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The Local Characterization of Individual Phase Mechanical Properties Using Nano‐Indentation and In Situ Scanning Probe Microscopy in an Advanced High Strength Steel
Author(s) -
KaramAbian Mahdi,
ZareiHanzaki Abbas,
Abedi Hamid Reza
Publication year - 2017
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.201600274
Subject(s) - materials science , austenite , martensite , indentation , indentation hardness , modulus , characterization (materials science) , nanoindentation , composite material , phase (matter) , deformation (meteorology) , pile , elastic modulus , metallurgy , structural engineering , microstructure , nanotechnology , engineering , chemistry , organic chemistry
This study reports the nano‐hardness and reduced elastic modulus of martensite and retained austenite in an advanced high strength steel considering the possible pile‐up or sinking‐in effects. The main goal is to estimate the real contact area of the indenter under the various loading condition. The results can be utilized to modify the Oliver and Pharr method. In order to highlight the pile‐up or sinking‐in effects, the tests are conducted under the maximum loads of 3, 5, 7, and 10 mN. The results indicate that the indentation size introduce a significant effect on the accuracy of hardness measurement. Interestingly, the difference of pile‐up in retained austenite and blocky martensite is negligible and starts decreasing by raising the applied force. This is properly justified considering the occurrence of strain‐induced transformation in an unstable retained austenite.