MC型碳化物的稳态/非稳态凝固转化机制  

Steady and non-steady-state solidification mechanism of MC carbide

作　　者：陈瑶[1] 王华明[1] 

机构地区：[1]北京航空航天大学材料学院激光材料加工与表面工程实验室,北京100083

出　　处：《中国有色金属学报》2002年第2期305-308,共4页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目 (5 99710 0 3 )

摘　　要：分析了平衡凝固MC碳化物规则块状八面体稳态生长的条件及影响MC碳化物稳态生长的因素。结果表明 :凝固过程中局部冷却速度的改变以及熔体中局部热流方向的扰动 ,都将影响熔体中MC碳化物形成元素的扩散 ,导致MC碳化物偏离稳态生长条件 。The solidification conditions for forming regular octahedral MC carbide under equilibrium solidification conditions were studied, and the influencing factor to steady and non steady state growth mechanism were discussed. Results indicate that solidification cooling rate and disturbance of local heat flow in the melt strongly affect the diffusion of MC carbide forming elements, leading to the departure of MC carbide from stable growth, and the diversification of MC carbide growth morphology.

关 键 词：MC型碳化物 稳态/非稳态生长 凝固机制 

分 类 号：TG111.4[金属学及工艺—物理冶金]