Advanced Search
YANG Wuhong, DING Xu, FANG Jinxiang, YANG Xiuye, ZHAO Geng, WANG Jiaxuan, HE Haotian. Study on the effect on microstructure and properties of CoCrNiMo0.0136 medium-entropy alloy in laser deposited by post-treatment[J]. LASER TECHNOLOGY, 2022, 46(6): 742-748. DOI: 10.7510/jgjs.issn.1001-3806.2022.06.005
Citation: YANG Wuhong, DING Xu, FANG Jinxiang, YANG Xiuye, ZHAO Geng, WANG Jiaxuan, HE Haotian. Study on the effect on microstructure and properties of CoCrNiMo0.0136 medium-entropy alloy in laser deposited by post-treatment[J]. LASER TECHNOLOGY, 2022, 46(6): 742-748. DOI: 10.7510/jgjs.issn.1001-3806.2022.06.005

Study on the effect on microstructure and properties of CoCrNiMo0.0136 medium-entropy alloy in laser deposited by post-treatment

More Information
  • Received Date: September 27, 2021
  • Revised Date: October 25, 2021
  • Published Date: November 24, 2022
  • In order to study the effect and mechanism of post-treatment on the microstructure and properties of medium entropy alloy in CoCrNi, the medium-entropy alloy in Co0.3288-Cr0.3288-Ni0.3288-Mo0.0136 was prepared by laser deposition. The microstructure and properties of medium-entropy alloy in CoCrNiMo0.0136 under laser deposition, hot forging and hot forging sandblasting were characterized by optical microscope, scanning electron microscope, X-ray diffractometer, electron backscatter diffraction, 3-D surface profilometer, and universal tensile testing machine. The results show that the medium-entropy alloy in laser deposited CoCrNiMo0.0136 has stable face-centered cubic structure after as-deposited, hot-forging, and hot-forging sandblasting. In the deposited state, the grain size of alloy is coarse, because of microsegregation, there is a substructure with uneven distribution of elements in the grain, and the strength of the alloy is low, but the plasticity is good. After hot forging treatment, the grain size of alloy is significantly refined, and more annealing twins can be observed. Compared with the laser deposited state, the yield strength is increased by 132.88%, the tensile strength is increased by 53.78%, and the elongation has no obvious change. After the hot forging sample was sandblasted, the surface of the sample showed a gradient nanostructure with a thickness of about 100μm, and there were a large number of nano-twins in the plastic deformation layer, the yield strength and tensile strength increased by 220.09% and 96.22% respectively, and the elongation did not change significantly. Through thermoplastic processing and preparation of nano-gradient surface structure, the static properties of medium-entropy alloy in Mo-doped CoCrNi can be effectively improved.
  • [1]
    WONG S L, MADIVALA M, PRAHL U, et al. A crystal plasticity model for twinning- and transformation-induced plasticity[J]. Acta Materialia, 2016, 118: 140-151. DOI: 10.1016/j.actamat.2016.07.032
    [2]
    LAPLANCHE G, KOSTKA A, REINHART C, et al. Reasons for the superior mechanical properties of medium-entropy CrCoNi compared to high-entropy CrMnFeCoNi[J]. Acta Materialia, 2017, 128: 292-303. DOI: 10.1016/j.actamat.2017.02.036
    [3]
    WENG F, CHEW Y, ZHU Z, et al. Excellent combination of strength and ductility of CoCrNi medium entropy alloy fabricated by laser aided directed energy deposition[J]. Additive Manufacturing, 2020, 34: 101202. DOI: 10.1016/j.addma.2020.101202
    [4]
    ZHOU K X, LI J J, WANG L L, et al. Direct laser deposited bulk CoCrFeNiNbx high entropy alloys[J]. Intermetallics, 2019, 114: 106592. DOI: 10.1016/j.intermet.2019.106592
    [5]
    CHEW Y, BI G J, ZHU Z G, et al. Microstructure and enhanced strength of laser aided additive manufactured CoCrFeNiMn high entropy alloy[J]. Materials Science and Engineering, 2019, 744(28): 137-144.
