Numerical investigation into laser-based powder bed fusion of cantilevers produced in 300-grade maraging steel

被引:18
作者
De Baere, David [1 ]
Moshiri, Mandana [1 ]
Smolej, Lukasz [1 ]
Hattel, Jesper H. [1 ]
机构
[1] Tech Univ Denmark, Dept Mech Engn, Prod Torvet,Bldg 425, DK-2800 Lyngby, Denmark
关键词
LPBF; Maraging steel; Numerical modelling; Residual stress; Laser absorption coefficient; FINITE-ELEMENT-ANALYSIS; MECHANICAL-PROPERTIES; MICROSTRUCTURAL EVOLUTION; AGING TIME; TEMPERATURE; PREDICTION; SIMULATION; DISTORTION; BEHAVIOR; TRANSFORMATION;
D O I
10.1016/j.addma.2021.102560
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Laser-based powder bed fusion of 300-grade maraging steel allows the production of parts with a high hardness, which improves the service life and wear resistance of tooling or mould insert produced from this material. The material typically consists of a martensitic matrix material, with retained austenite and nano-precipitation. The transformation from austenite to martensite has been linked to compressive stresses at the surface of parts produced in 300-grade maraging steel. In a cantilever beam-type part, this means that after cutting from the base-plate, the part will bend downwards, which is the opposite direction from the deformation found in most other materials after additive manufacturing. One way to gain insight into processing 300-grade maraging steel, while limiting the number of test samples that need to be printed, is by means of a numerical model. Using previously established models, additive manufacturing of a cantilever part in 300-grade maraging steel is simulated. Inclusion of the transformation from austenite to martensite into a numerical simulation of the laser-based powder bed fusion revealed the origin of the compressive stress at the surface of a simple cantilever beam-type sample. Additionally, changing the effective laser power through the laser absorptivity shows that the behaviour of the post-cutting deformation flips as compared to more conventional materials. Information about the laser absorption coefficient is rare, while it can greatly affect the results of a simulation. It is included in the presented result through the effective laser power, which is the product of the input laser power and laser absorption coefficient. When the effective laser power is changed from 95 W to 47.5 W, the cantilever bends upwards rather than downwards after release from the base plate. The results demonstrate the major influence played by the laser absorption coefficient on the simulation, an aspect to which little attention is paid in literature, but is proven to be one of the main factors to determine the component distortions after the laser-based powder bed fusion process.
引用
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页数:11
相关论文
共 69 条
[51]   Modeling of Microstructure Evolution of Ti6Al4V for Additive Manufacturing [J].
Salsi, Emilio ;
Chiumenti, Michele ;
Cervera, Miguel .
METALS, 2018, 8 (08)
[52]   Empirical methodology to determine inherent strains in additive manufacturing [J].
Setien, Inaki ;
Chiumenti, Michele ;
van der Veen, Sjoerd ;
San Sebastian, Maria ;
Garciandia, Fermin ;
Echeverria, Alberto .
COMPUTERS & MATHEMATICS WITH APPLICATIONS, 2019, 78 (07) :2282-2295
[53]   Modelling of additive manufacturing processes: a review and classification [J].
Stavropoulos, Panagiotis ;
Foteinopoulos, Panagis .
MANUFACTURING REVIEW, 2018, 5
[54]   Microstructural characterization and properties of selective laser melted maraging steel with different build directions [J].
Tan, Chaolin ;
Zhou, Kesong ;
Kuang, Min ;
Ma, Wenyou ;
Kuang, Tongchun .
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS, 2018, 19 (01) :746-758
[55]   Microstructural evolution, nanoprecipitation behavior and mechanical properties of selective laser melted high-performance grade 300 maraging steel [J].
Tan, Chaolin ;
Zhou, Kesong ;
Ma, Wenyou ;
Zhang, Panpan ;
Liu, Min ;
Kuang, Tongchun .
MATERIALS & DESIGN, 2017, 134 :23-34
[56]   Solutions for modelling moving heat sources in a semi-infinite medium and applications to laser material processing [J].
Van Elsen, M. ;
Baelmans, M. ;
Mercelis, P. ;
Kruth, J. -P. .
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2007, 50 (23-24) :4872-4882
[57]   PRECIPITATION HARDENING IN 350-GRADE MARAGING-STEEL [J].
VISWANATHAN, UK ;
DEY, GK ;
ASUNDI, MK .
METALLURGICAL TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, 1993, 24 (11) :2429-2442
[58]  
Vrancken B.V., 2013, P SOLID FREEFORM FAB, P393, DOI DOI 10.26153/TSW/15559
[59]   Fast simulation of temperature and phase transitions in directed energy deposition additive manufacturing [J].
Weisz-Patrault, Daniel .
ADDITIVE MANUFACTURING, 2020, 31
[60]   A pragmatic part scale model for residual stress and distortion prediction in powder bed fusion [J].
Williams, Richard J. ;
Davies, Catrin M. ;
Hooper, Paul A. .
ADDITIVE MANUFACTURING, 2018, 22 :416-425