Widely used additive manufacturing technique for plastic materials is Fused Deposition Modelling (FDM). The FDM technology has gained interest in industry for a wide range of applications, especially today when large number of different materials on the market are available. There are many different manufacturers for the same FDM material where the difference in price goes up to 50%. This experimental study investigates possible difference in strength of the 3D printed PLA material of five different manufacturers. All specimens are 3D printed on Ultimaker S5 printer with the same printing parameters, and they are all the same colour.
Possibilities of regenerative heat treatment after prolonged exploitation under service conditions of low alloyed Cr-Mo-V cast steels are reported in published investigations. Considering this assumption that post service regenerative heat treatment could change microstructure and improve decreased mechanical properties after prolonged exploitation, heat resistant steamline steel 14MoV6-3 is investigated in this paper. Microstructure of post service regenerative heat treated steel 14MoV6-3 implicitly indicated increase of strength properties, but not toughness properties at same time. In order to investigate impact toughness properties, such as a crack initiation and propagation energy, following temperatures were selected: 20°C, 150°C, 400°C and 540°C (service temperature) for virgin, exploited and regenerative heat treated steamline steel 14MoV6-3. Further investigations related to possibilities of post service regeneration of exploited steel 14MoV6-3 should be directed to more adequate heat treatment cycle.
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