Investigation of creep behavior of Ni3Al-base superalloy by small punch creep. (May 2021)

• Record Type: Journal Article
• Authors: Cao, Yan; Mohamed, Abdeliazim Mustafa; Moshtaghi, Samira; Taheri, Morteza; Torkamany, Mohammad Javad
• Is Part Of: Vacuum. Volume 187(2021)
• Publication Date: 2021-05
• Subjects: Ni3Al-Base superalloy -- SPCT -- HAZ -- Creep -- Liquation cracking; Vacuum -- Periodicals; 621.55
• DOI: 10.1016/j.vacuum.2021.110101
• Languages: English
• ISSNs: 0042-207X

Abstract

Abstract: This study aimed to investigate the creep behavior of Ni3 Al-base superalloy through small punch creep test. For this purpose, Rene 80 specimens in both casting and heat treatment conditions, after welding by Nd:YAD pulsed-laser, were subjected to a small punch creep test at 700 °C temperature and forces 350 N, 450 N. The results showed that the lowest and highest creep life in the cast specimen is related to heat-affected zone and weld metal, respectively. Coarsening, liquation, and grain boundary cracking in heat-affected zone were the most important factors in reducing creep life. Cr-Mo and Ni-Zr phases were the most important factors that were eliminated in heat-treatment specimen due to dissolution of these factors. Highlights: The most important advantage of SPCT is the creep evaluation of different areas of welded specimens The presence of γ-γ′ eutectic, Ni-Zr intermetallic and Cr-Mo boride as the cause of liquation cracks in HAZ. The presence of melt-sensitive phases reduces the creep resistance of cast samples by about 40% compared to heat treated samples.