Effect of Mg on Inclusion and High Cycle Fatigue Behavior in Titanium Microalloyed Beam Steel

In this paper, the fatigue behavior of titanium microalloyed beam steels were studied by high cycle test and crack growth rate test. The effect Mg addition on in steel was systematically analyzed. According to experimental results, magnesium can effectively modify inclusions reducing size Al2O3 TiN promoting formation finer complex with a MgO·Al2O3 core high-strength steel. number had far less an impact characteristic than inclusion size. With heterogeneous nucleation MgO·Al2O3, are refined after addition. tensile strength Beam-2 decreased approximately 54 MPa, while its increased about 33 showing favorable resistance. These findings essential for optimize properties microalloy development automobile excellent properties.