摘要
采用倾斜板冷却体法对亚共晶高铬铸铁进行半固态成形,研究了倾斜板角度对亚共晶高铬铸铁半固态组织的影响规律。结果表明:倾斜板角度过大或过小都将使得组织中的初生奥氏体较粗大、圆整度较小。当倾斜板角度较小时,金属液的流速相对较慢,枝晶与枝晶和枝晶与金属液间的冲刷、碰撞、剪切作用较小,晶粒易于长大,导致枝晶状初生奥氏体比较多。当倾斜板角度较大时,金属液流速相对较快,金属液在倾斜板上流动的时间相对较短,枝晶间以及枝晶与金属液间的冲刷、碰撞、剪切作用时间相对较短,导致枝晶状初生奥氏体也比较多。当倾斜板角度为45°时,制备的亚共晶高铬铸铁初生奥氏体的尺寸最小,圆整度最高。
Effects of inclined angle on semi-solid microstructure of hypoeutectic high Cr cast iron prepared by inclined plate cooling method were investigated. The results show that the bigger or smaller inclined angle can cause the occurrence of coarse primary austenite crystal with low spheroidalization. Coarse primary austenite phase in dendrite is attributed to slower flow velocity of the liquid metal resulting in the full growth of primary phase companying with low scouring, impacting and shearing between dendrite and dendrite or dendrite and liquid metal with low inclined angle, while with high inclined angle, coarse dendrite austenite occurs due to faster flow velocity resulting in shortening flow time on inclined plate and shortening acting time of scouring, impacting and shearing in dendrites and between dendrite and liquid metal. Primary austenite phase in prepared hypoeutectic high Cr cast iron possesses the finest grain size and best speroidalization with inclined angle of 45°.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2006年第3期159-161,共3页
Special Casting & Nonferrous Alloys
基金
云南省自然科学基金资助项目(2004E0018M)
关键词
倾斜板角度
冷却体法
亚共晶高铬铸铁
初生奥氏体
Inclined Angle, Cooling-body Method, Hypoeutectic High Cr Cast Iron, Primary Austenite
