Abstract
The coarsening behavior of Ti (CxN1-x) particles in CGHAZ for Ti-microalloyed steel has been studied after different welding thermal cycles corresponding to heat inputs 30, 60, 100kJ/cm using Gleeble-3800 thermo/mechanical simulator and transmission electron microscopy. Cuboid TiN and a lot of ellipsoidal or elongated particles VC, M3C and M23C6 are observed in the base metal. After welding thermal cycle with peak temperature of 1350°C, irregular particles existed in base metal have also been dissolved even at the lowest heat input of 30kJ/cm. TiN Particles coarsening are observed in CGHAZ with the increase of heat inputs that is just related to dissolution and reprecipitation of particles and irrelevant to isothermal growth of particles. Keywords: microalloyed steel; coarse grain heat-affected zone; TiN particles
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