In-situ investigations of hydrogen influenced crack initiation and propagation under tensile and low cycle fatigue loadings in RPV steel

被引:22
|
作者
Singh, Rajwinder [1 ]
Singh, Vishal [1 ]
Arora, Aman [1 ]
Mahajan, Dhiraj K. [1 ]
机构
[1] Indian Inst Technol Ropar, Dept Mech Engn, Ropar Mech Mat Lab, Rupnagar 140001, Punjab, India
关键词
SA508 grade 3 class I low alloy steel; Tensile loading; Low cycle fatigue loading; Hydrogen charging; Crack initiation; Crack propagation; PRESSURE-VESSEL STEELS; LOW-ALLOY STEEL; FRACTURE-BEHAVIOR; STRAIN-RATE; MECHANICAL-PROPERTIES; GROWTH-BEHAVIOR; EMBRITTLEMENT; DEFORMATION; TEMPERATURE; PLASTICITY;
D O I
10.1016/j.jnucmat.2019.151912
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Present work aims to unveil the mechanism of hydrogen embrittlement (HE) in SA508 Grade 3 Class I low alloy reactor pressure vessel (RPV) steel. In-situ tensile and low cycle fatigue (LCF) tests are performed on specially designed specimens using tensile/fatigue testing stage under scanning electron microscope (SEM). Electrochemical hydrogen charging resulted in localized void formation at prior austenite grain boundaries (PAGBs) during tensile loading. Alongside the hydrogen induced weakening of PAGBs due to synergetic HELP (hydrogen enhanced localized plasticity) and HEDE (hydrogen enhanced decohesion) mechanisms of HE, fish-eyes formation around Al2O3-SiO2 type inclusions are the primary factors for hydrogen enhanced tensile properties degradation in subject RPV steel. During LCF loading, crack initiation and propagation is facilitated by long rod inter-lath cementite particles distributed along the bainitic ferrite lath boundaries in the un-charged specimen. In case of hydrogen charged specimen, the edge crack formed during LCF loading propagated through the specimen by cleavage. Predominantly plasticity (slip) driven transgranular crack propagation occurred in un-charged specimen. In contrary, hydrogen charging resulted in LCF crack to propagate in mixed intergranular and transgranular manner during early stages of propagation, whereas once the crack length exceeded 5 to 6 grains, cleavage type transgranular crack propagation was observed. (C) 2019 Elsevier B.V. All rights reserved.
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页数:13
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