A modern user requires low operating costs, but also reliability from machines and technical devices. Reliability during the service life depends on the quality of construction solutions, but also largely on the quality, properties and adaptation to the working conditions used in the construction of construction materials. During the operation of technical objects, their a highly predictable wear occurs. The problem is the phenomena of premature wear and damage of elements. The causes of failure of technical facilities are usually complex and depend on many factors. They can include the human factor and the one related to the quality, selection, production and technological processes of the materials used in the construc-tion of the facility. In real technical facilities, many premature failures are caused by material fatigue, which is related to the quality and distribution of impurities in the material. The paper presents the change in fatigue strength for rotational bending of low-carbon structural steel hardened and tempered at different temperatures as the effect of the size and distance between impurities on the fatigue strength of high-quality carbon structural steel melted in the industrial conditions in an electric arc furnace. 

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Influence The Size And Distances Between the Impurities On Fatigue Strength High Quality Carbon Structural Steel Melted In Electric Arc Furnace

In this paper, the effects of rolling parameters on the mechanical properties of the experimental steels are analyzed by means of thermal simulation, controlling rolling and cold control in the laboratory. As the wheel’s work under random loads, the failure modes of the wheels are mainly caused by the damages of strength and fatigue, in which more than 80% are caused by fatigue damage. So that the life of wheel's fatigue is the most important performance index of the wheel. At present, the domestic research on the fatigue performance is automobile wheel steel, especially for different organizations of automotive wheels with high strength steel fatigue performance differences are still relatively less. On the basis of hot rolling experiment, the fatigue test of high strength steel for different wheels is carried out by using high frequency fatigue testing machine. The fatigue performance of different high strength steel is studied by drawing the fatigue life curve. The main conclusion is as the following. The final cooling temperature is 630°C, the Rm increases from 766°C to 820°C, Rm increases from 720MPa to 748MPa, Rp0.2 increases from 463MPa to 525MPa, and the elongation reaches 20.0%. The change is not obvious. When the finishing temperature is 870°C, Rm is lower, 655MPa, Rp0.2 is 415MPa, but the elongation that is 26.98% is higher.

Wang Xiaodong

Papers

Study on Rolling Process and Fatigue Performance of Hot Rolled High Strength Steel for Wheel