Sitek Ryszard, Kulikowski Krzysztof, Paradowski Krystian, Gancarczyk Kamil, Losertová Monika, Kobayashi Akira, Moneta Joanna, Kamiński Janusz
Faculty of Materials Science and Engineering, Warsaw University of Technology, Woloska 141, 02-507 Warsaw, Poland.
Department of Materials Science, Faculty of Mechanical Engineering and Aeronautics, Rzeszow University of Technology, Al. Powstancow Warszawy 12, 35-959 Rzeszow, Poland.
Materials (Basel). 2023 Jul 15;16(14):5020. doi: 10.3390/ma16145020.
The paper investigates the influence of the ion-nitriding process on the microstructure, corrosion resistance, and tensile strength at elevated temperatures of Haynes 282 nickel superalloy specimens produced by the Direct Metal Laser Sintering (DMLS) technique. The study was performed for two conditions, i.e., as-built by DMLS method and as-built by DMLS method + covered by a layer containing CrN + CrN phases. An analysis of the surface morphology revealed that the ion-nitriding process significantly affects the physical and chemical phenomena occurring on the specimen's surface. The XRD measurement of the specimens showed that preparing them with the DMLS method as well as following a nitriding process produced residual tensile stresses. Based on the measurement of the nanohardness distribution through the layer approximatively of 7 μm in width and the superalloys substrate, the results of the nanohardness showed the maximum values of 27 GPa and 13.5 GPa for the nitrided layer and the substrate, respectively. The surface protection from the nitrided layer proved a positive effect on the corrosion resistance of the DMLS specimens in the solution of 0.1 M NaSO + 0.1 M NaCl at room temperature. The results of the tensile tests at 750 °C showed that the ion-nitriding process did not significantly affect the elevated-temperature tensile strength of the superalloy specimens produced with the DMLS technique.
本文研究了离子渗氮工艺对采用直接金属激光烧结（DMLS）技术制备的Haynes 282镍基高温合金试样的微观结构、耐腐蚀性以及高温拉伸强度的影响。研究针对两种情况进行，即采用DMLS方法直接成型以及采用DMLS方法直接成型并覆盖一层含有CrN + CrN相的涂层。表面形貌分析表明，离子渗氮工艺显著影响试样表面发生的物理和化学现象。对试样进行的XRD测量表明，采用DMLS方法制备以及经过渗氮工艺处理后，试样产生了残余拉应力。基于对宽度约为7μm的渗氮层和高温合金基体的纳米硬度分布测量，纳米硬度结果表明，渗氮层和基体的最大值分别为27 GPa和13.5 GPa。在室温下，0.1 M NaSO + 0.1 M NaCl溶液中渗氮层对DMLS试样的表面防护对其耐腐蚀性产生了积极影响。750℃拉伸试验结果表明，离子渗氮工艺对采用DMLS技术制备的高温合金试样的高温拉伸强度没有显著影响。
