Title: Study of substitution of carburised 16MnCr5 used in sub-axis of machine tool spindle by carbonitrided steel

Authors: Mir Nariman Yoozbashi

Addresses: University of Applied Science and Technology, End of Taleghani Street, Tabriz, IR, Iran Fax: +98-41-35430403

Abstract: The focus of the current study is using carbonitrided 16MnCr5 instead carburised steel in the sub-axis of machine tool spindles by investigation on the impact fracture toughness and fatigue strength of 16MnCr5 steel. Samples after preparation were surface treated by carburising and carbonitriding treatments. The characteristics of toughness and fatigue were presented through impact test and rotating bending fatigue machine. To clarify toughness variation mechanisms, and relation with microstructure, observations of microstructure and fracture surfaces carried out by optical microscopy and scanning electron microscopy. Microhardness tests and roughness were evaluated by using equipment. The experimental results showed that, carburised and carbonitrided specimens are relatively similar in properties such as microstructure feature and how to fracture and differ in properties such as hardness distribution, depth of hardened layer, impact energy and roughness. In general, it can be claimed that in the spindle sub-axis, carbonitriding treatment is a good alternative to carburising.

Keywords: 16MnCr5; carburising; carbonitriding; spindle; microstructure; mechanical properties.

DOI: 10.1504/IJMATEI.2023.128267

International Journal of Materials Engineering Innovation, 2023 Vol.14 No.1, pp.79 - 93

Received: 31 Oct 2021
Accepted: 18 Jan 2022
Published online: 16 Jan 2023 *