Krbata Michal, Ciger Robert, Kohutiar Marcel, Eckert Maros, Barenyi Igor, Trembach Bohdan, Dubec Andrej, Escherova Jana, Gavalec Matúš, Beronská Naďa
Faculty of Special Technology, Alexander Dubcek University of Trenčín, 911 06 Trenčín, Slovakia.
Private Joint Stock Company, Novokramatorsky Mashinostroitelny Zavod, 84305 Kramatorsk, Ukraine.
Materials (Basel). 2023 Jun 19;16(12):4473. doi: 10.3390/ma16124473.
The paper deals with the dilatometric study of high-alloy martensitic tool steel with the designation M398 (BÖHLER), which is produced by the powder metallurgy process. These materials are used to produce screws for injection molding machines in the plastic industry. Increasing the life cycle of these screws leads to significant economic savings. This contribution focuses on creating the CCT diagram of the investigated powder steel in the range of cooling rates from 100 to 0.01 °C/s. JMatPro API v7.0 simulation software was used to compare the experimentally measured CCT diagram. The measured dilatation curves were confronted with a microstructural analysis, which was evaluated using a scanning electron microscope (SEM). The M398 material contains a large number of carbide particles that occur in the form of MC and MC and are based on Cr and V. EDS analysis was used to evaluate the distribution of selected chemical elements. A comparison of the surface hardness of all samples in relation to the given cooling rates was also carried out. Subsequently, the nanoindentation properties of the formed individual phases as well as the carbides, where the nanohardness and reduced modulus of elasticity (carbides and matrix) were evaluated.
本文研究了牌号为M398（伯乐）的高合金马氏体工具钢的热膨胀特性，该钢材采用粉末冶金工艺生产。这些材料用于制造塑料工业注塑机的螺杆。延长这些螺杆的使用寿命可显著节省经济成本。本研究着重绘制了所研究粉末钢在100至0.01℃/秒冷却速率范围内的连续冷却转变（CCT）图。使用JMatPro API v7.0模拟软件对实验测得的CCT图进行比较。将测得的膨胀曲线与微观结构分析结果进行对比，微观结构分析通过扫描电子显微镜（SEM）进行评估。M398材料含有大量以MC和M₂C形式存在的碳化物颗粒，这些碳化物基于Cr和V。利用能谱仪（EDS）分析评估选定化学元素的分布。还对所有样品在给定冷却速率下的表面硬度进行了比较。随后，对形成的各个相以及碳化物的纳米压痕特性进行了评估，其中包括纳米硬度和弹性模量（碳化物和基体）。
