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The influence of thermo-mechanical cycling on the microstructure and strength in the weld coarse-grained heat affected zone (CGHAZ) of Ti-Nb added low carbon HSLA steel was explored through Vickers hardnesstests, nanoindentation experiments, scanning electron microscopy (SEM) and transmission electron microscopy(TEM) analysis. Undeformed and deformed CGHAZs were simulated using Gleeble simulator with different heat inputs of 30kJ/cm and 300kJ/cm. At high heat input of 300kJ/cm, the CGHAZ consisted of ferrite and pearlite and then their grain sizes were not affected by deformation. At low heat input of 30kJ/cm, the CGHAZ consisted of lath martensite and then the sizes of prior austenite grain, packet and lath width decreased with deformation. In addition, the fraction of particle increased with deformation and this is becausethe precipitation kinetics was accelerated by deformation. Meanwhile, the Vickers and nanoindentation hardnessof deformed CGHAZ with 30kJ/cm heat input were higher than those of undeformed CGHAZ, which are due to the effect of grain refinement and precipitation strengthening.Key Words : Thermo-mechanical cycling, Coarse Grained Heat-Affected Zone (CGHAZ), Lath marteniste, Deformation, Heat Input

journal of korean welding and joining/daehan yongjeob haghoeji

Microstructure Evolution and Its Effect on Strength during Thermo-mechanical Cycling in the Weld Coarse-grained Heat-affected Zone of Ti-Nb Added HSLA Steel