Numerical simulations of temperature and stress field of Fe-Mn-Si-Cr-Ni shape memory alloy coating synthesized by laser cladding

Zhang, Qi; Xu, Peng; Zha, Gangqiang; Ouyang, Zhi Ying; He, Detao

doi:10.1016/j.ijleo.2021.167079

Cited by 37 publications

(6 citation statements)

References 23 publications

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“…The compression-tension cycle presented by local heating/cooling inhomogeneity during laser scanning between high-speed laser cladding and low-speed laser cladding is the cause of residual high density dislocation [ 10 ]. The maximum residual stress of the laser along the scanning direction is the main cause of defects in the vertical coating [ 11 ]. In the solidification process of CoCrNi MEAs, the grains can gradually increase through the process of growing and coalescing.…”

Section: Resultsmentioning

confidence: 99%

Effect of scanning speeds on mechanical properties of CoCrNi medium entropy alloy prepared by laser additive manufacturing

Kong,

Li,

Tan

et al. 2024

Heliyon

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Section: Resultsmentioning

confidence: 99%

Effect of scanning speeds on mechanical properties of CoCrNi medium entropy alloy prepared by laser additive manufacturing

Kong,

Li,

Tan

et al. 2024

Heliyon

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“…The following assumptions were included in the simulation: (1) the entire surface of the subject was considered as a plane; (2) classical heat transfer theory was applied to the interaction of the laser and materials; (3) the influence of temperature on the material density was excluded, and the material was isotropic; (4) the influence of the liquid flow in the molten pool was not considered; and (5) the room temperature was 20 • C [13].…”

Section: Assumptionsmentioning

confidence: 99%

Failure Analysis of a Chromium Plating Layer on a Piston Rod Surface and the Study of Ni-Based Composite Coating with Nb Addition by Laser Cladding

Wang

Zhang

Shen

et al. 2022

Metals

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The failure of a chromium plating layer on the surface of a piston rod was analyzed, and an Ni-based alloy mixed with a niobium (Nb) composite coating was investigated by means of stereomicroscopy, metallographic microscopy, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), Vickers hardness testing, and wear testing. The results show that penetrating cracks were present in the chromium layer. Subsequently, the corrosion intensified, resulting in the bubbling, cracking, and peeling of the chromium layer. The cladding layer presented a structure morphology of planar crystalline at the bottom, dendritic at the middle, and equiaxial crystalline at the top. The solidification parameters, which were derived from simulation results, confirmed that the ratios between temperature gradient (G) and solidification speed (S) decreased, and the values of the cooling speeds increased from the bottom to the top of the cladding layer. With an increase in Nb content, the structure became gradually refined and uniformly dense. The cladding layer of the Ni-based alloy mixed with Nb was mainly composed of γ-Ni, Cr23C6, Cr7C3, NbC, and Ni3Nb. NbC could be formed in situ and presented itself in four forms: particles, dendrites, polyhedrals, and networks. The microhardness of the coating with 15% added Nb was enhanced to 400 HV0.2, and the wear resistance thereof was 11.14 times higher than the substrate. After the 15% Nb coating had aged for 16 h, the diffraction peak intensities of Cr23C6 and Cr7C3 significantly increased, and the volume fraction of granular NbC increased from 1.67% to 2.54%. The microhardness was enhanced to 580 HV0.2, and the wear resistance thereof was better than that of the chromium plating layer.

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“…5(a). In the process of simulation, the size of the meshing is often inversely proportional to the computational efficiency and accuracy [18]. The temperature distribution in the deposition region is relatively concentrated, so the grid in this region is refined, and the grid in other regions is gradually coarse.…”

Section: Thermophysical Propertiesmentioning

confidence: 99%

Research on the temperature control strategy of thin-wall parts fabricated by laser direct metal deposition

Chen

Liu

et al. 2022

Int J Adv Manuf Technol

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To solve the problem that the macro-size, microhardness, and mechanical properties of the laser direct metal deposition (DMD) of thin-walled parts are inconsistent due to the heat accumulation, an improved three-dimensional finite element heat propagation model was developed to simulate the temperature evolution of the single-pass multi-layer thin-walled parts.The results show that the heat accumulation is contributed to the transformation of the heat dissipation mechanism from three-dimensional to two-dimensional, while the residual heat of the former layer has no significant effect on the heat accumulation of the current layer. The optimized strategy of decreasing laser power gradually is more effective than the optimized strategy of increasing the time interval between layers in maintaining the stability of the molten pool. The integrated optimized strategy of parabolic-shape laser power decreasing and time interval of 5 s is the most effective method to reduce the heat accumulation in the DMD of thinwalled parts. The thin-walled parts with an optimized deposition process have a more uniform width, finer microstructure, and higher microhardness. This work provides theoretical guidance for reducing the heat accumulation during DMD thin-walled parts and is beneficial to improving the uniformity of mechanical properties of thin-walled parts.

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Numerical simulations of temperature and stress field of Fe-Mn-Si-Cr-Ni shape memory alloy coating synthesized by laser cladding

Cited by 37 publications

References 23 publications

Effect of scanning speeds on mechanical properties of CoCrNi medium entropy alloy prepared by laser additive manufacturing

Effect of scanning speeds on mechanical properties of CoCrNi medium entropy alloy prepared by laser additive manufacturing

Failure Analysis of a Chromium Plating Layer on a Piston Rod Surface and the Study of Ni-Based Composite Coating with Nb Addition by Laser Cladding

Research on the temperature control strategy of thin-wall parts fabricated by laser direct metal deposition

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