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Effect of stress amplitude on damage and fracture characteristics of austenitic heat-resistant steel Sanicro25 alloy at 973 K
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  • Jie Zhao,
  • Dechao Lyu,
  • Tieshan Cao,
  • Congqian Cheng,
  • Tongtong Zhou
Jie Zhao
Dalian University of Technology

Corresponding Author:[email protected]

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Dechao Lyu
Dalian University of Technology
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Tieshan Cao
Dalian University of Technology
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Congqian Cheng
Dalian University of Technology
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Tongtong Zhou
Dalian University of Technology
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Abstract

High-temperature damage characteristics related to the deformation behavior of Sanicro25 alloy were investigated under cyclic loading. The results show that the high mean stress can lead to creep-like deformation behavior. The increase of mean stress increased the strain rate and weakened the life. Comparatively, the increase in stress amplitude only accelerated the third-regime strain rate, leading to a decrease in life and fracture strain. Under different stress amplitudes, microcrack initiation at Z phase interfaces can be certified by observing micropore and high geometrically necessary dislocation (GND) density around Z phase. Subsequently, the increase in stress amplitude can significantly affect crack propagation. Under constant loading ( σ a =0MPa ), the recrystallization of the transgranular crack tip at the grain boundary can change the tendency of crack propagation, making crack propagation along the grain boundaries. Conversely, transgranular cracks can continue to propagate, assisted by intragranular dislocation accumulation at higher stress amplitude ( σ a =130MPa ).
25 Nov 2022Submitted to Fatigue & Fracture of Engineering Materials & Structures
25 Nov 2022Submission Checks Completed
25 Nov 2022Assigned to Editor
28 Nov 2022Reviewer(s) Assigned
22 Mar 2023Review(s) Completed, Editorial Evaluation Pending
23 Mar 2023Editorial Decision: Revise Major
25 Apr 20231st Revision Received
25 Apr 2023Submission Checks Completed
25 Apr 2023Assigned to Editor
02 May 2023Reviewer(s) Assigned
26 May 2023Review(s) Completed, Editorial Evaluation Pending
02 Jun 2023Editorial Decision: Revise Minor
06 Jun 20232nd Revision Received
06 Jun 2023Submission Checks Completed
06 Jun 2023Assigned to Editor
08 Jun 2023Reviewer(s) Assigned
08 Jun 2023Review(s) Completed, Editorial Evaluation Pending
11 Jun 2023Editorial Decision: Accept