Authors: Dipika R Barbadikar A R Ballal D R Peshwe M D Mathew
Publish Date: 2015/06/12
Volume: 46, Issue: 8, Pages: 3448-3459
Abstract
Ball indentation BI technique has been effectively used to evaluate the tensile properties with minimal volume of material In the present investigation BI test carried out on P92 steel 9Cr05Mo18W using 076 mm diameter silicon nitride ball indenter was modeled using finite element FE method and analyzed The effect of test temperature 300 K and 923 K 27 °C and 650 °C tempering temperature 1013 K 1033 K and 1053 K 740 °C 760 °C and 780 °C and coefficient of friction of steel 00 to 05 on the tensile strength and material pileup was investigated The stress and strain distributions underneath the indenter and along the top elements of the model have been studied to understand the deformation behavior The tensile strength was found to decrease with increase in tempering and test temperatures The increased pileup around the indentation was attributed to the decrease in strain hardening exponent n with increase in the test temperature The pileup height determined from profilometry studies and FE analysis as well as the load depth curve from BI and FE analysis was in agreement The maximum strain location below the indentation changes with the test temperature Stress–strain curves obtained by conventional tensile BI test and representative stress–strain concepts of FE model were found exactly matchingThe authors are grateful to UGCDAECSR for financial support The first author is thankful to Dr G Amarendra ScientistIncharge UGCDAE center Kalpakkam node for extending the facilities and Dr R K Paretkar Dr K Laha Mr T Sakthivel Mr Sunil Goyal Mr Shashwat Mr Arvinth Davinci Mr J Ganesh Kumar and Mr N S Thampi for technical discussion and support
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