Secondary precipitation within the cementite phase of reactor pressure vessel steels

SCRIPTA MATERIALIA

卷:115

Article

Zelenty, J.¹  Smith, G. D. W.¹  Wilford, K.²  Hyde, J. M.³  Moody, M. P.¹ 

[1] Univ Oxford, Dept Mat, Parks Rd, Oxford OX1 3PH, England

[2] Rolls Royce, POB 2000, Derby DE21 7XX, England

[3] Culham Sci Ctr, Natl Nucl Lab, Abingdon OX14 3DB, Oxon, England

关键词: RPV steels;    Cementite;    Precipitation;    Atom probe tomography;    Thermal ageing;   

DOI  :  10.1016/j.scriptamat.2015.12.039

来源: Elsevier

【 摘 要 】

Solute clustering is known to play a significant role in the embrittlement of reactor pressure vessel (RPV) steels. In this study, previously unobserved manganese-, nickel-, and silicon-rich precipitates in the cementite phase of a thermally aged, low copper RPV steel are characterised at the atomic scale via atom probe tomography. Additionally, copper-rich precipitates are observed in the cementite phase of a thermally aged, high copper RPV steel. Due to their secluded nature, these secondary precipitates could be utilised as indicators of the time-temperature exposure of RPVs and assist in assessing remnant lifetime. (C) 2016 Elsevier Ltd. All rights reserved.

【 授权许可】

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