    [6]
    ZHU Z G, NGUYEN Q B, NG F L, et al. Hierarchical microstructure and strengthening mechanisms of a CoCrFeNiMn high entropy alloy additively manufactured by selective laser melting[J]. Scripta Materialia, 2018, 154: 20-24. DOI: 10.1016/j.scriptamat.2018.05.015
    [7]
    WENG F, CHEW Y, ZHU Z, et al. Influence of oxides on the cryogenic tensile properties of the laser aided additive manufactured CoCrNi medium entropy alloy[J]. Composites, 2021, B216: 108837.
    [8]
    WANG Y, ZHOU X F. Research frontier and development trend of laser additive manufacturing[J]. Laser Technology, 2021, 45(4): 475-484(in Chinese).
    [9]
    XUE Y J, LI Sh Y, WANG Zh P, et al. Effect of hot rolling on microstructure and properties of entropy alloy in CoCrNi[J]. Journal of Xi'an University of Technology, 2019, 39(2): 179-184(in Chinese).
    [10]
    CHEN Y, FANG Y, FU X, et al. Origin of strong solid solution strengthening in the CrCoNi-W medium entropy alloy[J]. Journal of Materials Science and Technology, 2021, 73(14): 101-107.
    [11]
    LI Sh Y, WANG H, PENG Y L, et al. Effect of annealing process on microstructure and properties of entropy alloy in cold rolled CoCrNi[J]. Journal of Xi'an University of Technology, 2020, 40(1): 96-101(in Chinese).
    [12]
    CHANG R, FANG W, YAN J, et al. Microstructure and mechanical properties of CoCrNi-Mo medium entropy alloys: Experiments and first-principle calculations[J]. Journal of Materials Science and Technology, 2021, 62: 25-33. DOI: 10.1016/j.jmst.2020.04.062
    [13]
    JIANG Y L, FANG J X, YANG W H, et al. Study on microstructure and properties of medium carbon high strength bainitic steel deposited by laser powder deposition[J]. Laser Technology, 2021, 45(6): 709-714(in Chinese).
    [14]
    BENJAMIN S, BERNHARD V, JURAJ T, et al. Influence of annealing on microstructure and mechanical properties of a nanocrystalline CrCoNi medium-entropy alloy[J]. Materials, 2018, 11(5): 662. DOI: 10.3390/ma11050662
    [15]
    GENG Y, KONOVALOV S V, CHEN X. Research status and application of the high-entropy and traditional alloys fabricated via the laser cladding[J]. Progress in Metal Physics, 2020, 21(1): 26-45. DOI: 10.15407/ufm.21.01.026
    [16]
    ZHAO Y L, YANG T, TONG Y, et al. Heterogeneous precipitation behavior and stacking-fault-mediated deformation in a CoCrNi-based medium-entropy alloy[J]. Acta Materialia, 2017, 138: 72-82. DOI: 10.1016/j.actamat.2017.07.029
    [17]
    DENG H W, WANG M M, XIE Z M, et al. Enhancement of strength and ductility in non-equiatomic CoCrNi medium-entropy alloy at room temperature via transformation-induced plasticity[J]. Materials Science and Engineering, 2021, A804: 140516.
    [18]
    WANG Z, GU J, AN D, et al. Characterization of the microstructure and deformation substructure evolution in a hierarchal high-entropy alloy by correlative EBSD and ECCI[J]. Intermetallics, 2020, 121: 106788. DOI: 10.1016/j.intermet.2020.106788
    [19]
    MADIVALA M, SCHWEDT A, WONG S L, et al. Temperature dependent strain hardening and fracture behavior of TWIP steel[J]. International Journal of Plasticity, 2018, 104: 80-103. DOI: 10.1016/j.ijplas.2018.02.001
    [20]
    GLUDOVATZ B, HOHENWARTER A, THURSTON K, et al. Exceptional damage-tolerance of a medium-entropy alloy CrCoNi at cryogenic temperatures[J]. Nature Communications, 2016, 7: 10602. DOI: 10.1038/ncomms10602
    [21]
    CHANG R, FANG W, BAI X, et al. Effects of tungsten additions on the microstructure and mechanical properties of CoCrNi medium entropy alloys[J]. Journal of Alloys & Compounds, 2019, 790: 732-743.

Catalog

    Article views (8) PDF downloads (7) Cited by()

    /

    DownLoad:  Full-Size Img  PowerPoint
    Return
    Return