Effects of stress-relief heat treatment on the microstructure and fatigue property of a laser additive manufactured 12CrNi2 low alloy steel

Cui, X.; Zhang, S.; Wang, C.; Zhang, C.H.; Chen, J.; Zhang, J.B.

doi:10.1016/j.msea.2020.139738

Cited by 65 publications

(18 citation statements)

References 35 publications

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“…However, the stress-relieving heat treatment significantly improves the ductility of fatigue specimens due to the dispersed Si particles and the relief of residual stress. Moreover, the stress-relieved specimens with higher ductility have more activated slip systems under cyclic deformation, which would increase the fatigue life of as-built specimens (Cui et al , 2020). Compared to as-built specimens without heat treatment, there are little differences among the microstructure of stress-relieved specimens with different curvatures.…”

Section: Resultsmentioning

confidence: 99%

High-cycle fatigue properties of curved-surface AlSi10Mg parts fabricated by powder bed fusion additive manufacturing

Zhou

Abbara

Jiang

et al. 2022

RPJ

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Purpose This study aims to uncover the multiscale relations among geometry, surface finish, microstructure and fatigue properties of curved-surface AlSi10Mg parts fabricated by powder bed fusion (PBF) additive manufacturing. Design/methodology/approach This paper investigated the high-cycle tensile and bending fatigue behaviors of PBF-built AlSi10Mg parts with curved surfaces. Besides, the surface finish, porosity and microstructure around various curvatures were characterized. Meanwhile, the stress distributions of the fatigue specimens with curved surfaces under the dynamic tensile/bending loading were analyzed via theoretical analysis and ANSYS simulation. Findings The results showed that the as-built specimens with the smallest curvature exhibited the best surface quality, smallest grain sizes and thinnest grain boundaries. In addition, the tensile fatigue fracture occurred around the largest curvature position of fatigue specimens, which was consistent with the simulated fatigue safety factor results. Moreover, the bending fatigue specimens with the largest curvature presented the shortest fatigue life due to the highest bending and shear stresses along the loading direction. Originality/value So far, most studies have focused on the fatigue behavior of as-built AlSi10Mg parts with planar structures only. The investigation on fatigue properties of as-built AlSi10Mg parts with curved surfaces remains unexplored. This study provides new insights into the characterization and quantification of the fatigue performance of PBF-built metal parts with complex geometries, the knowledge of which can promote their adoption in real industries.

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Section: Resultsmentioning

confidence: 99%

High-cycle fatigue properties of curved-surface AlSi10Mg parts fabricated by powder bed fusion additive manufacturing

Zhou

Abbara

Jiang

et al. 2022

RPJ

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“…Meanwhile, the first solidified parts constrain the deformation of the latter parts, leading to increased internal stress and promoting dislocation density. The dislocations eventually aggregate by sliding due to the elevated temperature to minimize the energy of the system, leading to the formation of cell walls (figure 6(b)) [28]. Figures 5(d) and (e) show that defects such as cracks and holes are located at the cell walls, suggesting the formation of a suitable cell structure, although the dislocations cannot be characterized.…”

Section: Mechanical Performance Testingmentioning

confidence: 99%

Microstructure characterization and mechanical behaviour of laser additive manufactured ultrahigh-strength M54 steel

Zhao

Ning

et al. 2022

Mater. Res. Express

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Ultra high-strength M54 steel blocks were fabricated by laser metal deposition. The microstructure and mechanical behavior of the material were investigated systematically. The microstructure of the as-deposited M54 steel is anisotropic; the cross-section (XOY plane) has a cellular structure, whereas the longitudinal section (XOZ and YOZ planes) shows a mixture of alternating cellular and columnar forms. Compositional segregation is present at the cell walls (interdendritic regions) in the as-deposited state, resulting in retained austenite at the cell walls. The cross-sectional XOY plane contains 10.08% austenite, whereas the XOZ and YOZ planes contain 24.59% and 22.4% austenite, respectively. The retained austenite at the cell wall (interdendritic region) has low thermal and mechanical stability and disappears after the cryogenic treatment or is transformed into martensite during a tensile test. The as-deposited samples show anisotropic mechanical properties. The transverse samples exhibit stronger transformation-induced plasticity (TRIP) and work hardenability with a lower yield strength of 662 MPa and higher ultimate strength of 1982 MPa, corresponding to a higher amount of retained austenite in this direction. The longitudinal ultimate strength and yield strength are 1832 MPa and 997 MPa, respectively. The ductility and toughness are also largely anisotropic, and their reduction in the transverse direction is only 1/3 of that in the longitudinal direction. The Vickers hardness of the microstructure increases slightly from the bottom to the middle and upper part of the sample due to less thermal cycling in the upper part.

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“…On the contrary, as the deposition height increases, each layer has undergone various complex thermal cycling effects, and the texture intensity is weak. [7,31] Figure 7 is a statistical diagram of the grain boundary misorientation angles of each gradient surface of the GAS. Generally, the low angle grain boundary (LAGB) is composed of grain boundaries with orientation difference angle less than 10 between adjacent grains.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

“…Using computer aided design (CAD) data file model input by computer, complex 3D parts can be produced under the control of program, in which the processing cycle can be greatly shortened, and the more complex the product structure, the higher is the production efficiency. [5][6][7][8] At present, there are few studies on the additive production of 24CrNiMo HSLA steel using LAM technology. Kang et al [9] have prepared single-track, single-layer, and multilayer 24CrNiMo HSLA steel specimens by laser melting deposition (LMD) technology.…”

Section: Introductionmentioning

confidence: 99%

Novel Gradient Alloy Steel with Quasi‐Continuous Ratios Fabricated by Selective Laser Melting: Microstructure and Corrosion Behavior

Zhang

Zhou

et al. 2021

steel research int.

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In this article, a quasi‐continuous ratio gradient alloy steel (GAS) with a 24CrNiMo high‐strength low‐alloy steel matrix for high‐speed railway brake discs is fabricated by selective laser melting (SLM). The composition of GAS is X% 24CrNiMo + (1–X)% wear‐resistant stainless steel (WSS), in which X is 100, 65, 35, and 0. The relationship between the microstructure and the corrosion resistance is intensively studied by electron backscatter diffraction (EBSD) and potentiodynamic electrochemical equipment. With the increase in the content of WSS, the low angle grain boundaries of the GAS increases, and the microstructure refines and the texture intensity decreases. The passivation film of the external WSS strengthening layer is dense; the corresponding corrosion potential and corrosion current density are −0.109 V and 2.08 × 10−8 A cm−2, respectively. The corrosion current density is about 1% of the substrate 24CrNiMo, and the corrosion resistance of the material is significantly improved.

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Effects of stress-relief heat treatment on the microstructure and fatigue property of a laser additive manufactured 12CrNi2 low alloy steel

Cited by 65 publications

References 35 publications

High-cycle fatigue properties of curved-surface AlSi10Mg parts fabricated by powder bed fusion additive manufacturing

High-cycle fatigue properties of curved-surface AlSi10Mg parts fabricated by powder bed fusion additive manufacturing

Microstructure characterization and mechanical behaviour of laser additive manufactured ultrahigh-strength M54 steel

Novel Gradient Alloy Steel with Quasi‐Continuous Ratios Fabricated by Selective Laser Melting: Microstructure and Corrosion Behavior

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