Research Article
Specific Features of Structural-Phase State and Properties of Reactor Pressure Vessel Steel at Elevated Irradiation Temperature
Table 3
Results of fractographic analysis for 15Kh2NMFAA steel specimens in different states.
| State, | Specimen number | , °C | Absorbed energy, J | Portion of different fracture modes (%) | Grain | η, % | Ductile | Quasi-cleavage | Cleavage | Brittle intergranular fracture |
| As-received | 3115 | | 18 | — | 80 | 20 | — | 50 | 0 | 31110 | | 37 | 5 | 75 | 20 | — | 100 | 31111 | | 12 | — | 80 | 20 | Traces | 50 | 31112 | | 127 | 40 | 55 | 5 | Traces | 50 | 3114 | | 169 | 40 | 50 | 10 | — | 50 | 3113 | | 201 | 65 | 30 | 5 | — | 100 |
| Segregation provoking treatment | 315-12 | | 22 | — | 70 | 15 | 15 | 100 | 30 | 315-11 | | 55 | 15 | 55 | 10 | 20 | 100 | 315-3 | | 9.9 | 5 | 55 | 10 | 30 | 50–100 | 315-8 | | 9.5 | 10 | 60 | 15 | 15 | 50–100 | 315-10 | | 169 | 30 | 40 | Traces | 30 | 100 | 315-7 | | 118 | 25 | 45 | 10 | 20 | 100 | 315-2 | | 186 | 40 | 40 | 5 | 15 | 50–100 |
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the direction of crack propagation. η is the maximum portion of brittle intergranular fracture for the state.
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