论文部分内容阅读
利用过冷度的遗传性 ,提出将合金熔体深过冷与传统定向凝固相结合的深过冷定向凝固 (SDS)技术 ,并在自制的实验装置上 ,对SDS技术进行了探索性研究 ,实现了Cu Ni合金的深过冷定向凝固 .结果表明 :( 1 )SDS技术获得的定向生长组织与LMC (GL=2 5K/mm ,V =5 0 0μm/s)法相当 ,且一次枝晶间距约为 30 μm ,二次分枝被抑制 ,一次枝晶主干挺直、细密 ,与试样轴向偏差约为 5 .8°;( 2 )建立了描述SDS过程过冷度与凝固速率之间的数学模型 ,即T T模型 ,利用此模型可以解释SDS试样上微观组织的演化情况
Based on the inheritance of subcooling degree, a deep supercooling directional solidification (SDS) technique combining deep subcooling of alloy melt with conventional directional solidification was proposed. On the homemade experimental device, the SDS technique was explored. Directional solidification of Cu Ni alloy was achieved.The results showed that: (1) The directional growth structure obtained by SDS was comparable to that of LMC (GL = 25K / mm, V = 500μm / s) The distance between the two branches was about 30 μm. The secondary branches were inhibited. The primary dendrites were straight and dense, with a deviation of about 5.8 ° from the axial direction of the samples. (2) A method was developed to describe the degree of undercooling and solidification Between the mathematical model, TT model, the use of this model can explain the microstructure evolution of SDS samples