NiCr_xMo_y (x = 1, 1.5; y = 0, 0.1, 0.3) alloy coatings were prepared on the Q235 substrate by laser cladding under the protection of argon. The phase composition, microstructure, corrosion behavior, and mechanical properties of the NiCr_xMo_y alloy coatings were investigated using X-ray diffraction, scanning electron microscopy, transmission electron microscopy, electrochemical tests, X-ray photoelectron spectroscopy, microhardness, and nanoindentation tests. As the Cr content increased, the phase composition of the coatings changed from a single face-centered cubic (FCC) structure to a dual-phase structure coexisting with body-centered cubic (BCC) and FCC structures, while the addition of Mo promoted the precipitation of σ phase. The appearance of a homogeneous dual-phase structure and some amount of σ phase played a positive role in the corrosion resistance of NiCr_xMo_y coatings. Cr³⁺ ions and Mo⁶⁺ ions in the passive film enhanced the stability of the coatings. The nanoindentation tests showed that the nanohardness (6.71 GPa) and elastic modulus (184.40 GPa) of BCC phase were higher than those of the FCC phase (5.19 GPa and 155.26 GPa, respectively). Overall, the BCC phase and σ phase improved the mechanical properties of the coatings.

中文翻译：

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Cr和Mo元素的合成对NiCr x Mo y合金熔覆层组织和性能的影响

通过在氩气保护下通过激光熔覆在Q235基板上制备NiCr _x Mo _y（x  = 1，1.5; y  = 0，0.1，0.3）合金涂层。NiCr _x Mo _y的相组成，显微组织，腐蚀行为和力学性能使用X射线衍射，扫描电子显微镜，透射电子显微镜，电化学测试，X射线光电子能谱，显微硬度和纳米压痕测试研究了合金涂层。随着Cr含量的增加，涂层的相组成从单面心立方（FCC）结构变为与体心立方（BCC）和FCC结构共存的双相结构，而Mo的加入促进了涂层的相变。σ相的析出。均匀的双相结构和一定量的σ相的出现对NiCr _x Mo _y涂层的耐蚀性起了积极作用。Cr ³⁺离子和Mo ⁶⁺钝化膜中的离子增强了涂层的稳定性。纳米压痕试验表明，BCC相的纳米硬度（6.71 GPa）和弹性模量（184.40 GPa）高于FCC相的纳米硬度（分别为5.19 GPa和155.26 GPa）。总体而言，BCC相和σ相改善了涂层的机械性能。