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\begin{document}

\title{Effect of stress amplitude on damage and fracture characteristics of
austenitic heat-resistant steel Sanicro25 alloy at 973 K}



\author[1]{Jie Zhao}%
\author[1]{Dechao Lyu}%
\author[1]{Tieshan Cao}%
\author[1]{Congqian Cheng}%
\author[1]{Tongtong Zhou}%
\affil[1]{Dalian University of Technology}%


\vspace{-1em}



  
  \date{May 25, 2024}


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\selectlanguage{english}
\begin{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 ( \selectlanguage{greek}σ \selectlanguage{english}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 ( \selectlanguage{greek}σ \selectlanguage{english}a =130MPa ).%
\end{abstract}%



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\verb`Table 1.docx`  available at \url{https://authorea.com/users/526711/articles/605194-effect-of-stress-amplitude-on-damage-and-fracture-characteristics-of-austenitic-heat-resistant-steel-sanicro25-alloy-at-973-k}

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