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Interaction Between Deformation‐Induced and Thermal Martensite in High‐Manganese TRIP Steel
Author(s) -
Yang Haiyan,
Li Jing,
Yang Ping
Publication year - 2015
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201400297
Subject(s) - martensite , materials science , bainite , austenite , deformation (meteorology) , nucleation , metallurgy , plasticity , composite material , microstructure , thermodynamics , physics
The interaction between deformation‐induced and thermal martensite during tensile deformation in high‐manganese transformation induced plasticity steel was studied through in situ observation and electron backscattering diffraction. The specimen, which was composed of metastable austenite, ε‐martensite, and α′‐martensite, was uniaxially stretched at room temperature at a rate of 0.1 mm min −1 by using a scanning electron microscope installed with an in situ deformation stage. The interaction under study was distinctly demonstrated by the formation means of α′‐martensite under external stress. The thermal ε‐martensite plates could hardly thicken during deformation. Deformation‐induced α′‐martensite developed in ε‐martensite in two means, namely, nucleation in the intersection of two thin ε‐martensite plates and direct growth of preexisting thermal α′‐martensite on thick ε‐martensite plates. Good content consistency was observed between thermal and deformation‐induced martensite; this result quantitatively demonstrates the significant interaction between the two.