Journal
ENGINEERING FAILURE ANALYSIS
Volume 18, Issue 1, Pages 485-491Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.engfailanal.2010.09.043
Keywords
Dissimilar weldments T91/STN15128 and T91/TP316H; Hydrogen embrittlement (HE); Notch tensile properties; Fracture mode
Funding
- Slovak Scientific Grant Agency - VEGA [2/0128/10]
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The influence of hydrogen charging on the room-temperature tensile properties and fracture behaviour of two dissimilar weld joints has been investigated The weld joints were either ferritic/ferritic (T91/STN15128) or ferritic/austenitic (T91/TP316H) The tensile tests were carried out using the samples with a circumferential notch The position of notch was individually located in different weld joint regions either in the heat-affected zones (HAZ) or weld metal (WM) The application of hydrogen charging had detrimental effect on strength and plasticity of the weld joint T91/STN15128 The most significant deterioration of the notch tensile properties was measured for the STN15128 HAZ The hydrogen charging had only small influence on the strength of the weld joint T91/TP316H but remarkable detrimental effects on the plasticity In the PWHT state (without hydrogen charging) all regions of the studied weld Joints fractured by ductile dimple tearing The failure initiated on the secondary phase particles and/or inclusions as well In contrast the failure after hydrogen charging initiated in the vicinity of sizeable particles and showed a transition from the ductile dimple tearing to the transgranular cleavage and/or quasi-cleavage fracture mode (C) 2010 Elsevier Ltd All rights reserved
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