Stress-induced martensitic transformation in metastable austenite grains during nanoindentation investigation

He，B. B.1,2; Shang，X. K.2

2021

10.1080/09500839.2021.1936258

PHILOSOPHICAL MAGAZINE LETTERS   影响因子和分区

0950-0839

1362-3036

In general, the formation of martensite in the metastable austenite grains in steels during nanoindentation investigations is believed to be induced by strain as the plastic deformation of austenite takes place prior to the martensitic transformation. However, it is not clear whether the formation of martensite occurs without the prior initiation of plasticity (stress-induced martensitic transformation) during nanoindentation measurement. The present work demonstrates that the martensitic transformation can be triggered during elastic deformation of austenite under an ultralow load when the indenter is close to the annealing twin boundaries. The indentation pressure interacts with the martensite transformation strain, providing the mechanical interaction energy to overcome the nucleation barrier of the martensite embryo. The present work suggests that the annealing twin boundaries can also serve as the nucleation sites of martensite and the stress-induced martensitic transformation is possible during nanoindentation investigation.

austenite elastic deformation Martensitic transformation mechanical stability nanoindentation

SCI ; EI

英语

第一 ; 通讯

WOS:000658578600001

20212410489929

Austenite ; Crystallization ; Martensite ; Nanoindentation ; Nucleation

Metallography:531.2 ; Nanotechnology:761 ; Chemical Operations:802.3 ; Crystal Growth:933.1.2

PHYSICS

2-s2.0-85107509527

Scopus

1.Shenzhen Key Laboratory of Cross-Scale Manufacturing Mechanics,Southern University of Science and Technology,Shenzhen,China
2.Department of Mechanical and Energy Engineering,Southern University of Science and Technology,Shenzhen,China

He，B. B.,Shang，X. K.. Stress-induced martensitic transformation in metastable austenite grains during nanoindentation investigation[J]. PHILOSOPHICAL MAGAZINE LETTERS,2021,101:417-431.

He，B. B.,&Shang，X. K..(2021).Stress-induced martensitic transformation in metastable austenite grains during nanoindentation investigation.PHILOSOPHICAL MAGAZINE LETTERS,101,417-431.

He，B. B.,et al."Stress-induced martensitic transformation in metastable austenite grains during nanoindentation investigation".PHILOSOPHICAL MAGAZINE LETTERS 101(2021):417-431.