Development of Hardening and Tempering Cycle for High Strength Low Alloy Fastener Grade Steel

Abstract:

Medium carbon low alloy Ni-Cr-Mo steel is used in the fabrication of aerospace fasteners. It finds application in different heat treated conditions to meet the desired strength level. The alloy was realized through double melting route. Heat Treatment studies have been carried out by following different tempering temperatures to obtain varying strength levels ranging from 1200MPa to 1400MPa. Microstructural analysis has been carried out to find out reasons for variation in mechanical properties. Tempering cycle has been suggested to obtain fully tempered martensitic structure. This paper presents the different hardening and tempering cycles studied to obtain the desired strength level for the intended application.

• Periodical: Materials Science Forum (Volume 710)
• Pages: 506-510
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.710.506
• Online since: January 2012
• Authors: M. K. Kathikeyan, R.K. Gupta, V. Anil Kumar, P. Ramkumar
• Keywords: ESR, Fastener, HSLA Steel, Ni-Cr-Nb Steel

References

[1] R. K. Gupta, B. R. Ghosh, D. N. Bhatia, P. P. Sinha, CIM Bulletin, 100 (1102) (2007) 1-4.

[2] T. V. Rajan, C. P. Sharma and A. Sharma, Heat treatment principles and techniques, Prentice Hall of India (Pvt. Ltd.) pub., New Delhi, 1995.

[3] D. S. Clark and W. R. Varney, Physical Metallurgy for Engineers, affiliated East-West Press (Pvt. Ltd.) pub., New Delhi, 1962.

[4] A. G. Guy, John J Hren, 'Elements of Physical metallurgy ' Oxford and IBH publication, New Delhi, 1973.

[5] Information on http://www.sz-metal.si/products/steels/35NCD16.htm