• Title/Summary/Keyword: 니켈기 초내열합금

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Low-Cycle Fatigue in Ni-Base Superalloy IN738LC at Elevated Temperature (니켈기 초내열합금 IN738LC의 고온 저주기피로 거동)

  • Hwang, Kwon-Tae;Kim, Jae-Hoon;Yoo, Keun-Bong;Lee, Han-Sang;Yoo, Young-Soo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.10
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    • pp.1403-1409
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    • 2010

  • For many years, high-strength nickel-base superalloys have been used to manufacture turbine blades because of their excellent performance at high temperatures. The prediction of fatigue life of superalloys is important for improving the efficiency of the turbine blades. In this study, low cycle fatigue tests are performed for different values of total strain and temperature. The relations between strain energy density and number of cycles before failure occurs are examined in order to predict the low cycle fatigue life of IN738LC super alloy. The results of low cycle fatigue lives predicted by strain energy methods are found to coincide with experimental data and with the results obtained by the Coffin-Manson method.

  • https://doi.org/10.3795/KSME-A.2010.34.10.1403 인용 PDF KSCI

Evaluation of Fatigue Crack Propagation Behavior of Nickel-based Powder Metallurgy Superalloy for Aircraft at Elevated Temperature (항공기 터빈 디스크용 니켈기 초내열 분말야금 합금의 고온 피로균열진전 거동 비교 평가)

  • Yoon, Dong Hyun;Na, Seong Hyeon;Kim, Jae Hoon;Kim, Hongkyu;Kim, Donghoon
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.41 no.8
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    • pp.751-758
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    • 2017

  • 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.

  • https://doi.org/10.3795/KSME-A.2017.41.8.751 인용 PDF KSCI

High Temperature Mechanical Properties of 713LC Ni-based Superalloy (니켈기 초내열 713LC 합금의 고온 기계적 특성)

  • Na, Yeong-Sang;Kim, Jong-Yeop;Lee, Jong-Hun;Park, No-Gwang
    • 연구논문집
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    • s.33
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    • pp.167-174
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    • 2003

  • Alloy 713LC was developed to improve the tensile strength and ductility by reducing the carbon content of Alloy 713C. As Alloy 713LC was designed to minimize the mechanical property change with process conditions, it is generally utilized in the parts which have thick and thin sections simultaneously. In the thick and the thin sections, quite different properties are required. Consequently it is essential to crucially control the local mechanical properties of a parts by optimizing the process condition and heat treatment. In this research, high temperature mechanical properties including creep-rupture and strain-control low cycle fatigue were investigated together with the microstructural variations with heat treatment. Failure mechanism was also analyzed by observing the fracture surface to correlate the variation of mechanical properties with the microstructural change.

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