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本文研究了半固态铝合金的工艺参数和性能之间的关系,研究了半固态铝合金汽车零件的组织和性能与加工参数之间的关系,并与锻造零件和压铸零件做了比较。另外,研究了半固态成形浇道位置的变化对显微孔洞分布及机械性能的影响;对半固态零件进行T6处理,并以抗拉强度和耐磨性评估T6处理对机械性能的影响。 与压铸件相比,半固态成形铝合金件不存在明显的显微孔洞。对A319合金的T6热处理大大提高了合金的硬度和耐磨性,半固态成形的A319合金部件比A332-T4锻件的硬度稍高,而耐磨性差不多。观察了以上两种合金的摩擦性能,实验发现这两种合金的摩擦系数相近,低于0.5。总之,与压铸件相比,热处理强化的半固态铝合金铸件的性能大为改善,可与锻件相媲美;通过改变铸件浇道的位置可以明显改善微观组织和减少显微空洞。
This paper studies the relationship between process parameters and properties of semi-solid aluminum alloy, studies the relationship between microstructure and properties and processing parameters of semi-solid aluminum alloy automotive parts, and compares with forged parts and die-cast parts. In addition, the influence of position change of semi-solid forming runner on the distribution of microscopic holes and mechanical properties was studied. The semi-solid parts were treated with T6, and the effect of T6 treatment on mechanical properties was evaluated by tensile strength and wear resistance. Compared with die-casting, semi-solid aluminum alloy parts there is no obvious microscopic holes. The T6 heat treatment of A319 alloy greatly improves the hardness and wear resistance of the alloy. The semi-solid formed A319 alloy part has a slightly higher hardness than the A332-T4 forgings with similar wear resistance. The friction properties of the above two alloys were observed. The friction coefficient of these two alloys was found to be similar, lower than 0.5. In summary, heat-treated semi-solid aluminum alloy castings have significantly improved performance compared to die-castings, comparable to forgings; microstructures and microscopic cavities can be significantly improved by changing the position of the runner.