Heat treatment and properties of a hot work tool steel fabricated by additive manufacturing

Deirmina, Faraz; Peghini, Nicola; AlMangour, Bandar; Grzesiak, Dariusz; Pellizzari, M.

doi:10.1016/j.msea.2019.03.027

Cited by 135 publications

(85 citation statements)

References 32 publications

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“…The darker areas, showing a more intense response to etching, display a more elongated structure consisting of partially tempered martensite. This is further confirmed by the different microhardness measured in these two areas of 662 ± 14 HV0.1 and 604 ± 12 HV0.1 for bright and dark regions, respectively . The laser tracks morphologies are visible also in the SEM image (Figure b,c), showing the presence of columnar and equiaxed/cellular structure in the vicinity of melt pool boundaries (arrows).…”

Section: Resultssupporting

confidence: 66%

“…The darker areas show the presence of very fine precipitated Cr, V, and Mo rich carbides at the cell boundaries; this is ascribed to the tempering effect (Figure d). Moreover, the microsegregation of C and other alloying elements causes the stabilization of RA at the cell boundaries which was reported in the previous work of the authors …”

Section: Resultssupporting

confidence: 64%

“…Despite the higher density, the hardness of the sample fabricated at 300 J mm −3 is slightly lower than that at 100 J mm −3 due to the stronger partial tempering occurring during L‐PBF. Moreover, also the increasing fraction of RA by higher energy density plays a significant role on the hardness …”

Section: Resultsmentioning

confidence: 99%

“…The authors of this article found that the amount of RA increases using higher energy density . They evidenced the inhomogeneous microhardness along the building direction due to the thermal interaction between the melt pool and the already solidified layer that produces a partial tempering effect.…”

Section: Introductionmentioning

confidence: 89%

“…Double tempering for 2 h + 2 h was performed at 625 and 650 °C for quenched and AB samples, respectively. Selecting different temperatures was meant to achieve nearly similar hardness for both QT and T samples according to tempering curves …”

Section: Methodsmentioning

confidence: 99%

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Fracture Toughness of a Hot Work Tool Steel Fabricated by Laser‐Powder Bed Fusion Additive Manufacturing

Pellizzari

Furlani

Deirmina

et al. 2019

steel research int.

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The fracture toughness of AISI H13 tool steel, additively manufactured by laser powder bed fusion (L-PBF) technique, is studied. The influence of the building direction on fracture toughness is investigated on small notched bending samples heat treated according to two different thermal cycles, namely, quenching and tempering (QT) and only tempering (T). The notch is electrodischarge machined parallel (P || ), perpendicular (P ⊥ ), and longitudinal (L) to the building direction. Both heat treatments, even if to a different extent, delete the as-built (AB) microstructure, producing secondary carbides precipitation in the martensitic matrix. The microstructure of the directly tempered parts is finer than the quenched and tempered ones. The fracture toughness increases moving from P ⊥ to P || . The T samples show a higher apparent fracture toughness in the P || , despite the higher hardness. Secondary cracks formation allows reducing the main crack opening driving force increasing the fracture toughness in P || samples. This effect is more pronounced in T samples where the stronger precipitation of carbides at the prior melt boundaries promotes secondary cracks. Moreover, in P || samples the laser tracks act as barriers to crack propagation and as stress dissipators.

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Section: Resultssupporting

confidence: 66%

Section: Resultssupporting

confidence: 64%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 89%

Section: Methodsmentioning

confidence: 99%

See 3 more Smart Citations

Fracture Toughness of a Hot Work Tool Steel Fabricated by Laser‐Powder Bed Fusion Additive Manufacturing

Pellizzari

Furlani

Deirmina

et al. 2019

steel research int.

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Microstructures of Metallic Materials from Additive Manufacturing

COLIN

2023

Additive Manufacturing of Metal Alloys 2

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Effects of Powder Atomization Route and Post‐Processing Thermal Treatments on the Mechanical Properties and Fatigue Resistance of Additively Manufactured 18Ni300 Maraging Steel

2021

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In this work the effect of microstructural homogenization and solution annealing prior to ageing on mechanical properties and fatigue resistance of 18Ni300 maraging steel parts processed by laser powder bed fusion (L‐PBF), using two different feedstock powders with different N and O contents is investigated. The static mechanical properties are not significantly affected by the selection of the different feedstock powders. This is ascribed to the extremely fine size of the nonmetallic inclusions, characteristic of L‐PBF process, even by using feedstock powders containing higher O and N contents. The tensile properties in both “directly aged,” and “homogenized, solution annealed and aged” samples are comparable. The tensile strength and ductility are slightly improved compared with the vacuum melted wrought counterparts. The dynamic mechanical properties are affected by the O and N contents of the powders. Heat treatment schedule imposed a significant effect on the fatigue properties. The obtained fatigue strength in directly aged samples is already comparable to the wrought counterparts. Fatigue resistance is improved by using feedstock powders with lower oxygen and nitrogen levels. Proper homogenization heat treatments prior to ageing led to a further improvement of fatigue strength because of the elimination of intercellular microsegregation.

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Heat treatment and properties of a hot work tool steel fabricated by additive manufacturing

Cited by 135 publications

References 32 publications

Fracture Toughness of a Hot Work Tool Steel Fabricated by Laser‐Powder Bed Fusion Additive Manufacturing

Fracture Toughness of a Hot Work Tool Steel Fabricated by Laser‐Powder Bed Fusion Additive Manufacturing

Microstructures of Metallic Materials from Additive Manufacturing

Effects of Powder Atomization Route and Post‐Processing Thermal Treatments on the Mechanical Properties and Fatigue Resistance of Additively Manufactured 18Ni300 Maraging Steel

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