摘要
In order to utilize the advantage of oxides in stainless steel,the formation of titanium nitride(TiN)and oxide(TixOy)in the 17Cr steel was investigated by the calculation of the free energy of reaction and thermodynamic calculation with Thermo-calc software.The result indicates that the competitive reaction between the dissolved [O] and the dissolved [N] with the dissolved [Ti] in molten steel results in different precipitation sequences of TiN and TixOy.The primary precipitation of TiN requires a low [O] and the primary precipitation of TixOy requires a low [N].The increase of [Ti] causes a higher precipitation temperature of TiN and TixOy in both Ti-N and Ti-O alloy systems.Equilibrium relations of [Ti] vs [N] and [Ti] vs [O] show that the solubility products fall with the decrease of the temperature,and then the precipitation of the inclusions becomes easier.In the Ti-O alloy system,a high [O] and a low [Ti] are favorable to the precipitation of Ti3O5,and a high [Ti] content and a low [O] favorable to the Ti2O3 precipitation.
In order to utilize the advantage of oxides in stainless steel,the formation of titanium nitride(TiN)and oxide(TixOy)in the 17Cr steel was investigated by the calculation of the free energy of reaction and thermodynamic calculation with Thermo-calc software.The result indicates that the competitive reaction between the dissolved [O] and the dissolved [N] with the dissolved [Ti] in molten steel results in different precipitation sequences of TiN and TixOy.The primary precipitation of TiN requires a low [O] and the primary precipitation of TixOy requires a low [N].The increase of [Ti] causes a higher precipitation temperature of TiN and TixOy in both Ti-N and Ti-O alloy systems.Equilibrium relations of [Ti] vs [N] and [Ti] vs [O] show that the solubility products fall with the decrease of the temperature,and then the precipitation of the inclusions becomes easier.In the Ti-O alloy system,a high [O] and a low [Ti] are favorable to the precipitation of Ti3O5,and a high [Ti] content and a low [O] favorable to the Ti2O3 precipitation.
作者
LIANG Jianping1,2),JIANG Laizhu1),ZHAI Ruiyin1),YU Haifeng1)and CHANG E1)1)Stainless Steel Technology Center,Research Institute,Baoshan Iron & Steel Co.,Ltd.,Shanghai 200431,China 2)School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China
