Effect of tool shape on surface modification of AC4C aluminum alloy castings applied FSW phenomenon
Effect of tool shape on surface modification of AC4C aluminum alloy castings applied FSW phenomenon
复制标题
工具形状对AC4C铝合金铸件FSW现象表面改性的影响
DOI：
10.2464/jilm.53.405
复制
发表时间：
2003
期刊：
影响因子：
--
通讯作者：
T. Shinoda
中科院分区：
文献类型：
--
作者：
M. Kawai;T. Shinoda
铝合金铸件已广泛用于汽车零部件。然而，它们遭受一些缺陷，如孔隙率，偏析和其他。熔融工艺用于表面局部改性，导致改性区的二次缺陷，如孔隙和开裂。本研究开发了一种利用搅拌摩擦焊现象对铸造铝合金表面进行大面积平整改性的新工艺。这一过程被称为摩擦热机械过程（以下简称FTMP）。这一种被归类为固态工艺，不需要额外的填充材料。在FTMP过程中，由于动态再结晶作用，铸态合金表面粗大的组织不断细化。铸件中的缺陷在2mm深的表面区域中被消除。通过使用偏置销钉工具，变质区域极大地扩展，从而增强了搅拌金属。
Aluminum alloy castings have been widely used for auto parts. However they suffer from some defects such as porosity, segregation and others. Fusion processes used to modify the surface locally, lead to secondary defects like porosity and cracking in modified zone. In this research, a new surface modification process, which utilizes FSW phenomenon, is developed for modifying the large and flat surface layer of cast aluminum alloy. It is named as Friction Thermomechanical Process (hereafter referred as FTMP). This one is categorized as solid-state process and required no additional filler materials. The coarse microstructure in as-cast alloy surface is continuously refined due to dynamic recrystallization during FTMP. Defects in the cast are eliminated in the surface zone of 2 mm in depth. Modification area is extremely extended by use of offset pined tool, resulting in enhanced stirring metals.