Wear Resistance of Austempered Ductile Iron with Nanosized Additives

9th International Conference on Tribology

Kaleicheva, J.K.^1 ; Mishev, V.^1

Technical University of Sofia, Department of Materials Science and Technology, Sofia

1000, Bulgaria^1

关键词: Accelerated testing method;    Austempered ductile irons;    Bainitic structure;    Fixed abrasives;    Friction conditions;    Microstructure and mechanical properties;    Nanoadditives;    Wear-testing;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/295/1/012034/pdf
DOI  :  10.1088/1757-899X/295/1/012034

来源: IOP

【 摘 要 】

The wear resistance, microstructure and mechanical properties of austempered ductile iron (ADI) with nanosized additives of cubic boron nitride cBN are investigated. Samples of ductile iron are put under austhempering at the following conditions: heating at 900°C, 1 h and isothermal retention at 280°C, 2 h and 380°C, 2 h with the aim to achieve a lower bainitic structure and an upper bainitic structure. The experimental wear testing of austempered ductile irons is performed in friction conditions of a fixed abrasive by a cinematic scheme "pin - disc" using an accelerated testing method and device. The microstructure of the ADI is investigated by metallographic and X-Ray analyses. The Vickers hardness testing and impact strength examination are carried out. The influence of the nanosized additives of cBN on the wear resistance, microstructure, impact strength and hardness of the ADI is investigated.