Designed for learners in mechanical and materials engineering, this course provides an in-depth study of strain ageing mechanisms and dislocation-based strengthening in steels. Learners will examine the atomic-scale interactions between interstitial solutes and dislocations, explore dynamic strain ageing through the Cottrell-Bilby theory, and assess mechanical property transformations caused by thermal and mechanical processing. Through simulations, analytical equations, and interpretation of experimental data, participants engage with topics including Lüders bands, the Holloman and Taylor models, work hardening, and dislocation network behavior. This course forms a critical part of metallurgy pathways and equips learners with applied knowledge in steel deformation, strengthening, and evaluation methods.