Selective laser melting of Ti–22Al–25Nb intermetallic: Significant effects of hatch distance on microstructural features and mechanical properties

Zhou，Y. H.1,2; Li，W. P.2,3; Zhang，L.4; Zhou，S. Y.2; Jia，X.2; Wang，D. W.2; Yan，M.2

2020-02-01

10.1016/j.jmatprotec.2019.116398

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY   影响因子和分区

0924-0136

Ti–22Al–25Nb (at.%) intermetallic is a light weight, high performance, high temperature material with density of merely ˜60% of Ni-based superalloys. The advent and rapid development of selective laser melting (SLM) enable direct fabrication of the Ti–22Al–25Nb intermetallic into complex geometry parts, promising for various critical applications. This paper is dedicated to better understanding the effects of hatch distance, an important but often underestimated processing factor, on microstructure and mechanical properties of the SLM-prepared Ti–22Al–25Nb. Along with analytical means such as transmission electron microscopy (TEM) and electron backscatter diffraction (EBSD), finite element simulation has also been employed to explore the underlying mechanisms. It is determined that the highest mechanical properties are achieved at a hatch distance of 0.16 mm due to the following factors: (a) High density dislocation, (2) favorable phase features, and (3) high relative density. As-fabricated parts of micro-turbine engine using the optimized parameters are provided in the end of the study to demonstrate the capability of SLM to manufacture high quality and delicate structural parts of the Ti–22Al–25Nb intermetallic.

Hatch distance Intermetallics Mechanical property Microstructure Selective laser melting Ti–22Al–25Nb

SCI ; EI

英语

通讯

Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ20170817111811303] ; Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ20170817110358927] ; Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ20170817110331228] ; Science, Technology and Innovation Commission of Shenzhen Municipality[ZDSYS201703031748354]

Engineering ; Materials Science

Engineering, Industrial ; Engineering, Manufacturing ; Materials Science, Multidisciplinary

WOS:000497256200018

ELSEVIER SCIENCE SA

20193907471793

Density (specific gravity) ; Hatches ; High resolution transmission electron microscopy ; High temperature effects ; Intermetallics ; Light modulators ; Mechanical properties ; Mechanisms ; Melting ; Microstructure ; Nickel alloys

Metallurgy:531.1 ; Nickel Alloys:548.2 ; Mechanisms:601.3 ; Optical Devices and Systems:741.3 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2 ; Materials Science:951

MATERIALS SCIENCE

2-s2.0-85072580751

Scopus

1.School of Materials Science and EngineeringHarbin Institute of Technology,Harbin,150001,China
2.Department of Materials Science and Engineeringand Shenzhen Key Laboratory for Additive Manufacturing of High-performance MaterialsSouthern University of Science and Technology,Shenzhen,518055,China
3.College of Mechatronics and Control EngineeringShenzhen University,Shenzhen,518060,China
4.Institute of Intelligent Manufacturing TechnologyShenzhen Polytechnic,Shenzhen,Shenzhen,518055,China

Zhou，Y. H.,Li，W. P.,Zhang，L.,等. Selective laser melting of Ti–22Al–25Nb intermetallic: Significant effects of hatch distance on microstructural features and mechanical properties[J]. JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,2020,276.

Zhou，Y. H..,Li，W. P..,Zhang，L..,Zhou，S. Y..,Jia，X..,...&Yan，M..(2020).Selective laser melting of Ti–22Al–25Nb intermetallic: Significant effects of hatch distance on microstructural features and mechanical properties.JOURNAL OF MATERIALS PROCESSING TECHNOLOGY,276.

Zhou，Y. H.,et al."Selective laser melting of Ti–22Al–25Nb intermetallic: Significant effects of hatch distance on microstructural features and mechanical properties".JOURNAL OF MATERIALS PROCESSING TECHNOLOGY 276(2020).