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Effect of Carbon Addition on Recovery Behavior of Trained FeMnSi Based Shape Memory Alloys
Author(s) -
Peng Huabei,
Chen Jie,
Wang Shanling,
Wen Yuhua
Publication year - 2015
Publication title -
advanced engineering materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.938
H-Index - 114
eISSN - 1527-2648
pISSN - 1438-1656
DOI - 10.1002/adem.201400193
Subject(s) - alloy , materials science , martensite , metallurgy , strain (injury) , microstructure , medicine
We investigate microstructures and recovery behavior of trained Fe14Mn5Si8Cr4Ni and Fe14Mn5Si8Cr4Ni0.12C alloys under different deformation strains by color optical micrographs, XRD, and SQUID. The training results in the formation of α′ martensite in Fe14Mn5Si8Cr4Ni alloy, while introduces Cr 23 C 6 particles besides the α′ martensite in Fe14Mn5Si8Cr4Ni0.12C alloy. The stress‐induced ε martensite bands are thinner in trained Fe14Mn5Si8Cr4Ni0.12C alloy than in trained Fe14Mn5Si8Cr4Ni alloy. When the deformation strain is below 8%, the recovery strain of trained Fe14Mn5Si8Cr4Ni0.12C alloy is slightly lower than that of trained Fe14Mn5Si8Cr4Ni alloy. This result is attributed to the fact that the M s temperature of Fe14Mn5Si8Cr4Ni0.12C alloy is much below the deformation temperature than that of Fe14Mn5Si8Cr4Ni alloy. When the deformation strain is above 8%, the recovery strain of trained Fe14Mn5Si8Cr4Ni0.12C alloy is higher than that of trained Fe14Mn5Si8Cr4Ni alloy. The reason for this result is that in trained Fe14Mn5Si8Cr4Ni0.12C alloy, both α′ martensite and Cr 23 C 6 particles prevent stress‐induced ε martensite bands from colliding each other at large deformation strain, and the width of stress‐induced ε martensite bands is smaller as compared with trained Fe14Mn5Si8Cr4Ni alloy. It is concluded that carbon addition can improve the recovery strain of trained FeMnSi based shape memory alloys at large deformation strain.