Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 831, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2021.142041
Keywords
Nickel-base 718 alloy; Additive manufacturing; Laser directed energy deposition; Compressive residual stress; Fatigue performance; Ultrasonic nanocrystal surface modification
Categories
Funding
- Industrial Technology Innovation Development Project of the Ministry of Commerce, Industry and Energy, Rep. Korea [20010482]
- Korea Hydro & Nuclear Power Co., Ltd. [2018-TECH-12]
- National Research Foundation of Korea [2020K2A9A1A06103270]
- Korea Evaluation Institute of Industrial Technology (KEIT) [20010482] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2020K2A9A1A06103270] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
Ask authors/readers for more resources
The beneficial effect of ultrasonic nanocrystal surface modification (UNSM) treatment on the mechanical properties and fatigue performance of Nickel-base 718 alloy fabricated by laser directed energy deposition (LDED) process was investigated in this study. The treatment demonstrated a significant enhancement in fatigue performance by introducing high compressive residual stress (CRS) and generating a nanostructured surface layer. Additionally, it was found that surface roughness decreased and hardness increased after the treatment.
In this study, the beneficial effect of ultrasonic nanocrystal surface modification (UNSM) treatment at room and high temperatures (RT and HT) on the mechanical properties and fatigue performance of Nickel-base 718 alloy that is fabricated by laser directed energy deposition (LDED) process was investigated. UNSM treatment at RT and HT demonstrated a significant enhancement in fatigue performance by approximately of 43% and 57%, respectively. This can be attributed to the introduction of a high compressive residual stress (CRS) and the generation of nanostructured surface layer. Moreover, it was found that the surface roughness reduced, while the hardness increased after UNSM treatment at RT and HT. Furthermore, it was found by analysing the fatigued surfaces that the main crack initiation site was located at the subsurface for the UNSM-treated samples, while it was located at the top surface for the untreated ones. Introduction of a high CRS by UNSM treatment at RT and HT shifted a crack initiation site into subsurface.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available
Share Paper
