Mechanically Blended Al: Simple but Effective Approach to Improving Mechanical Property and Thermal Stability of Selective Laser-Melted Inconel 718

Zhang, Z. H.1,2,3; Zhou, Y. H.1,2,3; Zhou, S. Y.1,2; Zhang, L.4; Yan, M.1,2

2019-08

10.1007/s11661-019-05299-6

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE   影响因子和分区

1073-5623

1543-1940

Inconel718 (IN718) superalloy is one of the most widely employed high-temperature materials. How to improve its working temperature limit is a challenging but rewarding task. In this study, we have proved that by simply mechanical blending pre-alloyed IN718 powder with elemental Al powder, one can successfully add extra Al to the IN718 alloy. The Al-added IN718 alloys developed by this study show homogenous distribution of Al in the as-printed microstructure produced by selective laser melting (SLM), and only a slight loss of the Al amount is detected due to SLM in situ alloying. Excellent relative density of > 99.5 pct has been achieved, and after the standard heat treatment, the IN718 + 0.5Al alloy shows good mechanical properties, achieving a fracture strength of similar to 1400 MPa and elongation of similar to 12 pct. Introducing an extra amount of Al into the IN718 alloy has also improved thermal stability, in which testing is conducted at 680 degrees C and held for 100hours. Meanwhile, it is noted that by a new heat treatment approach, the Al-doped IN718 alloy achieves the best fracture strength at similar to 1600 MPa and elongation at similar to 10 pct. The implications of the study have been addressed.

SCI ; EI

英语

第一 ; 通讯

National Science Foundation of Guangdong Province[2016A030313756]

Materials Science ; Metallurgy & Metallurgical Engineering

Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering

WOS:000473514600046

SPRINGER

20192407043854

Aluminum alloys ; Blending ; Density (specific gravity) ; Fracture toughness ; Heat treatment ; High temperature effects ; Mechanical properties ; Selective laser melting ; Temperature ; Thermodynamic stability

Heat Treatment Processes:537.1 ; Aluminum Alloys:541.2 ; Thermodynamics:641.1 ; Chemical Operations:802.3 ; Physical Properties of Gases, Liquids and Solids:931.2

MATERIALS SCIENCE

Web of Science

1.Southern Univ Sci & Technol, Dept Mat Sci & Engn, Shenzhen 518055, Peoples R China
2.Southern Univ Sci & Technol, Shenzhen Key Lab Addit Mfg High Performance Mat, Shenzhen 518055, Peoples R China
3.Harbin Inst Technol, Harbin 150001, Heilongjiang, Peoples R China
4.Shenzhen Polytech, Shenzhen 518055, Peoples R China

Zhang, Z. H.,Zhou, Y. H.,Zhou, S. Y.,et al. Mechanically Blended Al: Simple but Effective Approach to Improving Mechanical Property and Thermal Stability of Selective Laser-Melted Inconel 718[J]. METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,2019,50A(8):3922-3936.

Zhang, Z. H.,Zhou, Y. H.,Zhou, S. Y.,Zhang, L.,&Yan, M..(2019).Mechanically Blended Al: Simple but Effective Approach to Improving Mechanical Property and Thermal Stability of Selective Laser-Melted Inconel 718.METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE,50A(8),3922-3936.

Zhang, Z. H.,et al."Mechanically Blended Al: Simple but Effective Approach to Improving Mechanical Property and Thermal Stability of Selective Laser-Melted Inconel 718".METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE 50A.8(2019):3922-3936.