提高AM4.5Cd (VAL10)合金抗裂性能的物理化学方法。注意事项1:使用环形样品的经验

V. Bielik, A. Prigunova, V. Shaіgam, A. Vernydub
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引用次数: 1

摘要

以液态氢处理的AM4.5Kd(VAL10)合金为例,研究了利用众所周知的环试验研究影响宽范围铝合金抗裂性的物理化学方法的效率,这些合金在凝固过程中容易形成热裂纹。为了实现这一目标,根据推荐的尺寸制作了一个环形模具,并对熔体的氢处理对铸件抗裂性的影响进行了实验。氢气饱和是通过用水蒸气吹制熔体来进行的,气体饱和程度是根据铸件的孔隙率来估计的,与在具有足够功率的模具中获得的对照样品相比,根据铸件密度的变化来计算。尽管采取了措施来提高环形样品的灵敏度并获得稳定的结果,包括调整模具的尺寸,特别是中心棒的尺寸,在压缩过程中,硬化熔体产生拉伸应力,导致热裂纹的形成,以及通过将初始模具温度从22 0С提高到217-249 0С来优化获得铸件的热状态,该样品在实验条件下的灵敏度仍然过低。在60%的情况下,当在室温下使用模具时,熔体的气体饱和度有助于减少裂纹扩展过程,当模具加热到228 0C至260 0C的温度时,气体饱和度高达100%。然而,在第一种和第二种情况下,28%的类似数据是从未被氢气饱和的初始熔体中获得的。这使人们对氢处理的积极作用的可靠性产生了怀疑,并成为结论的基础,即为了提高AM4.5Kd(VAL10)合金的抗裂性,在研究熔体的物理和化学作用时使用这种类型的样品是不合适的,并决定是否需要开发一个没有已发现缺陷的新样本。
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PHYSICO-CHEMICAL METHODS OF INCREASING THE CRACK RESISTANCE OF ALLOY AM4.5Cd (VAL10). NOTICE 1: EXPERIENCE OF USING AN RING SAMPLE
On the example of the AM4.5Kd (VAL10) alloy treated in the liquid state with hydrogen, the efficiency of using the well-known ring test for the study of physicochemical methods of influencing the crack resistance of wide-range aluminum alloys, which are prone to the formation of hot cracks during solidification, was studied. To achieve this goal, an annular mold mold was made according to the recommended dimensions, experiments were carried out on the effect of hydrogen treatment of the melt on the crack resistance of castings. Saturation with hydrogen was carried out by blowing the melt with water vapor, the degree of gas saturation was estimated from the porosity of the castings, calculated from the change in their density compared to the control sample obtained in a mold with sufficient power. Despite the measures taken to increase the sensitivity of the annular sample and obtain stable results, which consisted in adjusting the dimensions of the mold, in particular, the size of the central rod, during compression of which the hardening melt creates tensile stresses leading to the formation of a hot crack, as well as optimizing the thermal regime for obtaining a casting by increasing the initial mold temperature from 22 0С to 217-249 0С, the sensitivity of this sample under the experimental conditions remained too low. In 60 % of cases, gas saturation of the melt contributed to a reduction in the crack propagation process when using a mold at room temperature and up to 100 % when the mold was heated to a temperature of 228 0C to 260 0C. However, in both the first and second cases, 28 % of similar data were obtained on castings from the initial melt not saturated with hydrogen. This casts doubt on the reliability of the positive effect of hydrogen treatment and became the basis for the conclusion that it is inappropriate to use this type of sample in studies of physical and chemical effects on the melt in order to increase the crack resistance of the AM4.5Kd (VAL10) alloy due to a possible error in assessing the effectiveness of their impact, and also to decide on the need to develop a new sample, devoid of the identified shortcomings.
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