Selective laser melting of the hard-to-weld IN738LC superalloy: Efforts to mitigate defects and the resultant microstructural and mechanical properties

Wang, H.1; Zhang, X.1,2; Wang, G. B.1; Shen, J.1; Zhang, G. Q.1; Li, Y. P.3; Yan, M.2

2019-10-30

10.1016/j.jallcom.2019.151662

JOURNAL OF ALLOYS AND COMPOUNDS   Impact Factor & Quartile

0925-8388

1873-4669

IN738LC is an important high performance Ni-based superalloy. Its additive manufacturing via selective laser melting (SLM), however, is rather challenging due to the cracking-prone nature of the alloy whose chemical composition contains high amount of alloying elements namely Ti and Al. We address this significant problem by this study through systematic investigations on the pre-processing, SLM optimization, and post-processing of the material, as well as using advanced analytical tools such as micro-CT. A comprehensive process map for achieving crack-free, high-density samples (similar to 99.76%) is provided. Mechanisms influencing densification, cracking and mechanical properties are discussed. Excellent mechanical properties have been achieved at both room temperature (895/1010 MPa as the yield and tensile strengths) and elevated temperature of 850 degrees C (720 MPa tensile strength and 14.4% elongation). A demonstrative as-printed turbine blade is also presented, highlighting the capability of SLM to simultaneously achieve excellent mechanical property and good geometric integrity. (C) 2019 Elsevier B.V. All rights reserved.

Selective laser melting Ni-based superalloy IN738LC Process map Post processing

SCI ; EI

English

Corresponding

National Science Foundation of Guangdong Province[2016A030313756]

Chemistry ; Materials Science ; Metallurgy & Metallurgical Engineering

Chemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000483692200029

ELSEVIER SCIENCE SA

20193307304133

Advanced Analytics ; Alloying elements ; Computerized tomography ; Cracking (chemical) ; Cracks ; Mechanisms ; Melting ; Nickel alloys ; Superalloys ; Tensile strength ; Turbomachine blades

Metallurgy and Metallography:531 ; Metallurgy:531.1 ; Nickel Alloys:548.2 ; Mechanisms:601.3 ; Computer Applications:723.5 ; Chemical Reactions:802.2 ; Chemical Operations:802.3

MATERIALS SCIENCE

Web of Science

1.Shenzhen Univ, Coll Mechatron & Control Engn, Guangdong Prov Key Lab Micro Nano Optomechatron E, Shenzhen 518060, Peoples R China
2.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen Key Lab Addit Mfg High Performance Mat, Shenzhen 518055, Peoples R China
3.Cent S Univ, State Key Lab Powder Met, Changsha 410083, Hunan, Peoples R China

Wang, H.,Zhang, X.,Wang, G. B.,et al. Selective laser melting of the hard-to-weld IN738LC superalloy: Efforts to mitigate defects and the resultant microstructural and mechanical properties[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2019,807.

Wang, H..,Zhang, X..,Wang, G. B..,Shen, J..,Zhang, G. Q..,...&Yan, M..(2019).Selective laser melting of the hard-to-weld IN738LC superalloy: Efforts to mitigate defects and the resultant microstructural and mechanical properties.JOURNAL OF ALLOYS AND COMPOUNDS,807.

Wang, H.,et al."Selective laser melting of the hard-to-weld IN738LC superalloy: Efforts to mitigate defects and the resultant microstructural and mechanical properties".JOURNAL OF ALLOYS AND COMPOUNDS 807(2019).