论文类型：期刊论文
发表刊物：Virtual and Physical Prototyping
收录刊物：SCI
学科门类：工学
一级学科：机械工程
文献类型：J
关键字：Multi-laser powder bed fusion; Selective laser melting; Overlap region; Nickel-based superalloy; Mechanical properties
DOI码：10.1080/17452759.2022.2142802
发表时间：2022-11-11
影响因子：10.962
摘要：During the multi-laser powder bed fusion (ML-PBF) process, the quality of the overlap region is essential to ensure the integrity between different laser scanning areas. Here, six different overlap region widths (ORWs) are selected to systematically investigate the effect of ORWs on densification, metallurgical defects, crystalline microstructure, and mechanical performance of the Hastelloy X samples processed by multi-laser powder bed fusion. ORWs are set to 0, 50, 100, 150, 200, and 250 μm, respectively. With an increment in ORW, the porosity gradually increases from 0.01% to 7.08%. Inversely, microcracks are reduced with increasing the ORWs due to the smaller width-to-depth ratio of the melt pools and the increased degree of recrystallisation. All the samples display equivalent ultimate tensile strength of ∼880 MPa, while the elongations at break of the overlap samples are 3.5%−10.5% lower than that of the single-laser processed one (28.4%). The inferior ductility is ascribed to the decreased densification in the overlap regions, of which the adverse effect can be minimised when an ORW of 150 μm is utilised. This work is anticipated to provide efficient reference and theoretical guidance for the large-size nickel-based superalloy components fabricated by ML-PBF.
发布期刊链接：https://doi.org/10.1080/17452759.2022.2142802