Kazakova Alena A, Churyumov Alexander Yu
Department of Physical Metallurgy of Non-Ferrous Metals, National University of Science and Technology MISIS, Leninskiy Prospekt 4, 119049 Moscow, Russia.
Materials (Basel). 2025 Mar 12;18(6):1258. doi: 10.3390/ma18061258.
The development of new materials with low weight for the transport industry is required for the saving of natural resources and protection of the environment from carbon dioxide pollution. The microstructure and mechanical properties of the Fe-30Mn-10Al-3.3Si-1C steel in as-cast, quenched, aged, and hot-deformed states were investigated. Austenite, ferrite, and κ-carbides are present in the steel in an as-cast state. Hot deformation of steels was made using the thermal and mechanical simulation system Gleeble-3800 at temperatures of 900-1050 °C and strain rates of 0.1-10 s. Mechanical properties in as-cast, annealed, aged, and hot-deformed states were determined by Vickers hardness and compression tests. A constitutive model of the hot deformation behavior of Fe-30Mn-10Al-3.3Si-1C steel with high accuracy (R = 0.995) was constructed. The finite element analysis of the deformation behavior of the steel under the plane-strain scheme was performed. Compression tests at room temperature have shown an increase in strength and ductility after hot deformation. The strain hardening of ferrite and austenite grain refinement during dynamic recrystallization are the main reasons for the growth of steel's plasticity and strength. A specific strength of the investigated material is in the range from 202,000 to 233,000 m/s which is higher than high-strength steels previously developed and used in the automotive industry.
为了节约自然资源并保护环境免受二氧化碳污染，运输行业需要开发轻质新材料。研究了Fe-30Mn-10Al-3.3Si-1C钢在铸态、淬火态、时效态和热变形态下的微观结构和力学性能。铸态钢中存在奥氏体、铁素体和κ碳化物。使用热机械模拟系统Gleeble-3800在900-1050°C的温度和0.1-10 s的应变速率下对钢进行热变形。通过维氏硬度和压缩试验测定铸态、退火态、时效态和热变形态下的力学性能。构建了具有高精度（R = 0.995）的Fe-30Mn-10Al-3.3Si-1C钢热变形行为本构模型。对平面应变方案下钢的变形行为进行了有限元分析。室温压缩试验表明，热变形后强度和延展性有所提高。铁素体的应变硬化和动态再结晶过程中奥氏体晶粒细化是钢的塑性和强度提高的主要原因。所研究材料的比强度在202,000至233,000 m/s范围内，高于先前开发并用于汽车行业的高强度钢。
