TY - JOUR ID - 106036 TI - Effects of Ageing and Forging on Short-term Creep Behaviors of Inconel-713C Superalloy at 850 °C JO - International Journal of Engineering JA - IJE LA - en SN - 1025-2495 AU - Azadi, M. AU - Azadi, M. AU - Hajiali Mohammadi, A. AD - Faculty of Materials and Metallurgical Engineering, Semnan University, Semnan, Iran AD - Faculty of Mechanical Engineering, Semnan University, Semnan, Iran Y1 - 2020 PY - 2020 VL - 33 IS - 4 SP - 639 EP - 646 KW - Inconel-713C Superalloy KW - Short-term Creep KW - Age-hardening KW - forging KW - Microstructure DO - 10.5829/ije.2020.33.04a.15 N2 - In this paper, the short-term creep behavior of the Inconel-713C superalloy after different pre-treatments including the ageing and forging processes has been studied at 850 °C. The ageing heat treatment was heating at 930 °C for 16 hours without solutioning process. The optical microscopy (OM) and the scanning electron microscopy (SEM) techniques were applied for microstructural evaluations. The results showed that although the ageing treatment increased the γ’ phase content, the age-hardened material had a lower creep lifetime (about 40%) with respect to the as-cast alloy. This was related to the decrease in the amount of M23C6-type secondary carbides precipitation. When the Inconel-713C superalloy specimen was forged at 1200 °C, the third stage of the creep curve (strain versus time) increased drastically and shortened the creep lifetime. The small grain size of the forged specimen was responsible for such inverse creep behavior. In addition, fractographs of this specimen indicated intragranular cracks on the ruptured surface. When the forged sample was age-hardened directly without the solutioning treatment, the creep lifetime increased about 4 times as compared to the forged specimen. UR - https://www.ije.ir/article_106036.html L1 - https://www.ije.ir/article_106036_1989aa2b0ffb7fe16ca0dd8c6f98f6e2.pdf ER -