Effect of Plastic Deformation in Various Temperature-Rate Conditions on Structure and Mechanical Properties of Biodegradable Fe–30Mn–5Si Alloy

• Published in: Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2024-03, Vol.55 (3), p.895-909
• Main Authors: Kadirov, P., Zhukova, Y., Pustov, Y., Karavaeva, M., Sheremetyev, V., Korotitskiy, A., Shcherbakova, E., Baranova, A., Komarov, V., Prokoshkin, S.
• Format: Article
• Language: English
• Subjects: Characterization and Evaluation of Materials; Chemistry and Materials Science; Deformation; Deformation effects; Diamond pyramid hardness; Dynamic recrystallization; High resistance; Martensite; Martensitic transformations; Materials Science; Mechanical properties; Metallic Materials; Nanotechnology; Original Research Article; Parameters; Plastic deformation; Rheological properties; Room temperature; Shape memory alloys; Silicon base alloys; Strain rate; Stress-strain curves; Stress-strain relationships; Structural Materials; Surfaces and Interfaces; Thermomechanical treatment; Thin Films; Yield stress
• ISSN: 1073-5623; 1543-1940
• DOI: 10.1007/s11661-023-07293-5

Rheological models of deformation behavior and structure formation of biodegradable Fe–30Mn–5Si shape memory alloy (wt pct) under various upsetting conditions from 250 °C to 900 °C with strain rates of 0.1, 1, and 10 s −1 are studied. The relationship between the structure formation and the shape of compression stress–strain diagrams has been established. The main parameters of compression stress–strain diagrams, such as maximum stress ( σ max ), apparent yield stress ( σ 0,2 ), and maximum strain ( e max ) achieved at σ max are determined. The Vickers hardness was also measured. These parameters were found to be depending on the deformation temperature at a greater extent and, at a lesser extent, on the strain rate. According to optical and electron microscopy, the Fe–30Mn–5Si alloy exhibits high resistance to dynamic recrystallization process up to 900 °C. It has been shown by X-ray diffraction that the Fe–30Mn–5Si alloy is in a single-phase state ( γ -austenite) in the temperature range from 250 °C to 700 °C. An increase in the deformation temperature leads to the appearance of a ε- martensite phase at room temperature. Based on the obtained results, favorable modes of subsequent thermomechanical treatment have been developed. These modes make it possible to obtain semi-products with high functional properties from the Fe–30Mn–Si alloy.