Degradation of Mechanical and Structural Properties of Steel T23

Abstract

This paper deals with changes in mechanical and structural properties of Steel T23 during long-time annealing at high temperatures. The research is focused on the degradation of the base material (steel T23), where the samples of steel, after the initial heat treatment, were annealed at temperatures of 600, 650 and 700 °C for 10 to 10 000 hours in a furnace with air atmosphere. This contribution summarizes the experimental results of mechanical and structural measurements and gives the relations between them.

Microstructural evolution and mechanical properties of Grades 23 and 24 creep strength enhanced ferritic steels

“…Svobodova et al . 23 observed similar results for changes in short term properties when aging was conducted at 650°C (1202°F) for 10 000 h. The strength and charpy impact energy are shown as a function of test temperature for the as-received and aged conditions in Figs. 16 and 17.…”

“…Furthermore, the lack of detailed microstructural characterisation makes interpretation of the results difficult. The large reduction in creep life may be associated with accelerated recovery of the bainitic matrix that is known 18,23,24 to have a detrimental effect on creep resistance.…”

“…Furthermore, the lack of detailed microstructural characterisation makes interpretation of the results difficult. The large reduction in creep life may be associated with accelerated recovery of the bainitic matrix that is known 18,23,24 to have a detrimental effect on creep resistance.

16 Ultimate tensile strength and yield strength versus temperature for T23 aged at 650°C (1202°F)/10 000 h and compared to as-received T23. Adapted from Svobodova et al .

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“…Ultimate tensile strength and yield strength versus temperature for T23 aged at 650°C (1202°F)/10 000 h and compared to as-received T23. Adapted from Svobodova et al23 17 Charpy impact toughness versus temperature for T23 aged at 650°C (1202°F)/10 000 h and compared to asreceived T23. Adapted from Svobodova et al23 18 Stress rupture tests for T23 aged at 650°C/10 000 h and compared to as-received T23.…”

“…Adapted from Svobodova et al23 17 Charpy impact toughness versus temperature for T23 aged at 650°C (1202°F)/10 000 h and compared to asreceived T23. Adapted from Svobodova et al23 18 Stress rupture tests for T23 aged at 650°C/10 000 h and compared to as-received T23. Adapted from Svobodova et al23 DuPont et al Microstructure and properties of Grades 23 and 24 International Materials Reviews 2017 VOL 62 NO 1…”