The modification effect of CX-type (CX means the modifiers that have longeffective term) modifiers applied in ZL108 and ZL104 Al-Si alloys has been studied in detail. Theresults show that the morphologies of the eutec...The modification effect of CX-type (CX means the modifiers that have longeffective term) modifiers applied in ZL108 and ZL104 Al-Si alloys has been studied in detail. Theresults show that the morphologies of the eutectic silicon and the primary silicon can be modifiedand refined simultaneously. The modification effect acts quickly and can maintain a period of 8 h bythe CX-type modifiers. The CX-type modifiers increase the mechanical properties of Al-Si alloys andimprove the service properties of machine parts made of Al-Si alloys (such as piston and cylinderetc.). In modifying processes, the amount of the addition of CX-type modifiers is smaller than thatof any other modifiers, and the modifying procedures are simple. There are no smoke, no dust, and noirritant smell in modifying processes using CX-type modifiers. Therefore, the CX-type modifiershave advantages in economy and environment protection.展开更多
Laboratory study was carried out on deep dephosphorization of liquid steel byBaO-based fluxes at 1600°C to achieve ultra low phosphorus level in the steel. A dynamic model ofdephosphorization of Liquid steel by B...Laboratory study was carried out on deep dephosphorization of liquid steel byBaO-based fluxes at 1600°C to achieve ultra low phosphorus level in the steel. A dynamic model ofdephosphorization of Liquid steel by BaO-based fluxes was established. According to the model, thecontrolling step of dephosphorization by BaO-based fluxes was the mass-transfer of phosphorus insteel phase under the condition of low phosphorus liquid steel. It is estimated that the apparentrate constant of dephosphorization by BaO-based fluxes was 0.4xl0^(-3)-8.2xl0^(-3) g/(cm^2 centre tos) and the mass-transfer coefficient of phosphorus in bulk steel was 0.025-0.04 cm/s.展开更多
基金This work was supported by National Natural Science Foundation of China (No.59771011).
文摘The modification effect of CX-type (CX means the modifiers that have longeffective term) modifiers applied in ZL108 and ZL104 Al-Si alloys has been studied in detail. Theresults show that the morphologies of the eutectic silicon and the primary silicon can be modifiedand refined simultaneously. The modification effect acts quickly and can maintain a period of 8 h bythe CX-type modifiers. The CX-type modifiers increase the mechanical properties of Al-Si alloys andimprove the service properties of machine parts made of Al-Si alloys (such as piston and cylinderetc.). In modifying processes, the amount of the addition of CX-type modifiers is smaller than thatof any other modifiers, and the modifying procedures are simple. There are no smoke, no dust, and noirritant smell in modifying processes using CX-type modifiers. Therefore, the CX-type modifiershave advantages in economy and environment protection.
文摘Laboratory study was carried out on deep dephosphorization of liquid steel byBaO-based fluxes at 1600°C to achieve ultra low phosphorus level in the steel. A dynamic model ofdephosphorization of Liquid steel by BaO-based fluxes was established. According to the model, thecontrolling step of dephosphorization by BaO-based fluxes was the mass-transfer of phosphorus insteel phase under the condition of low phosphorus liquid steel. It is estimated that the apparentrate constant of dephosphorization by BaO-based fluxes was 0.4xl0^(-3)-8.2xl0^(-3) g/(cm^2 centre tos) and the mass-transfer coefficient of phosphorus in bulk steel was 0.025-0.04 cm/s.
