scholarly journals Effect of Scanning and Support Strategies on Relative Density of SLM-ed H13 Steel in Relation to Specimen Size

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 239 ◽  
Author(s):  
Tomasz Kurzynowski ◽  
Wojciech Stopyra ◽  
Konrad Gruber ◽  
Grzegorz Ziółkowski ◽  
Bogumiła Kuźnicka ◽  
...  
Keyword(s):  
Relative Density ◽  
Scanning Speed ◽  
Variable Cross Section ◽  
Parameters Optimization ◽  
Variable Cross ◽  
H13 Steel ◽  
H13 Tool Steel ◽  
Aisi H13 ◽  
Aisi H13 Tool Steel ◽  
Selection Of

Standard experimental research works are aimed at optimization of Selective Laser Melting (SLM) parameters in order to produce material with relative density over 99% and possibly the highest scanning speed. Typically, cuboidal specimens with arbitrarily selected dimensions are built. An optimum set of parameters, determined on such specimens, is used for building parts with variable cross-section areas. However, it gives no guarantee that the density of variable-section parts produced with so selected parameters will be as high as that of the specimens measured during the parameters optimization process. The goal of this work was to improve the process of SLM parameter selection according to the criterion of maximum relative density, based on the example of AISI H13 tool steel (1.2344). A selection method of scanning strategy ensuring relative density of parts over 99%, irrespective of their dimensions, was determined. The specimens were produced using several variants of support structures. It was found that proper selection of the support strategy prevents development of columnar pores.

scholarly journals Influence of Selective Laser Melting Technology Process Parameters on Porosity and Hardness of AISI H13 Tool Steel: Statistical Approach

Materials ◽  
2021 ◽  
Vol 14 (20) ◽  
pp. 6052
Author(s):  
Filip Véle ◽  
Michal Ackermann ◽  
Václav Bittner ◽  
Jiří Šafka
Keyword(s):  
Selective Laser Melting ◽  
Tool Steel ◽  
Scanning Speed ◽  
Technological Parameters ◽  
Laser Melting ◽  
H13 Tool Steel ◽  
Aisi H13 ◽  
Beam Parameters ◽  
The Impact ◽  
Aisi H13 Tool Steel

The correct setting of laser beam parameters and scanning strategy for Selective Laser Melting (SLM) technology is a demanding process. Usually, numerous experimental procedures must be taken before the final strategy can be applied. The presented work deals with SLM technology and the impact of its technological parameters on the porosity and hardness of AISI H13 tool steel. In this study, we attempted to map the dependency of porosity and hardness of the tested tool steel on a broad spectrum of scanning speed–-laser power combinations. Cubic samples were fabricated under parameters defined by full factorial DOE, and metallurgic specimens were prepared for measurement of the two studied quantities. The gathered data were finally analyzed, and phenomenological models were proposed. Analysis of the data revealed a minimal energy density of 100.3 J/mm3 was needed to obtain a dense structure with a satisfactory hardness level. Apart from this, the model may be used for approximation of non-tested combinations of input parameters.

scholarly journals Process-Structure-Property Relationships of AISI H13 Tool Steel Processed with Selective Laser Melting

Materials ◽  
2019 ◽  
Vol 12 (14) ◽  
pp. 2284 ◽  
Author(s):  
Morteza Narvan ◽  
Kassim S. Al-Rubaie ◽  
Mohamed Elbestawi
Keyword(s):  
Relative Density ◽  
Selective Laser Melting ◽  
Tool Steel ◽  
Crack Formation ◽  
Dendritic Structure ◽  
Laser Melting ◽  
Scanning Strategy ◽  
H13 Tool Steel ◽  
Aisi H13 ◽  
Aisi H13 Tool Steel

Due to a good combination of high hardness, wear resistance, toughness, resistance to high operating temperatures, and fairly low material cost, AISI H13 tool steel is commonly used in the manufacture of injection molds. Additive manufacturing (AM) such as selective laser melting (SLM), due to the layer-wise nature of the process, offers substantial geometric design freedom in comparison with conventional subtractive manufacturing methods, thereby enabling a construction of complex near-net shape parts with internal cavities like conformal cooling channels. The quality of SLM-manufactured parts mainly depends on the part geometry, build orientation and scanning strategy, and processing parameters. In this study, samples of H13 tool steel with a size of 10 × 10 × 15 mm3 were SLM-manufactured using a laser power of 100, 200, and 300 W; scanning speed of 200, 400, 600, 800, 1000, and 1200 mm/s; and hatch spacing of 80 and 120 µm. A constant layer thickness of 40 µm, 67° scanning rotation between subsequent layers, and a stripe scanning strategy were maintained during the process. The samples were built considering a preheating of 200 °C. The relative density, surface roughness, crack formation, microstructure, and hardness were evaluated. The relative density is shown to increase with increasing the volumetric energy density up to a value of about 60 J/mm3 and then no significant increase can be pointed out; the maximum relative density of 99.7% was obtained. A preheating of 200 °C generally aids to increase the relative density and eliminate the crack formation. The microstructure of built samples shows fine equiaxed cellular-dendritic structure with martensite and some retained austenite. The microhardness of the as-built samples was found to vary from 650 to 689 HV 0.2, which is comparable to a conventionally produced H13 tool steel.

The hydro-abrasive erosion wear behavior of duplex-treated surfaces of AISI H13 tool steel

2014 ◽  
Vol 57 (5) ◽  
pp. 1040-1051 ◽  
Author(s):  
Mumin Tutar ◽  
Hakan Aydin ◽  
Ali Durmus ◽  
Ali Bayram ◽  
Kurtulus Yigit
Keyword(s):  
Tool Steel ◽  
Wear Behavior ◽  
Erosion Wear ◽  
H13 Tool Steel ◽  
Abrasive Erosion ◽  
Aisi H13 ◽  
Aisi H13 Tool Steel

Effect of compound layer on the corrosion behavior of plasma nitrided AISI H13 tool steel

2019 ◽  
Vol 6 (5) ◽  
pp. 056412 ◽  
Author(s):  
Zahra Andalibi Fazel ◽  
Hassan Elmkhah ◽  
Meisam Nouri ◽  
Arash Fattah-alhosseini
Keyword(s):  
Corrosion Behavior ◽  
Tool Steel ◽  
Compound Layer ◽  
H13 Tool Steel ◽  
Aisi H13 ◽  
Aisi H13 Tool Steel

Influence of overlap between the laser beam tracks on surface quality in laser polishing of AISI H13 tool steel

2012 ◽  
Vol 14 (4) ◽  
pp. 425-434 ◽  
Author(s):  
Abdullah M. Khalid Hafiz ◽  
Evgueni V. Bordatchev ◽  
Remus O. Tutunea-Fatan
Keyword(s):  
Laser Beam ◽  
Surface Quality ◽  
Tool Steel ◽  
Laser Polishing ◽  
H13 Tool Steel ◽  
Aisi H13 ◽  
Aisi H13 Tool Steel
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