The pattern of dendritic growth and distortion of dendritic network in the platform have been investigated by one mold casting with different platform length during directional solidification. As the platform length elongates, the symmetry of dendritic growth along left and right edges gradually worsens in platform base. While the platform length reaches 14 mm, the distortion of dendritic network is first observed in outward platform. It is found that the distortion of dendritic network along platform inside is more serious than that along platform edges. Both[001] deviation and accumulated misorientation along platform inside, up to 9 and 16.3, respectively, are far greater than those along lefte outwarde right edges. The deformation of dendritic network in a platform may be caused by the asymmetry of the solidification front at the mush zone.
Xiaoli ZhangYizhou ZhouYanyun HanTao JinXiaofeng Sun
A kind of Ni-Cr-Fe-B-Si system amorphous alloy was used as interlayer in transient liquid-phase bonding(TLP bonding)of polycrystalline superalloy K465.The bonding behavior,microstructure feature and the tensile properties of the joints were investigated.There are B-rich phase and Si-rich phase formed in the center of the seam after bonding at 1210℃for 30 min.The isothermal solidification is complete after bonding at 1210℃for 4 h.The relationship of the average width of the remnant eutectic zone and bonding time at 1210℃is nonlinear.The tensile strength of the bonded joint at room temperature and 900℃is comparable to that of K465 alloy.
Ji-De LiuBo LiYuan SunTao JinXiao-Feng SunZhuang-Qi Hu
