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Characterization of the Q* parameter for evaluating creep crack growth rate for type 316LN stainless steel

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Abstract

In this study, the Q* parameter was characterized to evaluate the Creep crack growth rate (CCGR) of type 316LN stainless steel. Creep crack growth (CCG) data were obtained by CCG tests under different applied loads at 600°C. An additional CCG test was conducted at 550°C to investigate the possible temperature dependence of the stress intensity factor. An equation using the Q* parameter for evaluating CCGR was proposed, and this parameter was characterized and compared with the typical C* fracture parameter, which is commonly used. The Q* parameter exhibited good linearity of the data, exhibiting no nonlinearity-induced dual value at the early stage. The Q* parameter was suitable for characterizing the CCGR regardless of different applied loads and types of steels. In addition, fracture microstructures near the crack revealed a typical intergranular fracture mode, and this fracture was dominantly propagated along the grain boundary. The cracks were developed by the growth and interlinking of cavities, which were attributed to the precipitates forming along the grain boundary.

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Authors and Affiliations

  1. Graduate School, Department of Mechanical Design Engineering, Pukyong National University, Busan, 608-739, Korea

    I. M. W. Ekaputra, Jae-Young Park & Seon-Jin Kim

  2. Korea Atomic Energy Research Institute, 1045 Daedeok-daero, Yuseong-gu, Daejeon, 305-353, Korea

    Woo-Gon Kim & Eung-Seon Kim

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  1. I. M. W. Ekaputra
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  2. Woo-Gon Kim
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  3. Jae-Young Park
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  4. Seon-Jin Kim
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  5. Eung-Seon Kim
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Recommended by Editor Chongdu Cho

I Made Wicaksana Ekaputra is a Ph.D. candidate in the Department of Mechanical Design Engineering of Pukyong National University. He received a B.A. degree from Diponegoro University, Indonesia, in 2008 and a master’s degree in Engineering from Pukyong National University, Korea, in 2013. His main research interests include creep and creep crack growth behaviors at elevated temperatures.

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Ekaputra, I.M.W., Kim, WG., Park, JY. et al. Characterization of the Q* parameter for evaluating creep crack growth rate for type 316LN stainless steel. J Mech Sci Technol 30, 3151–3158 (2016). https://doi.org/10.1007/s12206-016-0625-4

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  • DOI: https://doi.org/10.1007/s12206-016-0625-4

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