples preheated to the temperature of 500 – 550 °C and measured at room temperature does not change. A decrease of the hot hardness of the steel is correlated with decreasing yield stress at elevated temperature.

Keywords

low-alloy steel; high-speed steel; temperature; hardness; thermal conductivity

Hrčak ID:

168888

URI

https://hrcak.srce.hr/168888

Publication date:

2.1.2017.

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