ФІЗИКО-ХІМІЧНІ МЕТОДИ ПІДВИЩЕННЯ ТРІЩИНОСТІЙКОСТІ СПЛАВУ АМ4,5Кд (ВАЛ10). Повідомлення 1: ДОСВІД ВИКОРИСТАННЯ КІЛЬЦЕВОЇ ПРОБИ: Procesi littâ, 2023, Vol 2 (152), 24-32

• Дата: 2023
• Автори: Бєлік, В. І., Пригунова, А. Г., Шейгам, В. Ю., Вернидуб, А. Г.
• Формат: Стаття
• Мова: Ukrainian
• Опубліковано: National Academy of Sciences of Ukraine, Physical-Technological Institute of Metals and Alloys of NAS of Ukraine 2023
• Теми: тріщиностійкість; кільцева проба; воднева обробка розплаву; сплав АМ4,5Кд
• Онлайн доступ: https://plit-periodical.org.ua/index.php/plit/article/view/62
• Назва журналу: Casting Processes

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.   References Novikov I. I. Hot brittleness of non-ferrous metals and alloys. Moskva: Nauka, 1966. 300 p. [in Russian]. Kotlyarsky F. M., Belik V. I. Influence of hydrogen on the formation of castings from aluminum alloys. Modern technological processes for obtaining high-quality products by casting and powder metallurgy. Cheboksary: CHTSNTI, 1989. Р. 37–38 [in Russian]. Kotlyarsky F. M., Belik V. I. Quality control of silumin castings by melt processing. Modern technological processes and equipment for casting into metal molds. Part 1. Moskva: PNIIinformation, 1989. Р. 41–42 [in Russian]. Kotlyarsky F.M., Borisov G.P., Belik V.I. On the positive role of hydrogen in the formation and quality of the casting/ Diffusion-cooperative phenomena in metal-hydrogen isotope systems. Donetsk: DPI, 1992. Р. 40–41 [in Russian]. Kotlyarsky F. M., Borisov G. P., Belik V I. Formation and quality of castings from gas-saturated aluminum alloys. Metal and casting of Ukraine, 1994. No. 9-10. With. Р. 31–33 [in Russian]. Belik V.I., Kotlyarsky F.M., Borisov G.P., Sheigam V.Yu., Semenchenko A.I., Duka V.M. Selection of a cast billet for studying the strength properties of aluminum alloys. Сasting processes. 2009. No. 2. Р.17–24 [in Russian]. Gudchenko A.P. Formation of gas porosity in castings from aluminum-silicon alloys. Questions of foundry technology. Moskva: Oborongiz, 1961. Proceedings of MATI. Issue 49. P.120–135. Shevtsov I.V., Shevtsova G.B., Elagin V.I., Kolachev B.A. Influence of hydrogen on the structure and mechanical properties of ingots from AK-8 alloy. Gases in light metaadds. Moskva: Metallurgy, 1970. Proceedings of MATI. Issue. 71. S. 67–74. Berg P.P., Glotov E.B. Tightness of castings from AL9 alloy. Foundry, 1967. No. 3. P. 26–28. Murphy A.J. Melting and casting of non-ferrous metals and alloys. Moskva: State. Scientific those. publishing house in black. and color. metallurg., 1959. 646 p. [in Russian]. Gruzleski J.E., Thomas P.M., Entwistle R.A. Au experimental study of the distribution of microporositi in cast aluminum base alloys. British Foundryman. 1978. 71. P. 69–78.