High temperature dry sliding wear behaviour of laser powder bed fused Inconel 718

Samuel, Calvin; Arivarasu, M.; Prabhu, T. Ram

doi:10.1016/j.addma.2020.101279

Cited by 29 publications

(18 citation statements)

References 51 publications

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“…The diameter of the X-ray beam spot is 2mm. The distance between the detector and sample for all the measured points was kept constantly at 39mm and the penetration depth of the X-ray was 8µm for IN718 alloy [6]. The residual stresses were measured at eight different points on the top and lateral side surfaces by varying the orientations of the samples with respect to the incident direction of the X-ray.…”

Section: Residual Stress Measurementmentioning

confidence: 99%

“…The austenite phase is strengthened by precipitating γ' (Ni (Al, Ti)) and γ'' (Ni 3 Nb) phases. However, it also forms some harmful intermetallic phases at the time of processing such as δ (Ni 3 Nb) with orthorhombic DO a structure and laves (Ni, Fe, Cr) 2 (Nb, Mo, Ti) phases with a hexagonal crystal structure due to more segregation of Nb and Mo elements [4][5][6][7]. The desired properties of the alloy can be restored by eliminating the intermetallic phases and increasing the presence of strengthening phases [8].…”

Section: Introductionmentioning

confidence: 99%

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Attainment of favorable microstructure for residual stress reduction through high-temperature heat treatment on additive manufactured inconel 718 alloy

Jebaraj

2022

Int J Adv Manuf Technol

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The mitigation of residual stress in additive manufactured metal parts through postheat treatment helps to enhance life during service. The present work aims to investigate the effect of the high-temperature heat treatment at 1065°C on microstructural changes, residual stress patterns, and hardness of Inconel 718 metal blocks fabricated through the Laser powder bed fusion (L-PBF) process. The non-destructive X-ray diffraction technique known as cos α method was used to measure the surface residual stress by capturing the Debye ring. It was found that the existence of columnar dendrites with laves phases in the interdendritic region along the building direction was dissolved after heat treatment. The resultant microstructure showed homogeneous equiaxed grains with the formation of annealing twins along with strengthening phases (γ' and γ'') and tiny metal carbides on the grain boundaries. Further, the residual stress magnitude in the as-built sample was found to be 77% higher on the corners compared to the center region of the top surface. The average value of residual stress on the top surface was found to be 35.5% lesser than the lateral side surface of the sample. It was observed that the distribution of residual stress is not uniform in as-built condition. The heattreated sample showed uniform distribution of compressive residual stresses in all the locations. This phenomenon happened due to the increase in diffusion of atoms present in the high-stress regions migrated to low-stress regions till attain their equilibrium condition.During this action, the stresses present in the grain interiors were altered considerably and resulted in complete recrystallization with the precipitation of more strengthening phases and annealing twins. The high-temperature post-heat treatment also affects the hardness leads to 23.03% increase in average microhardness mainly induced resistance to dislocation motion by precipitation of strengthening phases in the γ matrix.

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Section: Residual Stress Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Attainment of favorable microstructure for residual stress reduction through high-temperature heat treatment on additive manufactured inconel 718 alloy

Jebaraj

2022

Int J Adv Manuf Technol

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Section: Introductionmentioning

confidence: 99%

“…The peaks for laves phases present in the interdendritic regions of as-built samples are not visible because of low volume fractions as compared to other phases. The crystallite size was calculated using Scherrer equation(6) and, observed that the dislocation density of heat-treated samples was more as compared to as-built samples. The dislocation density and microstrain were calculated with equation(7).…”

mentioning

confidence: 99%

Attainment of Favorable Microstructure for Residual Stress Reduction Through High-Temperature Heat Treatment on Additive Manufactured Inconel 718 Alloy

Jebaraj

2022

Preprint

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The mitigation of residual stress in additive manufactured metal parts through post-heat treatment helps to enhance life during service. The present work aims to investigate the effect of the high-temperature heat treatment at 1065°C on microstructural changes, residual stress patterns, and hardness of Inconel 718 metal blocks fabricated through the Laser powder bed fusion (L-PBF) process. The non-destructive X-ray diffraction technique known as cos α method was used to measure the surface residual stress by capturing the Debye ring. It was found that the existence of columnar dendrites with laves phases in the interdendritic region along the building direction was dissolved after heat treatment. The resultant microstructure showed homogeneous equiaxed grains with the formation of annealing twins along with strengthening phases (γ’ and γ’’) and tiny metal carbides on the grain boundaries. Further, the residual stress magnitude in the as-built sample was found to be 77% higher on the corners compared to the center region of the top surface. The average value of residual stress on the top surface was found to be 35.5% lesser than the lateral side surface of the sample. It was observed that the distribution of residual stress is not uniform in as-built condition. The heat-treated sample showed uniform distribution of compressive residual stresses in all the locations. This phenomenon happened due to the increase in diffusion of atoms present in the high-stress regions migrated to low-stress regions till attain their equilibrium condition. During this action, the stresses present in the grain interiors were altered considerably and resulted in complete recrystallization with the precipitation of more strengthening phases and annealing twins. The high-temperature post-heat treatment also affects the hardness leads to 23.03% increase in average microhardness mainly induced resistance to dislocation motion by precipitation of strengthening phases in the γ matrix.

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“…4 Generally, wear provides an adverse effect on the metallic materials performance, and is still challenging in many industries. 5 In recent years, researchers worldwide have been attempting various methods and materials to overcome this constraint on metallic materials. Surface modication is the widely utilized method to protect and improve the wear resistance of the metallic material surface.…”

Section: Introductionmentioning

confidence: 99%

Surface alloying of FeCoCrNiMn particles on Inconel-718 using plasma-transferred arc technique: microstructure and wear characteristics

et al. 2021

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High temperature dry sliding wear behaviour of laser powder bed fused Inconel 718

Cited by 29 publications

References 51 publications

Attainment of favorable microstructure for residual stress reduction through high-temperature heat treatment on additive manufactured inconel 718 alloy

Attainment of favorable microstructure for residual stress reduction through high-temperature heat treatment on additive manufactured inconel 718 alloy

Attainment of Favorable Microstructure for Residual Stress Reduction Through High-Temperature Heat Treatment on Additive Manufactured Inconel 718 Alloy

Surface alloying of FeCoCrNiMn particles on Inconel-718 using plasma-transferred arc technique: microstructure and wear characteristics

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