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Influence of pre-straining on mechanical properties of HSLA steel by using ball indentation technique

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Published/Copyright: February 10, 2022

Abstract

Ball indentation technique has been employed to explore the possibilities for revealing the effect of pre-strain on mechanical properties of two groups of high-strength low-alloy steels. These steels were pre-strained up to 5%. Results are presented here for 1, 3, 4, and 5% of pre-strain effect on these steels. The dependence of yield strength, ultimate tensile strength, strength coefficient, strain-hardening component and true stress–strain curves on pre-straining effect are available from the ball indentation test, and they are validated with the standard mechanical test results. It is found that the increment of the pre-straining effect results in an increment of the yield strength and ultimate tensile strength values, while strength coefficient and strain-hardening component values are decreased. The existence of Lüders bands in the conventional stress–strain curves is also revealed in ball indentation test by the presence of the Lüders strain surrounding the indentation profile. In the conventional test it is found that the amount of Lüders bands is decreasing with increasing pre-strain. Similarly, Lüders strain as well as pile-up/sink-in of materials surrounding the indentation decrease as the pre-straining increases. It is found that ball indentation technique can be effectively used to determine the minute changes of mechanical properties due to introducing small amount of pre-straining.


Dr. Goutam Das National Metallurgical Laboratory Jamshedpur 831007, India Tel.: +91 657 227 1710 2138 Fax: +91 657 227 0527

  1. The authors would like to thank Dr. S. Tarafder, Dr. Surendra Kumar, Dr. Siva Prasad and Shri P. K. Dey for their help and stimulating discussions. One of the authors is also grateful to the CSIR for offering senior reseach followship to carry out this work. They wish to express their gratitude to Prof. S. P. Mehrotra, Director, NML for encouragement and permission to publish this work.

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Received: 2004-02-27
Accepted: 2004-09-17
Published Online: 2022-02-10

© 2004 Carl Hanser Verlag, München

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