(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)
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，从而使其生长形态多样化。
关键字: 碳化物；稳态/非稳态生长；凝固机制
solidification mechanism
of MC carbide
（Laboratory of Laser Materials Processing and Surface Engineering，
School of Materials，Beijing University of Aeronautics and
Astronautics，Beijing 100083, China）
Abstract: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.
Key words: carbide；steady and non-steady-state growth； solidification mechanism
