2017
DOI: 10.1108/rpj-12-2015-0192
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Mechanical properties and microstructural characterization of selective laser melted 17-4 PH stainless steel

Abstract: Purpose-The purpose of this paper is to understand the effect of four different factors: building orientation, heat treatment (solution annealing and aging), thermal history and process parameters on the mechanical properties and microstructural features of 17-4 precipitation hardening (PH) stainless steel (SS) parts produced using selective laser melting (SLM). Design/methodology/approach-Various sets of test samples were built on a ProX 100™ SLM system under argon environment. Characterization studies were c… Show more

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Cited by 141 publications
(73 citation statements)
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“…The finer microstructure in multibuilt DLD AM specimens contributed to lower elongation to failure, as well as higher Vicker hardness, yield strength, and ultimate strength . However, the tensile properties of specimens fabricated using L‐PBF process were not significantly influenced by the interlayer time interval, as reported in Mahmoudi et al The findings from these studies suggest that the DLD parts may be more sensitive to the interlayer time interval as compared with the L‐PBF ones. However, the effect of L‐PBF part's geometry and size on the microstructure and mechanical properties may still be significant, which requires further investigation.…”
Section: Effects Of Geometry and Sizementioning
confidence: 66%
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“…The finer microstructure in multibuilt DLD AM specimens contributed to lower elongation to failure, as well as higher Vicker hardness, yield strength, and ultimate strength . However, the tensile properties of specimens fabricated using L‐PBF process were not significantly influenced by the interlayer time interval, as reported in Mahmoudi et al The findings from these studies suggest that the DLD parts may be more sensitive to the interlayer time interval as compared with the L‐PBF ones. However, the effect of L‐PBF part's geometry and size on the microstructure and mechanical properties may still be significant, which requires further investigation.…”
Section: Effects Of Geometry and Sizementioning
confidence: 66%
“…The geometry and size effect can be studied to a certain extent by varying the interlayer time interval in AM specimens, which can be achieved by fabricating a different number of specimens on the build plate . Finer microstructure caused by higher cooling/solidification rates has been observed for DLD AM 316L stainless steel specimens with longer interlayer time (ie, multiple parts fabricated on a build plate), when compared with specimens with shorter interlayer time (ie, single specimen fabricated on a build plate).…”
Section: Effects Of Geometry and Sizementioning
confidence: 99%
“…However, statistically, there is no improvement in HCF resistance of AM 17‐4 PH SS after heat treatment regardless of the build orientation. For the wrought 17‐4 PH SS, the same heat treatment (ie, Condition H900) can significantly improve the HCF performance of this alloy due to the formation of precipitates in the material matrix, which enhances the resistance to crack nucleation . This indicates that the fatigue failure mechanism for AM 17‐4 PH SS specimens that contain large LOF defects is different than that of wrought 17‐4 PH SS.…”
Section: Experimental Datamentioning
confidence: 99%
“…In the L‐PBF process, the laser‐powder interactions are largely affected by processing conditions such as laser power, scan speed, hatch spacing, and layer thickness . In general, the above processing conditions along with powder characteristics such as size, shape, and purity significantly determine the density, microstructures, and properties obtained from L‐PBF parts . In our former work, a comprehensive study was performed to understand the role powder characteristics such as powder type, shape, and size along with L‐PBF processing conditions on densification, mechanical properties, and microstructure of 17‐4 PH stainless steel L‐PBF parts.…”
Section: Introductionmentioning
confidence: 99%
“…[1][2][3][4][5][6][7][8][9][10] In general, the above processing conditions along with powder characteristics such as size, shape, and purity significantly determine the density, microstructures, and properties obtained from L-PBF parts. [6][7][8][11][12][13][14][15][16][17] In our former work, 18,19 a comprehensive study was performed to understand the role powder characteristics such as powder type, shape, and size along with L-PBF processing conditions on densification, mechanical properties, and microstructure of 17-4 PH stainless steel L-PBF parts. It was found that the % theoretical density, ultimate tensile strength, and hardness of L-PBF parts are sensitive to L-PBF processing conditions and starting powder shape, size, and type.…”
Section: Introductionmentioning
confidence: 99%