Microstructural effects on the tensile and fracture behavior of selective laser melted H13 tool steel under varying conditions

Lee, Jungsub; Choe, Jungho; Park, Junhyeok; Yu, Juan; Kim, Sangshik; Jung, Im Doo; Sung, Hyokyung

doi:10.1016/j.matchar.2019.109817

Cited by 78 publications

(39 citation statements)

References 35 publications

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“…In the as-built state, the segregation on grain boundaries forms V-rich carbides, as shown in Figure 13. This was already highlighted by Fonseca et al [29] based on scanning transmission electron microscopy (STEM) investigations and by Lee et al based on atom probe tomography (APT) [32] . The enrichment of elements at grain boundaries, mostly carbon as an austenite stabilizer, has to be considered to rationalize the appearance of γ-phase, as shown in Figure 8 and 10b.…”

Section: Parameter Optimizationmentioning

confidence: 82%

“…Type Processibility H11 [50] Hot work steel Processible at 500 C H13 [32] Hot work steel Processible at 200 C M2 [51,52] High-speed steel Cracked at 100 and 180 C, Crack-free at 200 C 56NiCrMoV7 [53] Hot work steel Cracked at RT FeCrV10 [53] Wear resistant steel Cracked at 300 C HS6-5-8-3 [54] High-speed steel Cracked at RT, crack-free at 500 C FeCrMoVC [55] Wear resistant steel Processible at 500 C M50 [56] High-speed steel Cracked at RT, crack-free at 200 C X110CrMoVAl8-2 [55] Cold work steel Processible at 240 C scanning electron microscopy (SEM) and based on thermodynamic calculations using a Scheil-Gulliver model, they derived important findings. The schematic in Figure 4 shows the solidification process during manufacturing proposed in their work.…”

Section: Methodsmentioning

confidence: 99%

“…Mertens et al [31] manufactured H13 at room temperature (RT), at 200 and 400 C. Investigations revealed a low yield stress and minor total elongation for all samples as well as a high volume fraction of γ-phase in samples manufactured at RT and 200 C. Lee et al [32] showed similar mechanical properties, being characterized by low yield stresses and low elongations at fracture in tensile tests.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

See 2 more Smart Citations

Hot Work Tool Steel Processed by Laser Powder Bed Fusion: A Review on Most Relevant Influencing Factors

Das

Gridin

et al. 2021

Adv Eng Mater

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Section: Parameter Optimizationmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Mechanical Propertiesmentioning

confidence: 99%

See 1 more Smart Citation

Hot Work Tool Steel Processed by Laser Powder Bed Fusion: A Review on Most Relevant Influencing Factors

Das

Gridin

et al. 2021

Adv Eng Mater

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“…Other processing parameters also affect the microstructure properties of AM H13. For instance, Lee et al [217] show an epitaxial growth in the building direction for the H13 tool steels where columnar grains mostly comprise of martensite with a low amount of retained austenite, together with MC (V-rich) and M 2 C (Mo-rich) carbides (Fig. 18).…”

Section: H13mentioning

confidence: 99%

Additive manufacturing of steels: a review of achievements and challenges

et al. 2020

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Metal additive manufacturing (AM), also known as 3D printing, is a disruptive manufacturing technology in which complex engineering parts are produced in a layer-by-layer manner, using a high-energy heating source and powder, wire or sheet as feeding material. The current paper aims to review the achievements in AM of steels in its ability to obtain superior properties that cannot be achieved through conventional manufacturing routes, thanks to the unique microstructural evolution in AM. The challenges that AM encounters are also reviewed, and suggestions for overcoming these challenges are provided if applicable. We focus on laser powder bed fusion and directed energy deposition as these two methods are currently the most common AM methods to process steels. The main foci are on austenitic stainless steels and maraging/precipitation-hardened (PH) steels, the two so far most widely used classes of steels in AM, before summarising the state-of-the-art of AM of other classes of steels. Our comprehensive review highlights that a wide range of steels can be processed by AM. The unique microstructural features including hierarchical (sub)grains and fine precipitates induced by AM result in enhancements of strength, wear resistance and corrosion resistance of AM steels when compared to their conventional counterparts. Achieving an acceptable ductility and fatigue performance remains a challenge in AM steels. AM also acts as an intrinsic heat treatment, triggering ‘in situ’ phase transformations including tempering and other precipitation phenomena in different grades of steels such as PH steels and tool steels. A thorough discussion of the performance of AM steels as a function of these unique microstructural features is presented in this review.

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“…Irregular pores located in the vicinity of the part surface are due to partially melted/ sintered/entrapped metallic powder particles, which stick to and agglomerate on the outer edge of the melt pool. These residual powders are associated with the presence of complex voids, which can be distinguished from other types of defects [52,53]. The specific process parameters of Sample 2 (i.e., higher power, lower speed, smaller hatching distance) lead to higher energy density, which leads to the accumulation of more heat during the printing process.…”

Section: Resultsmentioning

confidence: 99%

Mapping Spatial Distribution of Pores in an Additively Manufactured Gold Alloy Using Neutron Microtomography

et al. 2021

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A crucial criterion for the quality of the additively manufactured parts is the porosity content for achieving an acceptable final relative density. In addition, for jewelry applications, visible pores are unacceptable at or in the vicinity of the surface. In this study, non-destructive 3D neutron microtomography is applied to map the spatial distribution of pores in additively manufactured red-gold samples. The 3D imaging assessment underlines the high relative density of the printed red-gold sample and indicates residual pore sizes are predominantly below the limit of concern for jewelry applications. The 3D maps of pores within printed samples highlight the effect of the scanning strategy on the final quality and location of pores in the printed samples. These results confirm that neutron microtomography is a novel and precise tool to characterize residual porosity in additively manufactured gold alloys and other higher-Z materials where such investigation using other non-destructive methods (such as X-rays) is challenging due to the limited penetration depth.

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Microstructural effects on the tensile and fracture behavior of selective laser melted H13 tool steel under varying conditions

Cited by 78 publications

References 35 publications

Hot Work Tool Steel Processed by Laser Powder Bed Fusion: A Review on Most Relevant Influencing Factors

Hot Work Tool Steel Processed by Laser Powder Bed Fusion: A Review on Most Relevant Influencing Factors

Additive manufacturing of steels: a review of achievements and challenges

Mapping Spatial Distribution of Pores in an Additively Manufactured Gold Alloy Using Neutron Microtomography

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