Material science
Yaser Vahidshad; caren abrinia; Peyman aalimehr
Abstract
This research focused on investigating additive manufacturing factors using Selective Laser Melting (SLM) with maraging grade 300 steel powder via Taguchi method. The main objectives were to explore the influence of process parameters and achieve optimal levels. Experiments were exactly designed with ...
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This research focused on investigating additive manufacturing factors using Selective Laser Melting (SLM) with maraging grade 300 steel powder via Taguchi method. The main objectives were to explore the influence of process parameters and achieve optimal levels. Experiments were exactly designed with the assistance of Mini-Tab software. The study specifically targeted scanning speed, hatch distance, layer thickness, and scanning strategy for fabricating tensile samples. Comprehensive characterization using optical and scanning electron microscopes examined mechanical and microstructural properties. The analysis revealed that the optimal levels for achieving desirable results were as follows: scanning speed of 100 mm/s, layer thickness of 20 microns, hatch distance of 0.15 mm, and implementing the Stripe scanning strategy in the XY direction. The output results showed significant findings, with a final tensile strength of 951 MPa, porosity measured at 0.4%, and an impressive relative density of 99.6%. In conclusion, this research provides valuable insights into optimizing the selective laser melting process with maraging grade 300 steel, offering crucial knowledge about effective process parameters for obtaining optimal mechanical and microstructural properties in the additive manufacturing of tensile samples.
Structure
Yaser Vahidshad; Faegheh Soltanmohammad
Abstract
Many factors affect the quality of brazing process, including temperature, time, clearance, surface roughness and alloy elements. Actually, they influence on the formation of intermetallic compounds in brazed joints. Since intermetallic compounds are brittle, they considerably degrade the mechanical ...
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Many factors affect the quality of brazing process, including temperature, time, clearance, surface roughness and alloy elements. Actually, they influence on the formation of intermetallic compounds in brazed joints. Since intermetallic compounds are brittle, they considerably degrade the mechanical properties of joints. In this study, the mechanical strength and microstructural characterization of AISI 316 brazed joints with BNi2 filler metal in different temperature has been investigated. Brazing temperatures changed from 1050 °C, 1100 °C, 1150 °C and 1200 °C for a holding time of 60 min then, the influence of this variable on the brazing strength were examined. Tensile test samples were evaluated at room temperature and metallography samples and fractured tensile sample scanned by a microscope. The results showed that the higher brazing temperature leads to diffusion of boron element into base metal and less volume formation of intermetallic compound phase in the brazing joint and consequently more tensile strength
