Role of melt pool boundary condition in determining the mechanical properties of selective laser melting AlSi10Mg alloy

Xiong, Zhenhua; Liu, Shilong; Li, S.F.; Shi, Yu; Yang, Yi; Misra, R.D.K.

doi:10.1016/j.msea.2018.10.083

Cited by 219 publications

(57 citation statements)

References 20 publications

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“…The nanoindentation curves of ferrite, pearlite and grain boundary in AISI 1045 steel are different. 2,[17][18][19] The loading curve of nanoindentation determines the plasticity, hardening index and strength of the material. The unloading curve determines the elastic behaviour and elastic modulus of the material.…”

Section: Methodsmentioning

confidence: 99%

In situ nanoindentation method for characterizing tensile properties of AISI 1045 steel based on mesomechanical analysis

Zhao

Sun

et al. 2019

Advances in Mechanical Engineering

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A novel method for characterizing the tensile properties of AISI 1045 steel is proposed by combining the method of in situ nanoindentation test and the theory of mesomechanical analysis. First, the load–depth curves of exact location of ferrite, pearlite and grain boundary on the surface of AISI 1045 steel are obtained by 30 groups of in situ nanoindentation tests. The constitutive equation (stress–strain function) of the real-time metallographic structure is obtained by nanoindentation analysis of the above curves. Then, based on the principle of mesomechanical analysis, the computational representative volume element models are reconstructed according to the three metallographic images of AISI 1045 steel surface collected by the test equipment. Finally, taking the constitutive equation of the real-time metallographic structure as the input condition, the finite element analysis of the above representative volume element models are carried out. The data resulted from finite element analysis are taken as the tensile mechanical properties of AISI 1045 steel. The elastic modulus of AISI 1045 steel calculated is as the same as that by the traditional nanoindentation method. And, the error is less than 6% compared with the tensile test, which is within the range of the elastic modulus of the material. The error between the yield strength calculated and tensile test results is 3.4%. Due to the influence of surface cracks on the plastic deformation ability of AISI 1045 steel during tension, the error between the strain hardening index calculated and tensile test results is 7.4%. The results show that it is a more accurate nondestructive testing method in the point of material damage mechanism. On the premise of using more accurate representative volume element modelling way, this method is suitable for testing more materials.

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Section: Methodsmentioning

confidence: 99%

In situ nanoindentation method for characterizing tensile properties of AISI 1045 steel based on mesomechanical analysis

Zhao

Sun

et al. 2019

Advances in Mechanical Engineering

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“…However, several groups have tried to vary the process parameters to study their influence on defect formation and microstructure development ( Figure 32 ). The influence of laser scan speed [ 76 ], hatch spacing [ 76 ], scan strategy (scan orientation) [ 76 ], layer thickness [ 76 ], single-laser or multi-laser melting [ 162 , 163 ], melt pool boundary condition [ 164 ], amount of defocusing [ 165 ], and energy density (the combination of laser power and laser scan speed) [ 166 , 167 ] were studied along these lines. For example, Aboulkhair et al varied the laser scan speed between 250 and 1000 mm/s and observed significant changes in the microstructure [ 76 ].…”

Section: Microstructurementioning

confidence: 99%

Selective Laser Melting of Aluminum and Its Alloys

et al. 2020

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The laser-based powder bed fusion (LBPF) process or commonly known as selective laser melting (SLM) has made significant progress since its inception. Initially, conventional materials like 316L, Ti6Al4V, and IN-718 were fabricated using the SLM process. However, it was inevitable to explore the possible fabrication of the second most popular structural material after Fe-based alloys/steel, the Al-based alloys by SLM. Al-based alloys exhibit some inherent difficulties due to the following factors: the presence of surface oxide layer, solidification cracking during melt cooling, high reflectivity from the surface, the high thermal conductivity of the metal, poor flowability of the powder, low melting temperature, etc. Researchers have overcome these difficulties to successfully fabricate the different Al-based alloys by SLM. However, there exists no review dealing with the fabrication of different Al-based alloys by SLM, their fabrication issues, microstructure, and their correlation with properties in detail. Hence, the present review attempts to introduce the SLM process followed by a detailed discussion about the processing parameters that form the core of the alloy development process. This is followed by the current research status on the processing of Al-based alloys and microstructure evaluation (including defects, internal stresses, etc.), which are dealt with on the basis of individual Al-based series. The mechanical properties of these alloys are discussed in detail followed by the other important properties like tribological properties, fatigue properties, etc. Lastly, an outlook is given at the end of this review.

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“…Without considering the effects of defects (e.g. pore and crack), the MPB is the weakest region of the SLM part (Xiong et al 2019). The reduction of the MPB region, therefore, is beneficial to the improvement of mechanical properties.…”

Section: Microstructurementioning

confidence: 99%

Effect of melting modes on microstructure and tribological properties of selective laser melted AlSi10Mg alloy

Ren

et al. 2020

Virtual and Physical Prototyping

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This paper focuses on the effect of melting modes on microstructural evolution and tribological properties of AlSi10Mg alloy fabricated by selective laser melting (SLM). The results showed that the microstructures of SLM AlSi10Mg consisted of primary α-Al surrounded by cellular Si networks (∼500 nm) when fabricated in conduction mode, but has a finer cellular-like Si phase (∼200 nm) when fabricated in keyhole mode. The strong convection caused by the melt reflow and Marangoni convection under keyhole mode also resulted in deposition of nano-scale Si particles at the bottom of the molten pool. The SLM AlSi10Mg fabricated in keyhole mode exhibited better wear resistance than that fabricated in conduction mode. Compared to traditional as-cast specimens, both SLM specimens showed better wear resistance due to the unique cellular-like networks. The SLM technique offers a new approach for material processing that can be used to refine microstructures for improved tribological properties.

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Role of melt pool boundary condition in determining the mechanical properties of selective laser melting AlSi10Mg alloy

Cited by 219 publications

References 20 publications

In situ nanoindentation method for characterizing tensile properties of AISI 1045 steel based on mesomechanical analysis

In situ nanoindentation method for characterizing tensile properties of AISI 1045 steel based on mesomechanical analysis

Selective Laser Melting of Aluminum and Its Alloys

Effect of melting modes on microstructure and tribological properties of selective laser melted AlSi10Mg alloy

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