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Transition Reference Temperature for 20MnMoNi55 RPV Steel at Different Loading Rates

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Advances in Materials, Mechanical and Industrial Engineering (INCOM 2018)

Part of the book series: Lecture Notes on Multidisciplinary Industrial Engineering ((LNMUINEN))

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Abstract

Fracture toughness is the main designing criterion of nuclear power plant. Due to neutron embrittlement, fracture toughness of reactor pressure vessel steel becomes low. This type of phenomenon can also be observed in cryogenic temperature. But in between a certain subzero temperature range, values of fracture toughness of ferritic steel are scatter in nature. This scatter is modelled by a methodology named master curve. Master curve can be governed by a single parameter which is called reference temperature (T0). T0 is defined as a measurement of embrittlement. Crack length, thickness and loading rate have influence on fracture toughness of RPV steel. The influence of loading rate over T0 has been studied on different materials in several researches. Kim Wallin established an empirical relation between loading rate and reference temperature with the help of huge data set of different RPV steels. Sreenivasan has also proposed an empirical relation to compute quasi-static T0 from dynamic T0. In the present study, 1T-CT fracture experiments are conducted at subzero temperature (−100 °C) with varying loading rates ranging from 0.625 MPa√m/s to 417.3 MPa√m/s for 20MnMoNi55 reactor pressure vessel (RPV) steel. Master curve methodology (ASTM E1921-09a) is then used for determination of T0 for each loading rates. T0 is also estimated from Wallin’s empirical relationship and compared with experimental results for this particular material. Quasi-static T0 has also been estimated from T0 at different higher loading rates using empirical relationship proposed by Sreenivasan.

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Abbreviations

\(a\) :

Length of crack (mm)

\(a0\) :

Initial notch length (mm)

\(b0\) :

Length of uncracked ligament (mm)

\(B0\) :

Thickness of specimen (mm)

\(E\) :

Young’s modulus (GPa)

\(K\) :

Stress intensity factor (MPa√m)

\(K_{JC}\) :

Plain strain fracture toughness (MPa√m)

\(T\) :

Test temperature (°C)

\(Pf\) :

Probability of failure

\(W\) :

Width of specimen (mm)

YS:

Yield strength (MPa)

UTS:

Ultimate tensile strength (MPa)

Ν :

Poisson’s ratio

σ ys :

Yield stress (MPa)

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Authors and Affiliations

  1. Department of Mechanical Engineering, Jadavpur University, Kolkata, India

    Swagatam Paul, Sanjib Kumar Acharyya & Prasanta Sahoo

  2. Reactor Safety Division, Bhaba Atomic Research Centre, Mumbai, India

    Jayanta Chattopadhyay

Authors
  1. Swagatam Paul
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  2. Sanjib Kumar Acharyya
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  3. Prasanta Sahoo
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  4. Jayanta Chattopadhyay
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Correspondence to Swagatam Paul .

Editor information

Editors and Affiliations

  1. Department of Mechanical Engineering, Jadavpur University, Kolkata, West Bengal, India

    Prasanta Sahoo

  2. Department of Mechanical Engineering, University of Aveiro , Aveiro, Portugal

    J. Paulo Davim

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Paul, S., Acharyya, S.K., Sahoo, P., Chattopadhyay, J. (2019). Transition Reference Temperature for 20MnMoNi55 RPV Steel at Different Loading Rates. In: Sahoo, P., Davim, J. (eds) Advances in Materials, Mechanical and Industrial Engineering. INCOM 2018. Lecture Notes on Multidisciplinary Industrial Engineering. Springer, Cham. https://doi.org/10.1007/978-3-319-96968-8_6

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  • DOI: https://doi.org/10.1007/978-3-319-96968-8_6

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  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-96967-1

  • Online ISBN: 978-3-319-96968-8

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