Goanta Viorel, Munteanu Corneliu, Müftü Sinan, Istrate Bogdan, Schwartz Patricia, Boese Samuel, Ferguson Gehn, Morăraș Ciprian Ionut
Mechanical Engineering, Mechatronics and Robotics Department, Mechanical Engineering Faculty, "Gheorghe Asachi" Technical University of Iasi, 700050 Iasi, Romania.
Technical Sciences Academy of Romania, 26 Dacia Blvd., 030167 Bucharest, Romania.
Materials (Basel). 2022 May 18;15(10):3609. doi: 10.3390/ma15103609.
Cold spray technique has been major improved in the last decades, for studying new properties for metals and alloys of aluminum, copper, nickel, and titanium, as well as steels, stainless steel and other types of alloys. Cold sprayed Ni/CrC coatings have the potential to provide a barrier as well as improved protection to steels. Fatigue characteristics of 52100 steel coated with Ni/Chrome-Carbide (Ni/CrC) powder mixture by using cold gas dynamic spray are investigated. Fatigue samples were subjected to symmetrically alternating, axially applied cyclic fatigue loading until failure. The test was stopped if a sample survived more than 5 × 10 cycles at the applied stress. Fracture surfaces for each sample were examined to investigate the behaviour of the coating both at high stress levels and at a high number of stress cycles. Scanning electron microscopy was used to assess the damage in the interface of the two materials. Good fatigue behaviour of the coating material was observed, especially at low stresses and a high number of cycles. Details of the crack initiation region, the stable crack propagation region and the sudden crack expansion region are identified for each sample. In most of the samples, the initiation of the crack occurred on the surface of the base material and propagated into the coating material. The possible effects of coatings on the initial deterioration of the base material and the reduction of the lifespan of the coated system were also investigated. The aim of the paper was to study the interface between the base material and the coating material at the fatigue analysis for different stresses, highlighting the appearance of cracks and the number of breaking cycles required for each sample.
在过去几十年中，冷喷涂技术有了重大改进，用于研究铝、铜、镍、钛等金属和合金以及钢、不锈钢和其他类型合金的新性能。冷喷涂镍/碳化铬涂层有可能为钢提供屏障并增强防护。研究了采用冷气体动力喷涂技术，用镍/碳化铬（Ni/CrC）粉末混合物涂覆的52100钢的疲劳特性。疲劳试样承受对称交变、轴向施加的循环疲劳载荷直至失效。如果试样在施加应力下存活超过5×10次循环，则试验停止。检查每个试样的断口表面，以研究涂层在高应力水平和高应力循环次数下的行为。使用扫描电子显微镜评估两种材料界面处的损伤。观察到涂层材料具有良好的疲劳性能，特别是在低应力和高循环次数下。确定了每个试样裂纹萌生区域、稳定裂纹扩展区域和突然裂纹扩展区域的细节。在大多数试样中，裂纹起始于基体材料表面并扩展到涂层材料中。还研究了涂层对基体材料初始劣化和涂层系统寿命降低的可能影响。本文的目的是在不同应力下的疲劳分析中研究基体材料与涂层材料之间的界面，突出裂纹的出现以及每个试样所需的断裂循环次数。
