Effect of Tempering Temperature on Strength and Fracture Toughness of 0.3C-CrMoV(ESR) Steel
| Periodical | Materials Science Forum (Volume 710) |
|---|---|
| Main Theme | Advances in Metallic Materials and Manufacturing Processes for Strategic Sectors |
| Edited by | S.V.S. Narayana Murty |
| Pages | 433-438 |
| DOI | 10.4028/www.scientific.net/MSF.710.433 |
| Citation | K. Saravanan et al., 2012, Materials Science Forum, 710, 433 |
| Online since | January, 2012 |
| Authors | K. Saravanan, R. Suresh Kumar, V.M.J. Sharma, D. Sivakumar, P. Ramkumar, P. Ramesh Narayanan, K. Sreekumar, Parameshwar Prasad Sinha |
| Keywords | 0.3C-CrMoV(ESR) Ultra-High Strength Steel, Fracture Toughness (KIc), Hardening, Rings, Tempering, Tensile Properties |
| Price | US$ 28,- |
0.3C-CrMoV(ESR) steel is an ultra-high strength low alloy steel indigenously developed by ISRO for space applications. The steel is used in the form of rings of 2.8 m diameter also. In this paper, the effect of tempering temperature on ring rolled steel for the best combination of fracture toughness and strength properties is studied. The tensile properties and fracture toughness of the steel were evaluated in the as quenched and tempered conditions through the specimens drawn in radial direction of the ring segment. Five tempering temperatures were used in the study: 200, 450, 475, 500 and 510°C. Tensile strength of the steel showed continuous decrease with increasing tempering temperature, but yield strength increased reaching maximum when tempered at 450ºC and further decreased with increasing tempering temperature. The elongation was higher for higher tempering temperature. The strain hardening exponent decreased with increasing tempering temperature. The fracture toughness test results showed that tempering between 475 and 510ºC exhibited better combination of fracture toughness and strength.
