CAJ | 학술논문

采用Lasertec 1LMH21共焦扫描激光显微镜和光学显微镜,观察了Al-TI-C晶粒细化剂在加热熔化过程中的组织变化与凝固后的组织.结果发现,在加热过程中,Al-Ti-C细化剂中Al基体首先熔化,随后片状TiAl_3和TiC相成为游离相,然后被熔断、破碎成细小的新质点,其破碎程度随着保温时间的延长与熔化温度的升高而加剧.重熔工艺可有效改善TiAl_3和TiC晶粒的形貌,低温对TiAl_3相的形貌影响较大,高温对TiC相的形貌影响较大.
채용Lasertec 1LMH21공초소묘격광현미경화광학현미경,관찰료Al-TI-C정립세화제재가열용화과정중적조직변화여응고후적조직.결과발현,재가열과정중,Al-Ti-C세화제중Al기체수선용화,수후편상TiAl_3화TiC상성위유리상,연후피용단、파쇄성세소적신질점,기파쇄정도수착보온시간적연장여용화온도적승고이가극.중용공예가유효개선TiAl_3화TiC정립적형모,저온대TiAl_3상적형모영향교대,고온대TiC상적형모영향교대.
Microstructure evolution of Al-Ti-C refiner during melting and solidification process was observed by the Lasertec 1LMH21 confocal scanning laser microscope and optical microscope(OM). The results indicate that during melting process,Al matrix is-firstly melted in Al-Ti-C refiner, and then lamellar TiAl_3 phase and TiC phase becomes free phase in liquid aluminum, finally the TiAl_3 phase is broken into fine particles, meanwhile, with increasing in holding time and in melting temperature, the broken degree is enhanced. The grain morphology of TiAl_3 and TiC phase is effectively improved by re-melting process at 700～800 ℃.With remelting temperature more than 800℃,TiAl_3 particles are coarsened to fail to refining, while TiC phase with desirable size can be obtained at a higher re-melting temperature with a subsequently rapidl solidification.