By using carbon extraction replica technology and welding therma l simulation, the second phase particles in parent metal,weld metal and simulate d CGHAZ of Ti-Nb-V microalloyed steel were investigated. Experiment results and analysis show that the particles in the steel are less than 100 nm, irregular in shape , and have a slight size-dependence in that the relative content of Ti in crease with the increase of particle size. A large quantity of carbonnitride par ticles are still in CGHAZ after welding cycl...
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