THE EFFECT OF THE VOLUME OF INCLUSIONS ON THE FATIGUE STRENGTH COEFFICIENT OF STRUCTURAL STEEL
The influence of impurities on fatigue strength has been researched extensively, but very few studies analyze the effect of impurities on the coefficient given by equation (1) which is used to estimate fatigue strength (zgo)based on Vickers hardness (HV), i.e. in non-destructive tests. Coefficient k is the quotient of fatigue strength zg divided by Vickers hardness HV.
The article discusses the results of a study investigating the effect of the percentage volume of non-metallic inclusions on the fatigue strength coefficient of structural steel during rotary bending. The study was performed on heats produced in an industrial plant. Fourteen heats were produced in an electric furnaces and oxygen converter. All heats were desulfurized. A half of heats from electrical furnaces were refined with argon, and heats from the converter were subjected to vacuum circulation degassing.Steel were hardened and tempered at different temperatures. The results were presented graphically, and the fatigue strength coefficient of steel with a varied share of non-metallic inclusions was determined during rotary bending. The results revealed that fatigue strength coefficient is determined by the percentage volume of non-metallic inclusions and tempering temperature.
Keyword(s): Steel, structural steel, non-metallic inclusions, fatigue strength, fatigue strength coefficient, bending fatigue, bending pendulum
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