In the powder bed fusion (PBF) process, a 3D shape is formed by the continuous stacking of very fine powder layers using computer-aided design (CAD) modeling data, following which laser irradiation can be used to fuse the layers forming the desired product. In this method, the main process parameters for manufacturing the desired 3D products are laser power, laser speed, powder form, powder size, laminated thickness, and laser diameter. Stainless steel (STS) 316L exhibits excellent strength at high temperatures, and is also corrosion resistant. Due to this, it is widely used in various additive manufacturing processes, and in the production of corrosion-resistant components with complicated shapes. In this study, rectangular specimens have been manufactured using STS 316L powder via the PBF process. Further, the effect of heat treatment at 800 °C on the microstructure and hardness has been investigated.

Main aspects of this study are to clarify igneous activity of igneous rocks, which is a member of various intrusives and volcanics exposed in the SE-zone of Ogcheon Geosynclinal belt, one of basement of Korean peninsula. Igneous rocks of study area along marginal area between SE-zone and C-zone of Ogcheon Geosynclinal belt consist of Pre-Cambrian orthogneiss, Triassic foliated granites and Namweon granites, Jurassic diorite-gabbro and granites, and Cretaceous granites and volcanics. Foliated granites in so-called Honam shear belt of study area is divided into four rock units based on the geologic age, mineralogy and texture : Daegang foliated granite, foliated hornblende biotite grandiorite, foliated biotite granodiorite and foliated two mica granite. Foliation of foliated granites generated by dextral strike slip movement at deep ductile shear zone. The individual synchronous plutons plottes on Harker diagram show mostly similar trend to the Daly's values. Each plots of the foliated granites, Jurassic granites and Cretaceous igneous rocks concentrate near trend of talc-alkali rock series on the AMF diagram. Igneous rocks of study area vary wide range in total REE content(83.27-377.49ppm) show LREE enriched than HREE in REE amount, and LREE have more steep negative slope in Eu(-) anomaly. From the date mentioned above, it is concluded the synchronous plutons which composed of several rock facies is considered to formed by differentiation of a series of magma. Geochronological episodes of igneous activity from early proterozoic to late Cretaceous between Jinan and Naju are two more Pre-Cambrian Orogenies, Songrim Disturbance, Daebo Orogeny and Bulkuksa Disturbance.