分流桥对多腔体铝型材挤压融合口断口性能的影响

Effect of Diversion Bridge on the Fracture Performance of Extrusion Fusion Joint of Multi Cavity Aluminum Profile

对融合口断口位置进行化学成分分析、金相组织观察以及力学性能检测,研究表明铸锭在较大挤压力的作用下与分流桥产生摩擦力,较大的摩擦力使得铸锭表面晶粒破碎严重,在后期热处理过程中晶粒长大形成粗大再结晶,导致融合区域断口呈大颗粒状。大颗粒状形态的晶粒会降低融合口位置的力学性能,在实际生产过程中应予以严格控制。

The chemical composition analysis,metallographic observation and mechanical property of the fusion joint fracture location was carried out.The research showed that under the action of large extrusion pressure,the ingot generated frictional force with the diversion bridge.The large friction force caused serious grain breakage on the surface of the ingot.In the process of later heat treatment,the grains grew and formed coarse recrystallization,resulting in large particle morphology of the fracture in the fusion area.The large granular grains would reduce the mechanical properties of the fusion location,which should be strictly controlled in the actual production process.