Strengthening Mechanism and Mechanical Behavior of Low Carbon Microalloyed Steel Containing Ti

Microstructure and strengthening mechanism of low carbon micro-alloyed steel with different contents of titanium were characterized by OM and SEM analysis and tensile and impact testing.With the increase of titanium content,the strength and yield ratio of the tested steel increased,while the elongation decreased.When the titanium content increased from 0.016% to 0.137%,the yield strength increased from 327 to 710 MPa,increasing by 383 MPa,while the tensile strength increased from 418 to 773 MPa,increasing by 355 MPa.When the effective titanium content in the ranges of 0 ～ 0.052% and 0.052% ～ 0.107%,the increments of yield strength for each 0.01% of effective titanium content are roughly 44 MPa and 21 MPa,respectively.