A study of deformation and damage accumulation processes in 10GN2MFa steel under low-cycle loading

Abstract

A. A. Lebedev, I. V. Makovetskii, UDC 620.178.15/179.119 N. R. Muzyka, and V. P. Shvets The paper presents results of the experimental investigation of deformation behavior and damage accumulation kinetics in a heat-resistant reactor pressure vessel steel at high stress levels under stress-controlled (pulsating), low-cycle loading up to 10 4 cycles. Hardness measurements have been performed upon various operating time periods under elastoplastic deformation. It has been found that hardness and strength of the steel exhibit qualitatively different behaviors throughout the lifetime. The damage accumulation process in steels under static and cyclic loadings has been studied by means of the LM-hardness method. The curves of Weibull homogeneity coefficient vs. cycling stress and accumulated strains are obtained.

The kinetics of damage accumulation in heat-resistant steels under different loading conditions

“…The analysis of the results obtained shows that the Weibull coefficient of homogeneity m is the parameter more sensitive to the value of the accumulated creep strain, the level of the maximum stresses in a cycle and the number of cycles of operating time than the hardness of the steel under investigation similar to that previously noted for other metals and alloys in [5,6]. This regularity (Fig.…”

Studies on damage accumulation kinetics in a metal under cyclic loading in the multiaxial stress state

“…Analysis of experimental data confirms earlier obtained homogeneity factor (m) variation patterns relative to strain accumulation under loading [7]. Such patterns are typical of all ratios of principal stresses.…”

Effect of cyclic load on microstructure and cold resistance of the 10g2fb steel haz metal

“…By now, number of accidents due to specified metal condition is still large, regardless the significant success in study of mechanisms of the fatigue processes and development of methods for increase of life duration of the welded metal structures. Therefore, specific practical interest is paid to investigation of the processes and reasons reducing life duration of the materials under service conditions, in particular, with regard to fatigue damage of the structures, which is evidenced by publications of the recent years [3][4][5][6][7].…”