Tribo-fatigue Behavior of Austempered Ductile Iron MoNiCa as New Structural Material for Rail-wheel System

Abstract

This research presents the results of tribo-fatigue behavior of austempered ductile cast iron MoNiCa and gives a comparison with standard grades of steel and cast iron. Due to the possibility to combine the castability of cast iron and toughness of steel in one material, new structural material MoNiCa attracted attention of industry and science because of economic benefits and high performance at the different application areas. After successful former experiments the main directions of further development of research for solving relevant practical wear and fatigue problems in rail-wheel system were framed. The complex experimental studies have demonstrated that MoNiCa is consistent with heat treated steels including the rail steels: required tensile strength of rail steel ranges from 1180 MPa to 1280 MPa when rolling surface hardness have to be from 38 HRC to 44 HRC whereas new structural material showed higher tensile strength up to 1400 MPa and slightly higher hardness up to 50 HRC. Herewith the workability of frictional couple cast iron MoNiCa/steel 20MnCr5G exceeds work performance of steel/steel system by 14 %.

Experimental Investigation on the Influence of Depth on Rockburst Characteristics in Circular Tunnels

“…The combination of the micro camera and the X -direction loading block is shown in Figure 3 d. The stress monitoring system is composed of a true-triaxial frame, a servo controller, an external digital controller, a force sensor, a data acquisition instrument, a computer and a rock true-triaxial servo control software. The true-triaxial frame and the loading blocks are composed of high-rigidity metal materials, which have high compressive strength, tensile strength and strong resistance to deformation [ 47 , 48 , 49 ]. During the test, the experimenter transmits load command to be applied to the servo controller through the computer and rock true-triaxial servo control software, and then it controls the oil pump to apply the corresponding oil pressure, which pushes the loading rod to act on the loading block, and finally realizes sample loading.…”

Analysis, Evaluation and Exact Tracking of the Finite Precision Error Generated in Arbitrary Number of Multiplications

“…1. In research associated with the modelling of the fatigue of materials employed in the rail-wheel system ( [21], [22]). 2.…”

Study on the Influence of Process Parameters on Machining Force in Turning ADI by Response Surface Methodology

“…ADI (austempered ductile iron) has many unique advantages of high toughness, high wear resistance, as well as low production cost, and has been gradually applied to construction machinery, metallurgical machinery, automobile, and other fields [1][2][3][4] . However, ADI is kind of typical difficult-to-machine material.…”