An improved, stress-dependent, energy-barrier model for the creep of 9Cr-1Mo-0.2V steel under disc-bend loading

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

Using of transpassive dissolution for detection of structural changes in 9Cr–1Mo creep resistant steel

“…According to other authors [1][2][3][4][5][6] carbides M 23 C 6 type (M5Fe, Cr, Mo) are formed in the structure. Moreover,…”

“…Recently common temperatures of steam range between 540 and 565uC, but efforts of increasing it to 600-620uC have been made. [1][2][3][4] However, an increase of parameters of entering steam leads to higher requirements to properties of the structural materials used.…”

Stainless Steel Processing to Meet Advanced Applications

“…The elevated temperature mechanical properties of some of the grades of interest at KCSSL is shown in Fig. 12(a)-(c), where comparative merits of the various grades are brought out [18,19]. It is seen the austenitic grades have better strength than martensitic and ferritic grades.…”

“…A Century of Stainless Steels Fig. 12 Typical high temperature mechanical properties of some of stainless steels [18,19].…”

“…Fig 13. Stress Rupture Curves for 10000h for (a) austenitic and (b) martensitic stainless steels grades[18,19] …”