Synthetic Effect of Cr and Mo Elements on Microstructure and Properties of Laser Cladding NiCr x Mo y Alloy Coatings
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Synthetic Effect of Cr and Mo Elements on Microstructure and Properties of Laser Cladding NiCrxMoy Alloy Coatings Wen‑Ya Zhang1 · Can‑Ming Wang1 · Jing‑Xin Ji1 · Xiao‑Li Feng1 · Hong‑Zhi Cui1 · Qiang Song1 · Chun‑Zhi Zhang1 Received: 2 January 2020 / Revised: 23 February 2020 / Accepted: 22 March 2020 © The Chinese Society for Metals (CSM) and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract NiCrxMoy (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 NiCrxMoy 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 cor r3+ ions and M o6+ ions in the passive film enhanced the stability of the coatings. rosion resistance of NiCrxMoy coatings. C 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. Keywords NiCrMo coating · Laser cladding · Corrosion behavior · Mechanical properties · Q235 substrate
1 Introduction The booming marine equipment industry has made people committed to manufacturing marine corrosion-resistant products. The excellent pitting corrosion resistance and weldability of NiCrMo alloys make them ideal candidates for marine corrosion applications [1, 2]. It is also a promising coating material on mild steel to keep sound balance between the high cost and desired corrosion resistance. Nowadays, NiCrMo coatings are prepared using a variety Available online at http://link.springer.com/journal/40195. Electronic supplementary material The online version of this article (https://doi.org/10.1007/s40195-020-01081-5) contains supplementary material, which is available to authorized users. * Can‑Ming Wang [email protected] * Hong‑Zhi Cui [email protected] 1
College of Materials Science and Engineering, Shandong University of Science and Technology, Qingdao 266590, China
of methods, such as thermal spraying [3, 4], plasma spraying [5, 6], arc melting [7, 8], and laser remelting [1]. Rapid solidification using laser cladding can be used to obtain fine grains, small thermal deformations, metallurgical combinations of coatings and substrates, and show minor component segregation during non-equilibrium solidification [9–11]. Laser cla
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