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

• Autorzy: Majerski Krzysztof , Siemionek Ewa , Szucki Michał , Surdacki Piotr

Identyfikatory

DOI

10.12913/22998624/174932

• Języki publikacji: EN

Abstrakty

EN

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 homogenized at: 385°C, 400°C, 415°C and 430°C with argon as a shielding gas for 24 hours and then quenched. Subsequently 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 microhardness 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.

Słowa kluczowe

EN

cast magnesium alloys; AZ91 alloy; heat treatment; microstructure; formability

• Wydawca: Lublin University of Technology ; Polish Society of Ecological Engineering (PTIE), Branch of PTIE in Lublin
• Czasopismo: Advances in Science and Technology. Research Journal
• Rocznik: 2024
• Tom: Vol. 18, no 1
• Strony: 1--9
• Opis fizyczny: Bibliogr. 21 poz., fig., tab.

Twórcy

autor

Majerski Krzysztof

• Lublin University of Technology

• https://orcid.org/0000-0001-6791-1931

autor

Siemionek Ewa

• Lublin University of Technology

• https://orcid.org/0000-0003-4415-7379

autor

Szucki Michał

• Technische Universität Bergakademie, Freiberg Sachsen, Germany

• https://orcid.org/0000-0002-2675-1836

autor

Surdacki Piotr

• Lublin University of Technology

• https://orcid.org/0000-0001-8592-0321

Bibliografia

• 1. Avedesian MM, Baker H, ASM International. Handbook Committee. Magnesium and magnesium alloys. 1999; 314.
• 2. Zagórski I. Safety in Rough Milling of Magnesium Alloys Using Tools with Variable Cutting Edge Geometry. Adv. Sci. Technol. Res. J. 2023; 17:181–191.
• 3. Powell BR, Krajewski PE, Luo AA. Magnesium alloys for lightweight powertrains and automotive structures. Mater. Des. Manuf. Light. Veh. 2020; 125–186.
• 4. Luo AA. Magnesium casting technology for structural applications. J. Magnes. Alloy. 2013;1.
• 5. Song GL. Corrosion behavior of magnesium alloys and protection techniques. Surf. Eng. Light Alloy. Alum. Magnes. Titan. Alloy. 2010; 3–39.
• 6. Nie JF. Alloys: Magnesium. Ref. Modul. Mater. Sci. Mater. Eng. 2022;
• 7. Jonda E, Szala M, Sroka M, Łatka L, Walczak M. Investigations of cavitation erosion and wear resistance of cermet coatings manufactured by HVOF spraying. Appl. Surf. Sci. 2023;608.
• 8. Song GL, Shi Z. 9 - Anodization and corrosion of magnesium (Mg) alloys BT - Corrosion Prevention of Magnesium Alloys. Woodhead Publ. Ser. Met. Surf. Eng. 2013; 232–281.
• 9. Papenberg NP, Gneiger S, Weißensteiner I, Uggowitzer PJ, Pogatscher S. Mg-Alloys for Forging Applications—A Review. Mater. 2020, 13, 985.
• 10. Dziubińska A, Surdacki P, Majerski K. The Analysis of Deformability, Structure and Properties of AZ61 Cast Magnesium Alloy in a New Hammer Forging Process for Aircraft Mounts. Mater. 2021, Vol. 14, 2593.
• 11. Dziubinska A. Investigation of a New Screw Press Forming Process for Manufacturing Connectors from ZK60 Magnesium Alloy Preforms. Materials (Basel). 2023; 16.
• 12. Andrzej Kawalec OKE. Kształtowanie metali lekkich PWN; 2012
• 13. Ížek L, Greger M, Pawlica L, Dobrzaski LA, Taski T. Study of Selected Properties of Magnesium Alloy AZ91 after Heat Treatment and Forming. Journal of Materials Processing Technology. 2004. 157: 466-471.
• 14. XLVIII Rok T, Reguła T, Bronicki M, Lech-Grega M, Czekaj E. An assessment of the possibilities to shape the mechanical properties of cast az91 magnesium alloy through application of proper heat treatment. Prace instytutu odlewnictwa. 2008. XLVIII. 1.
• 15. Li JY, Xie JX, Jin JB, Wang ZX. Microstructural evolution of AZ91 magnesium alloy during extrusion and heat treatment. Trans. Nonferrous Met. Soc. China 2012; 22: 1028–1034.
• 16. Ziółkiewicz, S., Jankowski, Ł., & Gronowski, W. (2013). Kształtowanie odlewniczego stopu magnezu AZ91 na tle prób wyciskania współbieżnego. Obróbka Plastyczna Metali, 24(2), 109–117. 17. Pilehva F, Zarei-Hanzaki A, Fatemi-Varzaneh SM. The influence of initial microstructure and temperature on the deformation behavior of AZ91 magnesium alloy. Mater. Des. 2012; 42: 411–417.
• 18. Tan M, Liu Z, Quan G. Effects of Hot Extrusion and Heat Treatment on Mechanical Properties and Microstructures of AZ91 Magnesium Alloy. Energy Procedia 2012; 16: 457–460.
• 19. Thirumurugan M, Kumaran S. Extrusion and precipitation hardening behavior of AZ91 magnesium alloy. Trans. Nonferrous Met. Soc. China 2013; 23: 1595–1601.
• 20. Liu C, Liang J, Zhou J, Li Q, Peng Z, Wang L. Characterization and corrosion behavior of plasma electrolytic oxidation coated AZ91-T6 magnesium alloy. Surf. Coatings Technol. 2016; 304: 179–187.
• 21. Dziubińska A, Surdacki P, Majerski K. The analysis of deformability, structure and properties of az61 cast magnesium alloy in a new hammer forging process for aircraft mounts. Materials (Basel). 2021; 14.

Uwagi

Opracowanie rekordu ze środków MNiSW, umowa nr SONP/SP/546092/2022 w ramach programu "Społeczna odpowiedzialność nauki" - moduł: Popularyzacja nauki i promocja sportu (2024).