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http://dx.doi.org/10.3795/KSME-A.2017.41.8.751

Evaluation of Fatigue Crack Propagation Behavior of Nickel-based Powder Metallurgy Superalloy for Aircraft at Elevated Temperature  

Yoon, Dong Hyun (Dept. of Mechanical Engineering, Chungnam Nat'l Univ.)
Na, Seong Hyeon (Dept. of Mechanical Engineering, Chungnam Nat'l Univ.)
Kim, Jae Hoon (Dept. of Mechanical Engineering, Chungnam Nat'l Univ.)
Kim, Hongkyu (The 4th R&D Institute - 4th Directorate, Agency for Defense Development)
Kim, Donghoon (The 4th R&D Institute - 4th Directorate, Agency for Defense Development)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.41, no.8, 2017 , pp. 751-758 More about this Journal
Abstract
The behavior of fatigue crack growth of nickel-based powder metallurgy superalloy that could be used in aircraft turbine disc is investigated at room temperature, and $650^{\circ}C$ considering real operating conditions. The direct current potential drop(DCPD) method was used to measure the crack length of material in real time according to ASTM E647. Tests were performed with various stress ratios (0.1 and 0.5). Experimental results show that stress ratio, and temperature all affect the behavior of fatigue crack growth. As the stress ratio and temperature increase, the fatigue crack growth rate of nickel-based powder metallurgy superalloy also increases. Results were compared and reviewed with fatigue crack growth rates of other nickel-based superalloy materials (Inconel-100) that were studied in previous papers. Fractography analysis of the fractured specimens was performed using as SEM.
Keywords
Direct Current Potential Drop; Fatigue Crack Propagation; Nickel Based Superalloy; Powder Metallurgy;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
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