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In order to study the effects of inclusions containing titanium,zirconium and magnesium on the impact toughness of heat affected zone (HAZ) of steel,two low carbon steels deoxidized by titanium,zirconium and magnesium were obtained.After some treatments,the inclusion characteristics (size,morphology and chemistry) analysis,Charpy-type test,microstructure and the fracture observation were carried out on the prepared specimens.The following results were found.The inclusions containing Mg can keep more stable in HAZ.The inclusion containing Mg can enhance the impact toughness of HAZ,and the impacting energy reaches 249J at 253K when simulated input energy is 150kJ/mm.The inclusions with diameter smaller than 1.5 μm play a key role of pinning effect.
In order to study the effects of inclusions containing titanium, zirconium and magnesium on the impact toughness of heat affected zone (HAZ) of steel, two low carbon steels deoxidized by titanium, zirconium and magnesium were obtained. After some treatments, the inclusion characteristics size, morphology and chemistry) analysis, Charpy-type test, microstructure and the fracture observation were carried out on the prepared specimens. The following findings were found. inclusions containing Mg can keep more stable in HAZ. The inclusion containing Mg can enhance the impact toughness of HAZ, and the impacting energy reaches 249J at 253K when simulated input energy is 150kJ / mm. inclusions with diameter smaller than 1.5 μm play a key role of pinning effect.