Microstructures and Properties of 300M Steel Coatings Fabricated by Ultra-High-Speed Laser Cladding AITranslate
Abstract AITranslate
Ultra-high-speed laser cladding technology，as an advanced surface coating technology，has the advantages of low dilute rates，low thermal stress，little influences on the substrates，and high deposition efficiency，and has wide application prospects in improving the corrosion resistance and wear resistance of parts. 300M （40CrNi2Si2MoVA）steel，as the key materials of landing gear structures，is prone to damage and corrosion in the inherent contact of landing gears and in the face of high temperature，high humidity，and high salt environment. In order to solve the above problems，300M steel coatings were fabricated by ultra-high-speed laser cladding，and the effects of cladding speed on the microstructures and properties of the coatings were studied. The microstructures of the coatings were characterized by a scanning electron microscope （SEM），and the phase structures were characterized by an X-ray diffractometer （XRD），and the microhardness，wear resistance，and corrosion resistance of the coatings were characterized and tested by a Vickers microhardness tester，a friction and wear tester，and an electrochemical workstation. The results indicated that the defects of the coatings decreased and the dilution rates decreased from （35.2%±1.8%）to （24.8%±2.4%），and the average grain sizes of the coatings decreased from （5.8±1.6）to （3.2±1.1）μm with the increase of cladding speed from 1.8 to 40 m·min−1. The coatings were mainly composed of martensite，carbides and retained austenite，and there was not significant difference in phase structures of coatings at different cladding speeds，which played a crucial role in improving the comprehensive properties of the coatings. The grain structures of coatings were refined，the reduction of pores and the distribution of elements was more uniform with the increase of cladding speed，which improved the mechanical properties and corrosion resistance of coatings，and compared with the substrates，the coatings had better comprehensive properties. The average microhardness，wear rates，and corrosion current density of substrates were HV （299.8±17.8），（5.63±1.06）×10−6 mm3·N−1·m−1 and 1.17×10−6 A·cm−2，respectively. The microhardness of the coatings increased，and the friction coefficients，wear rates and corrosion current density of the coatings decreased with the increase of cladding speed. Therefore，the wear resistance and corrosion resistance of the coatings were improved when the cladding speed increased from 1.8 to 40 m·min−1. The coatings exhibited the best comprehensive properties，and the average microhardness，wear rates，and corrosion current density of coatings were HV （579.6±61.8），（0.84±0.41）×10−6 mm3·N−1·m−1，and 8.45×10−7 A·cm−2 when the cladding speed was 40 m·min−1.
KeyWords AITranslate
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Basic Information:
DOI：10.13373/j.cnki.cjrm.XY24040029
Chinese Library Classification Number:TN249
Citation Information:
Ultra-high-speed laser cladding technology，as an advanced surface coating technology，has the advantages of low dilute rates，low thermal stress，little influences on the substrates，and high deposition efficiency，and has wide application prospects in improving the corrosion resistance and wear resistance of parts. 300M （40CrNi2Si2MoVA）steel，as the key materials of landing gear structures，is prone to damage and corrosion in the inherent contact of landing gears and in the face of high temperature，high humidity，and high salt environment. In order to solve the above problems，300M steel coatings were fabricated by ultra-high-speed laser cladding，and the effects of cladding speed on the microstructures and properties of the coatings were studied. The microstructures of the coatings were characterized by a scanning electron microscope （SEM），and the phase structures were characterized by an X-ray diffractometer （XRD），and the microhardness，wear resistance，and corrosion resistance of the coatings were characterized and tested by a Vickers microhardness tester，a friction and wear tester，and an electrochemical workstation. The results indicated that the defects of the coatings decreased and the dilution rates decreased from （35.2%±1.8%）to （24.8%±2.4%），and the average grain sizes of the coatings decreased from （5.8±1.6）to （3.2±1.1）μm with the increase of cladding speed from 1.8 to 40 m·min−1. The coatings were mainly composed of martensite，carbides and retained austenite，and there was not significant difference in phase structures of coatings at different cladding speeds，which played a crucial role in improving the comprehensive properties of the coatings. The grain structures of coatings were refined，the reduction of pores and the distribution of elements was more uniform with the increase of cladding speed，which improved the mechanical properties and corrosion resistance of coatings，and compared with the substrates，the coatings had better comprehensive properties. The average microhardness，wear rates，and corrosion current density of substrates were HV （299.8±17.8），（5.63±1.06）×10−6 mm3·N−1·m−1 and 1.17×10−6 A·cm−2，respectively. The microhardness of the coatings increased，and the friction coefficients，wear rates and corrosion current density of the coatings decreased with the increase of cladding speed. Therefore，the wear resistance and corrosion resistance of the coatings were improved when the cladding speed increased from 1.8 to 40 m·min−1. The coatings exhibited the best comprehensive properties，and the average microhardness，wear rates，and corrosion current density of coatings were HV （579.6±61.8），（0.84±0.41）×10−6 mm3·N−1·m−1，and 8.45×10−7 A·cm−2 when the cladding speed was 40 m·min−1.
quote
| GB/T 7714-2015 | [1] Kun Xu, Chengjie Ge, Zhangyong Hu, et al. Microstructures and Properties of 300M Steel Coatings Fabricated by Ultra-High-Speed Laser Cladding[J]. Chinese Journal of Rare Metals, 2025, 49(9): 1414-1424. DOI:10.13373/j.cnki.cjrm.XY24040029. |
| MLA | [1] Kun Xu, et al., "Microstructures and Properties of 300M Steel Coatings Fabricated by Ultra-High-Speed Laser Cladding." Chinese Journal of Rare Metals, vol. 49, no. 9, 2025, pp. 1414-1424, https://doi.org/10.13373/j.cnki.cjrm.XY24040029. |
| APA | [1] Kun Xu, Chengjie Ge, Zhangyong Hu, Hanbing Guo, Qinhao Zhang, Lu Ren, Xiuyong Chen, & Xinkun Suo. (2025). Microstructures and Properties of 300M Steel Coatings Fabricated by Ultra-High-Speed Laser Cladding. Chinese Journal of Rare Metals, 49(9), 1414-1424. https://doi.org/10.13373/j.cnki.cjrm.XY24040029 |
| IEEE | [1] Kun Xu, Chengjie Ge, Zhangyong Hu, Hanbing Guo, Qinhao Zhang, Lu Ren, Xiuyong Chen, and Xinkun Suo, "Microstructures and Properties of 300M Steel Coatings Fabricated by Ultra-High-Speed Laser Cladding," Chinese Journal of Rare Metals, vol. 49, no. 9, pp. 1414-1424, 2025, doi: 10.13373/j.cnki.cjrm.XY24040029. keywords: {ultra-high-speed laser cladding;cladding speed;microstructures;mechanical properties} |