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Study on forming process and performance of nano-La2O3 reinforced tungsten-based composites by selective laser melting
Wei, Shenyu1,2; Li, Hongbo1,2
2024-12-01
摘要In this study, La2O3 nanoparticles were incorporated into a tungsten (W) matrix to enhance the microstructure and properties of pure W. The selective laser melting (SLM) process for W-2wt% La2O3 was optimized, and the influence of SLM processing parameters on the relative density and internal defects of the samples was examined. Challenges such as uneven powder layering and layer-by-layer thickening during the SLM process were addressed by incorporating a homogeneous material support formed with low laser energy density beneath the sample. This approach widened the process window for sample formation, resulting in a 2.38 % increase in the average relative density of supported samples compared to unsupported ones. With optimized parameters of 240W laser power, 200 mm/s scanning speed, and 80 mu m hatch spacing, the sample achieved a relative density of 98.32 % with minimal internal pores, though some microcracks remained. Further investigation revealed that surface roughness decreased with increasing laser power and scanning speed. High laser power combined with low scanning speed yielded good surface quality. Under conditions of high relative density (over 96 %), samples processed with low laser power and high scanning speed (200W, 200 mm/s) exhibited fine and uniform grain morphology, few internal defects, and excellent mechanical properties, with a microhardness of 474HV and a compressive strength of 2237 MPa.
关键词Selective laser melting W-La2O3 composites Mechanical properties
DOI10.1016/j.matchemphys.2024.129962
发表期刊MATERIALS CHEMISTRY AND PHYSICS
ISSN0254-0584
卷号328页码:9
通讯作者Li, Hongbo(lihongbo@cigit.ac.cn)
收录类别SCI
WOS记录号WOS:001319344800001
语种英语