Pokropek Jakub, Kluczyński Janusz, Sarzyński Bartłomiej, Jasik Katarzyna, Szachogłuchowicz Ireneusz, Łuszczek Jakub, Joska Zdeněk, Małek Marcin, Torzewski Janusz
Institute of Robots & Machine Design, Faculty of Mechanical Engineering, Military University of Technology, 2 Gen. S. Kaliskiego St., 00-908 Warsaw, Poland.
Department of Mechanical Engineering, Faculty of Military Technology, University of Defence, 662 10 Brno, Czech Republic.
Materials (Basel). 2025 Aug 13;18(16):3808. doi: 10.3390/ma18163808.
The article presents an analysis of the mechanical properties of S700MC steel, which represents advanced low-alloy high-strength steels. The influence of microstructure, shaped by a controlled thermo-mechanical rolling process, on the strength, ductility, and resistance to cracking and fatigue of the material is discussed. Particular attention is paid to the anisotropy of mechanical properties resulting from the orientation relative to the rolling direction, manifested by variations in yield strength, tensile strength, and total elongation of the specimens. The analysis also includes the material's behavior under dynamic conditions, where the steel's strength increases with the strain rate. Experimental investigations conducted using the digital image correlation (DIC) method enabled a detailed assessment of local strains and fracture characteristics of specimens subjected to both static and dynamic testing. The results showed that specimens cut along the rolling direction exhibited, on average, 6.4% higher tensile strength and 6.8% higher yield strength compared to those cut transversely. Moreover, dynamic loading led to an increase in load-bearing capacity of over 10% compared to static tests. The obtained data are highly relevant from the perspective of structural design, where the selection of material orientation and the consideration of strain rate effects are crucial for ensuring the reliability of components made from S700MC steel.
本文对代表先进低合金高强度钢的S700MC钢的力学性能进行了分析。讨论了由可控热机械轧制工艺形成的微观结构对材料强度、延展性、抗裂性和抗疲劳性的影响。特别关注了相对于轧制方向的取向导致的力学性能各向异性，这表现为试样屈服强度、抗拉强度和总伸长率的变化。分析还包括材料在动态条件下的行为，在动态条件下钢的强度随应变率增加。使用数字图像相关（DIC）方法进行的实验研究能够详细评估静态和动态测试下试样的局部应变和断裂特性。结果表明，与横向切割的试样相比，沿轧制方向切割的试样平均抗拉强度高6.4%，屈服强度高6.8%。此外，与静态试验相比，动态加载导致承载能力提高超过10%。从结构设计的角度来看，获得的数据具有高度相关性，在结构设计中，材料取向的选择和应变率效应的考虑对于确保由S700MC钢制成的部件的可靠性至关重要。
