Abstract
Maraging steels are used in several industries, namely in the molds industry. The determination of fatigue crack propagation resistance in 18Ni300 maraging steel at the Paris regime is a vital issue for safety-relevant components, which are designed to work for a large number of loading cycles before periodic inspections. The main goal of this work is to analyze the influence of the deposition plane angle and saline corrosion on fatigue crack growth in maraging steel samples produced by Laser Powder Bed Fusion (LPBF). The crack closure parameter was used in order to analyze the different fatigue crack growth behaviors, as well as the metallographic, hardness, fractography and corrosion/oxidation analysis. From this work, the main achievement was that the deposition plane angle did not reveal a notable influence in the fatigue crack growth behavior for the fatigue tests unsubmitted to saline corrosion. On the other hand, the fatigue crack growth behavior for the tests under saline corrosion showed an increase in the crack closure parameter due to the appearance of the crack closure induced by oxides, which reduced the fatigue crack growth speed. This phenomenon depends on the deposition plane angle, which controls the martensite amount and consequently controls the level of corrosion/oxidation.
Highlights
Laser powder bed fusion (LPBF) allows the generation of complex shape components with a strategy of layer-by-layer building, resulting in lighter components [1]
Maraging steels are used in the aerospace and molds industries due to their good properties of high strength, high toughness, resistance to crack propagation and good weldability [2,3]
The characteristic tooling inserts of the molds industry could have cooling channels and components with high geometrical complexity that enable the use of LPBF
Summary
Laser powder bed fusion (LPBF) allows the generation of complex shape components with a strategy of layer-by-layer building, resulting in lighter components [1]. Since it is an emerging technology used in the automotive, aerospace and molds industries, it requires deep study. The characteristic tooling inserts of the molds industry could have cooling channels and components with high geometrical complexity that enable the use of LPBF. This is justified since the use of the LPBF process allows the creation of these complex geometries that are impossible to archive by traditional methods [4,5]. The molds for injection suffer cyclic loadings throughout the lifespan; for this reason, fatigue crack growth behavior needs to be studied
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