Investigations of the Effect of Heat Treatment and Plastic Deformation Parameters on the Formability and Microstructure of AZ91 Alloy Castings

Krzysztof Majerski, Ewa Siemionek, M. Szucki, Piotr Surdacki
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Abstract

The article discusses the influence of heat treatment and metal forming parameters on formability and the structure of the AZ91 cast magnesium alloy. The aim of the article is to determine the optimal parameters of homogenization and plastic deformation of sand castings made of the AZ91 alloy in order to improve their properties and structure. In this study, sand castings made from the AZ91 alloy were examined. In the first stage, the castings were homog - enized at: 385 °C, 400 °C, 415 °C and 430 °C with argon as a shielding gas for 24 hours and then quenched. Sub-sequently the upsetting tests were conducted at 380 ° C; 400 ° C; 420 ° C; 440 ° C for two deformation values: ε = 0.7 and ε = 1.1. After upsetting, the samples were water-and air-cooled. At this stage, a visual assessment was made and samples without cracks were subjected supersaturation at 415 ° C for 6 h, and artificial aging at 175 ° C for 24 h. Vickers hardness tests and microstructure assessment were carried out, at individual stages of testing. Based on the results obtained from the upsetting, structure and hardness tests, the most favorable homogenisation and plastic deformation conditions were determined for AZ91 alloy sand castings. The best results are achieved by homogenizing sand castings at 415 °C for 24 h. Among the tested parameters for conducting metal forming processing in the range of 380–440 °C and deformation values: ε = 0.7 and ε = 1.1, forging of sand-cast AZ91 magnesium alloy at 420 °C and deformation of ε = 0.7 with water cooling seems to be the most favourable. The final heat treatment applied after the deformation process consists of supersaturation at 415 °C for 6 hours water quenching as artificial aging at 175 °C for 24. This combination of heat and plastic treatment parameters of castings allows for improvement of the structure and properties of sand castings made of the AZ91 alloy.
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热处理和塑性变形参数对 AZ91 合金铸件成型性和显微组织的影响研究
文章讨论了热处理和金属成型参数对 AZ91 铸造镁合金成型性和结构的影响。文章的目的是确定 AZ91 合金砂型铸件均匀化和塑性变形的最佳参数,以改善其性能和结构。本研究对 AZ91 合金制成的砂型铸件进行了检验。在第一阶段,铸件在以下温度下均化:385°C、400°C、415°C 和 430°C,以氩气作为保护气体,持续 24 小时,然后进行淬火。随后在 380 ° C、400 ° C、420 ° C 和 440 ° C 下进行镦粗试验,变形值分别为 ε = 0.7 和 ε = 1.1。镦粗后,对样品进行水冷和空冷。在此阶段,对样品进行目测评估,并将无裂纹的样品在 415 ° C 的温度下过饱和 6 小时,在 175 ° C 的温度下人工老化 24 小时。根据镦粗试验、结构试验和硬度试验的结果,确定了 AZ91 合金砂型铸件最有利的均匀化和塑性变形条件。在 380-440 °C范围内进行金属成型加工的测试参数和变形值:ε = 0.7 和 ε = 1.1 中,在 420 °C、ε = 0.7 和水冷条件下锻造砂铸 AZ91 镁合金似乎是最有利的。变形过程后的最终热处理包括在 415 ℃ 下过饱和 6 小时,在 175 ℃ 下人工时效 24 小时的水淬。将铸件的热处理和塑性处理参数相结合,可以改善 AZ91 合金砂型铸件的结构和性能。
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