Transitions in the thermal stability of pre-strained austenite – competing effects between defect density and slip band spacing

The transition from mechanical destabilization to stabilization in metastable austenite is an important issue affecting the design of structures used at lower temperatures. We have conducted in-situ magnetic measurement and detailed microscopy work to reveal the underlying mechanisms of such transit...

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Bibliographic Details
Published inScripta materialia Vol. 223; p. 115077
Main Authors Dong, Guangqi, Wang, Jinliang, Wang, Lingyu, Wang, Chenchong, Hu, Jun, Xu, Wei
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.01.2023
Subjects
Martensitic transformation
Mechanical destabilization
Mechanical stabilization
Metastable austenite
Thermal stability
Metastable austenite
Mechanical destabilization
Martensitic transformation
Mechanical stabilization
Thermal stability
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Summary:The transition from mechanical destabilization to stabilization in metastable austenite is an important issue affecting the design of structures used at lower temperatures. We have conducted in-situ magnetic measurement and detailed microscopy work to reveal the underlying mechanisms of such transition. Austenite destabilization is attributed to the increase of slip band and dislocation densities which provide extra nucleation sites. The decreased slip band spacing divides the austenite grains into small units, hindering the growth of martensite. It also inhibits the formation of multiple martensite variants and retards nucleation. The competition between defect density and spacing is the key to the transition. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2022.115077