Corrosion Behavior of the S136 Mold Steel Fabricated by Selective Laser Melting

Abstract

The selective laser melting (SLM) method has a great potential for fabricating injection mold with complex structure. However, the microstructure and performance of the SLM molds show significantly different from those manufactured by traditional technologies. In this study, the microstructure, hardness and especially corrosion behavior of the samples fabricated by SLM and casting were investigated. The XRD results exhibit that the γ-Fe phase is only obtained in the SLM parts, and the α-Fe peak slightly moves to low diffraction angle compared with casting counterparts. Due to the rapid cooling rate, the SLM samples have fine cellular microstructures while the casting ones have coarse grains with obvious elements segregation. Besides, the SLM samples show anisotropy, hardness of side view and top view are 48.73 and 50.31 HRC respectively, which are 20% higher than that of casting ones. Corrosion results show that the SLM samples have the better anti-corrosion resistance (in a 6% FeCl 3 solution for 48 h) but the deeper corrosion pits than casting ones. Finally, the performance of the SLM molds could meet the requirement of injecting production. Moreover, the molds especially present a significant decrease (20%) of cooling time and increases of cooling uniformity due to the customized conformal cooling channels.

Selective laser melting high-performance ZrC-reinforced tungsten composites with tailored microstructure and suppressed cracking susceptibility

“…3c). It could be speculated the irregular surface of WZC-1 was mainly caused by the excess addition of ZrC nano-particles, which could significantly increase the viscosity of composites melt and dramatically decrease the overall rheological performance, and then cause the melt to spheroidize rather than spread smoothly on the underlying surface [19]. A homologous result was also reported during SLM TiC/Ti composites [20].…”

Effect of Trace Addition of Ceramic on Microstructure Development and Mechanical Properties of Selective Laser Melted AlSi10Mg Alloy

“…Selective laser melting (SLM) is a newly developed powder bed technique allowing for the rapid fabrication of three-dimensional shapes with complex geometries. It uses a moving laser beam that selectively fuses and consolidates thin layers of a loose powder based on computer-aided design (CAD) models [7][8][9][10]. It has significant advantages in saving manufacturing time, production cost and reducing personnel error rate [11,12].…”

Corrosion Behavior of Selective Laser Melted Ti-6Al-4V in 0.1 mol/L NaOH Solution

“…This can be attributed to the higher Cr 2 O 3 content Coatings 2023, 13, 150 2 of 13 and lower donor/acceptor density in the passive film [9]. In a 6% FeCl 3 solution, a 316L stainless steel prepared by SLM had a better corrosion resistance than an as-cast 316L alloy, although the corrosion pit was deeper [10]. This is closely correlated with the more rapid formation of a passive film on the SLMed 316L stainless steel.…”