<p>A series of high-strength wind power steels with various microstructural morphologies was produced by hot-rolled and thermo-mechanical controlled processes. The microstructure, microhardness, and tensile behavior observed using in-situ techniques in various types of steels were investigated. The experimental results demonstrated that the 3 microstructural morphologies (band-, net-, and fiber-structures) can be clarified and categorized; each type possesses different tensile strengths, yield behaviors, and strain hardening behaviors. This can be attributed to different strain distribution caused by the structural morphology; band-structure steels exhibit a yield plateau primarily attributed to the relatively weak constraint effect of pearlite on ferrite; net-structure steels display 3 strain hardening stages due to the staged plastic deformation; fiber-structure steels achieve superior strength through their uniform stress distribution. Furthermore, the initial strain hardening rate, transition strain, and uniform elongation were influenced by the features of the constituent phases. Based on these findings, methods for estimating the yield strength and tensile strength of the steels with two phases were discussed and experimentally validated.</p>