Wear Resistance of Structural Steels as a Result of Boronising Operations

Abstract

This paper presents the results of investigations on the effect of thermochemical treatment, boronising and chemical composition of selected structural steels on their wear in sliding friction process. The operation of boronising on C45, 37CrNiMo, 42CrMo6, 41Cr4, 50CrSi4-4 steels was performed by powder method at 950°C for 8 h. Following this operation, rod sections of the test steels were subjected to quench hardening from 850°C with isothermal holding at 300°C for 1h. The assessment of the construction, thickness and microhardness of boronised layers depending on the level of carbon and alloying elements in chemical composition of analysed steels was made. The testing for wear resistance of steels after boronising was carried out with the sliding friction method by applying a load of 150 N, counter-sample rotational speed of 1000 rpm and using aqueous solution of potassium chromate as a cooling medium. The metallographic observations of the structure and thickness measurement of the boronised layers were carried out using a light microscope, while the identification of phases was made by the X-ray qualitative analysis method. The hardness and microhardness measurements were taken by the Vickers method.

The influence of the applied type of cooling after eight-stage hot compression test on the structure and mechanical properties of TRIPLEX type steels

“…Lowering the temperature of thermo-mechanical treatment to 850°C causes the increase of the maximum value of the flow stress to about 485 MPa for both steels. The reduction of the real deformation value in the subsequent stages of the eight-stage thermo-mechanical treatment and the reduction of the deformation temperature causes that the process which removes of strain hardening is the static or metadynamic recrystallisation taking place in the intervals between the individual strains [27].…”

Analysis of the Abrasive-Type Influence on the Effectiveness of Rotary Cleaning of Machine Parts with Complex Geometric Features

“…The effects of this process are losses—direct ones, related to the costs of damaged materials and construction protection, as well as indirect ones, related to the operation of machines. Contemporary research on corrosion tends to multi-directionality, becoming increasingly complex and expensive [ 6 , 7 , 8 , 9 , 10 ]. The low corrosion resistance of construction materials is an obstacle in various fields of machine development, which is why it is so important to invest in research contributing to the theoretical and practical knowledge about the sources of corrosion and the means of minimizing it [ 11 , 12 , 13 ].…”