Studies on Formation Mechanism of In Situ Particles During Laser Direct Deposition of Fe-Based Composite Coatings with V
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INTRODUCTION
THE laser direct deposition method, which is a new surface modification technology, has shown broad application prospects in industrial applications (e.g., the aerospace, automotive, die, and roll repair industries) because an excellent comprehensive performance, including good wear resistance, corrosion resistance, high-temperature resistance, and oxidation resistance,
GUILI YIN is with the Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Key Laboratory for Laser Application Technology and Equipment of Liaoning Province, School of Materials and Engineering, Northeastern University, Shenyang 110819, P.R. China and also with School of Material Science and Engineering, Liaoning University of Technology, Jinzhou 121001, P.R. China. SUIYUAN CHEN, JING LIANG, and CHANGSHENG LIU are with the Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, Key Laboratory for Laser Application Technology and Equipment of Liaoning Province, School of Materials and Engineering, Northeastern University. Contact e-mail: [email protected] MEI WANG is with Shenyang Dalu Laser Technology Co. Ltd., Shenyang 110819, P.R. China. Manuscript submitted October 29, 2018.
METALLURGICAL AND MATERIALS TRANSACTIONS A
can be obtained when this technology is used on low-cost metal substrates.[1,2] In fact, these excellent properties are mainly related to the formation, decomposition, morphology, and distribution of the in situ particle-reinforced phases (Cr3C2, Cr7C3, Fe3C, Cr23C6, etc.) in coatings. Therefore, the formation mechanism of these in situ particle-reinforced phases has always been a topic of interest. Emamian et al.[3] studied the influence of a combination of laser parameters on the in situ formed TiC morphology during laser cladding. The study results showed that the laser parameters play an important role in the morphology of TiC because different dendritic or spherical TiC particles could be observed. Wu et al.[4] pointed out that M23C6 and M2C could be precipitated in austenite during the high-temperature aging of a laser cladding coating. The in situ transformations of dendrite M7C3 to M23C6 and eutectic M7C3 to M6C could also be observed. Another study[5] focused on the effects of Re2O3 on the microstructure and nucleation of carbide particles in laser cladding Fe-based composite coatings, and reported that Re2O3 could promote the nucleation of the reinforcement particles as heterogeneous nuclei. Yuan et al.[6] studied the growth characteristics of carbide M7C3 in a composite coating, and showed that the dry sliding friction and wear resistance of a coating reinforced by in situ (Cr, Fe)7C3 particles were better than those of a pure Fe-CrNiBSi alloy coating. With the current laser cladding technology, an in situ synthesis method with
which metal matrix composites can be formed using pure powder is often adopted to control the volume fraction, size, morphology, and distribution of the carbide phases in coatings.[3] However, the formation mechanism of the in si
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