(北京航空航天大學 材料學院 激光材料加工與表面工程實驗室，
北京 100083)
摘 要: 分析了平衡凝固MC碳化物規(guī)則塊狀八面體穩(wěn)態(tài)生長的條件及影響MC碳化物穩(wěn)態(tài)生長的因素。結果表明：凝固過程中局部冷卻速度的改變以及熔體中局部熱流方向的擾動，都將影響熔體中MC碳化物形成元素的擴散，導致MC碳化物偏離穩(wěn)態(tài)生長條件，從而使其生長形態(tài)多樣化。
關鍵字: 碳化物；穩(wěn)態(tài)/非穩(wěn)態(tài)生長；凝固機制
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
