Home FOR AUTHORS Kovove Materialy-Metallic Materials 2010 Metallic Materials Vol. 48 (2010), no. 4, pp. 233 -239

Journal info

Select Journal







Webshop Cart

Your Cart is currently empty.

Info: Your browser does not accept cookies. To put products into your cart and purchase them you need to enable cookies.

Metallic Materials Vol. 48 (2010), no. 4, pp. 233 -239

Title: An improved, stress-dependent, energy-barrier model for the creep of 9Cr-1Mo-0.2V steel under disc-bend loading
Author: NAGODE, A., ULE, B., KOSEC, L., JENKO, M.

Abstract:

  In this paper we describe the creep behaviour of 9Cr-1Mo-0.2V steel under disc-bend loading, also known as the small-punch method. An improved power-law, stress-dependent, energy-barrier model was used to describe the creep behaviour of 9Cr-1Mo-0.2V steel because the characteristics of this steel cannot be accurately described using a simple, Arrhenius-type power law. A good correlation between the calculated values from the improved model and the experimental data was obtained for discs of different thickness, i.e., 0.50 mm, 0.47 mm and 0.44 mm. We found that the optimum disc thickness for our small-punch device was 0.50 mm. The stress-dependent, apparent activation energy of creep for a disc thickness of 0.50 mm decreased from ∼543 kJ mol-1 to ∼535 kJ mol-1 as the load increased from 350 N to 550 N, with the load exponent equal to 4.5. These values are very close to the results from conventional, uniaxial creep tests.



Keywords: Small-punch, 9Cr-1Mo-0.2 V steel, creep equation, stress-dependent activation energy, Monkman-Grant relationship
Year: 2010, Volume: 48, Issue: 4 Page From: 233, Page To: 239
doi:10.4149/km_2010_4_233


download file



© AEPress s.r.o
Copyright notice: For any permission to reproduce, archive or otherwise use the documents in the ELiS, please contact AEP.