Effect of heat treatment on tribological behavior of direct metal laser sintered alloy 718
S.M. Muthu,
Dhinakaran Veeman,
Vijayakumar Asokan,
M. Sathishkumar,
L. Vadivel Kannan,
M. Vignesh,
L. Rajeshkumar
Affiliations
S.M. Muthu
Centre for Additive Manufacturing, Chennai Institute of Technology, Chennai 600069, India; Department of Nuclear and Quantum Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
Dhinakaran Veeman
Centre for Additive Manufacturing, Chennai Institute of Technology, Chennai 600069, India
Vijayakumar Asokan
Centre for Additive Manufacturing, Chennai Institute of Technology, Chennai 600069, India
M. Sathishkumar
Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Chennai, India; Corresponding author
L. Vadivel Kannan
Department of Mechanical Engineering, PSNA College of Engineering and Technology, Dindigul 624622, India
M. Vignesh
Department of Mechanical Engineering, Amrita School of Engineering, Amrita Vishwa Vidyapeetham, Chennai, India
L. Rajeshkumar
AU-Sophisticated Testing and Instrumentation Centre (STIC) and Department of Mechanical Engineering, Alliance School of Applied Engineering, Alliance University, Bengaluru 562106, India; Corresponding author
Summary: The main aim of this work is to enhance the wear performance of the direct metal laser sintered (DMLS) alloy 718 by solution treatment aging (STA) method at room temperature (RT) (28°C) and 400°C in dry sliding conditions. The effect of microstructure, phase analysis, and microhardness on the wear behavior and the influence of STA on the specimen at elevated temperatures were studied. The microstructure revealed the presence of melt pool boundary (MPB) in untreated DMLS alloy while recrystallized grains were observed in the STA-treated alloy. The wear results elucidated that STA-treated alloy exhibited better wear resistance than as-built alloy due to high hardness at both conditions. Severe wear loss occurred at high temperatures caused by the delamination of the brittle oxide glazing layer, while oxidation and adhesive wear were the predominant wear mechanisms. Results also portrayed that the test temperature and STA treatment equally influenced the wear behavior of alloy 718.
