A critical review on the effects of process-induced porosity on the mechanical properties of alloys fabricated by laser powder bed fusion

Kan, Wen Hao; Chiu, Louis Ngai Sam; Lim, Chao Voon Samuel; Zhu, Yuman; Tian, Ye; Jiang, Derui; Huang, Aijun

doi:10.1007/s10853-022-06990-7

Cited by 110 publications

(30 citation statements)

References 241 publications

(306 reference statements)

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“…As a result, these outcomes are hardly amenable to systematization and classification. Moreover, the complexity of technologies tends increase in order to meet the main challenges of additive manufacturing: porosity due to powder materials use [ 74 ], residual stresses due to significant heating and cooling rates [ 75 ], the requirements for surface roughness [ 76 ] and tailoring the operational properties for different applications (namely bearing [ 77 ], magnetic [ 78 ], biomedical [ 79 , 80 ], refractory [ 19 ], etc.). At present, there are about 30 different metal additive manufacturing (MAM) processes.…”

Section: Classification Of the Mam Processes Used For Ti 2 ...mentioning

confidence: 99%

A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb

et al. 2023

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Titanium alloys based on orthorhombic titanium aluminide Ti2AlNb are promising refractory materials for aircraft engine parts in the operating temperature range from 600–700 °C. Parts made of Ti2AlNb-based alloys by traditional technologies, such as casting and metal forming, have not yet found wide application due to the sensitivity of processability and mechanical properties in chemical composition and microstructure compared with commercial solid-solution-based titanium alloys. In the last three decades, metal additive manufacturing (MAM) has attracted the attention of scientists and engineers for the production of intermetallic alloys based on Ti2AlNb. This review summarizes the recent achievements in the production of O-phase-based Ti alloys using MAM, including the analysis of the feedstock materials, technological processes, machines, microstructure, phase composition and mechanical properties. Powder bed fusion (PBF) and direct energy deposition (DED) are the most widely employed MAM processes to produce O-phase alloys. MAM provides fully dense, fine-grained material with a superior combination of mechanical properties at room temperature. Further research on MAM for the production of critical parts made of Ti2AlNb-based alloys can be focused on a detailed study of the influence of post-processing and chemical composition on the formation of the structure and mechanical properties, including cyclic loading, fracture toughness, and creep resistance.

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Section: Classification Of the Mam Processes Used For Ti 2 ...mentioning

confidence: 99%

A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb

et al. 2023

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“…As a result, the specimens produced by LPBF show a lower fatigue strength than conventionally produced material, which is a well-known phenomenon in many studies. [5,7,11,13,27] Eliminating the porous defects in the material is crucial to improve the fatigue strength of the components produced by LPBF. HIP with integrated heat treatment can modify the microstructure and densify the material simultaneously.…”

Section: Fatigue Tests and Failure Analysismentioning

confidence: 99%

Improving the Fatigue Strength of Laser Powder Bed‐Fused AISI M3:2 by Hot Isostatic Pressing

Qin

Herzog

Kaletsch

et al. 2022

steel research int.

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“…The relationship between porosity and mechanical properties was also studied by various researchers. They found that the porosity degrades the mechanical properties [12], [13] and, thus, limits the lifetime of a product [20].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity of Melt Pool Size and Porosity Appearing to Base Plate Preheating in Laser Powder Bed Fusion Process

Hassinie¹,

Chatti²,

Kolsi³

2022

AWET

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The base plate temperature ranks among the crucial building parameters whose effect on melt pool dimensions and porosity defects generation has not been sufficiently discussed in literature. In the current study, with the aim to explore the dependence between melt pool dimensions, porosity defects and base plate preheating, a 3-dimensional thermal finite element model is carried out to create IN718 single beads, at various base plate temperatures. The dimensions of the melt pool behave favourably with the base plate preheating. Indeed, the melt pool depth, width and length increase continuously with the heat of the base plate, from 20 °C to 500 °C. The melt pool width is more responsive to the base plate temperature than the melt pool depth. Numerical results also indicate that the melt dimensions become more responsive to the temperature of the base plate at a slower scan speed. The degree of porosity is predicted under multiple values of base plate temperature and the results show that porosity tends to disappear with further preheating of the base plate. A satisfying accordance between the numerical finding and the experimental results from literature is identified.

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A critical review on the effects of process-induced porosity on the mechanical properties of alloys fabricated by laser powder bed fusion

Cited by 110 publications

References 241 publications

A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb

A Review—Additive Manufacturing of Intermetallic Alloys Based on Orthorhombic Titanium Aluminide Ti2AlNb

Improving the Fatigue Strength of Laser Powder Bed‐Fused AISI M3:2 by Hot Isostatic Pressing

Sensitivity of Melt Pool Size and Porosity Appearing to Base Plate Preheating in Laser Powder Bed Fusion Process

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