Yu Yingyan, Qu Zhiyuan, Zhang Jiansheng, Zhou Jie
Chongqing Key Laboratory of Advanced Mold Intelligent Manufacturing, College of Materials Science and Engineering, Chongqing University, Chongqing 400044, China.
Chongqing Jiepin Technology Co., Ltd., Chongqing 400044, China.
Materials (Basel). 2022 Aug 31;15(17):6020. doi: 10.3390/ma15176020.
Wire arc additively manufactured (WAAM) Ni-based materials have good properties but are costly and hard to cut, leading to difficulties in machining after welding and wasting the materials. To overcome these shortcomings, this work proposes a method of surfacing Fe-based alloy layers on WAAM Ni-based material. The effect of this method on the microstructure and wear properties of WAAM Ni-based materials is discussed. In this work, a Fe-based alloy (JX103) was welded as the last layers of the WAAM Ni-based superalloy (JX201) material. The hardness, microstructure, and wear behavior of the material with different residual Fe-based materials were tested and analyzed. Our results indicate that the surface hardness was smoothly increased from HV350 to HV400 by overlaying Fe-based alloy layers. Microstructure analysis shows that γ-Fe gradually disappears, and the carbide form changes from WAAM Ni-based superalloys to Fe-based alloys. In the fusion boundary, the occurrence of cellular dendritic growth, a type -Ⅱ boundary, and low dilution indicate good crack resistance and good connection performance between these two materials. The wear test showed that the wear resistance of JX201 was decreased by changing the last layer to JX103. However, as the residual thickness of JX103 decreased, the influence gradually reduced. Meanwhile, the wear mechanism changed from severe abrasive and adhesive wear to light abrasive wear. When the thickness is less than 0.5 mm, the wear weight per minute is at the same level as the sample without JX103.
电弧增材制造（WAAM）的镍基材料具有良好的性能，但成本高昂且难以切割，导致焊接后加工困难并造成材料浪费。为克服这些缺点，本文提出一种在WAAM镍基材料上堆焊铁基合金层的方法。讨论了该方法对WAAM镍基材料微观结构和磨损性能的影响。在本文中，将一种铁基合金（JX103）作为WAAM镍基高温合金（JX201）材料的最后一层进行焊接。对具有不同残余铁基材料的该材料的硬度、微观结构和磨损行为进行了测试和分析。我们的结果表明，通过堆焊铁基合金层，表面硬度从HV350平稳增加到HV400。微观结构分析表明，γ-Fe逐渐消失，碳化物形态从WAAM镍基高温合金转变为铁基合金。在熔合边界处，胞状树枝晶生长、Ⅱ型边界的出现以及低稀释率表明这两种材料之间具有良好的抗裂性和连接性能。磨损试验表明，将最后一层更换为JX103后，JX201的耐磨性降低。然而，随着JX103残余厚度的减小，这种影响逐渐减弱。同时，磨损机制从严重的磨粒磨损和粘着磨损转变为轻微的磨粒磨损。当厚度小于0.5mm时，每分钟的磨损重量与不含JX103的样品处于同一水平。
