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

the direction of crack propagation.
η is the maximum portion of brittle intergranular fracture for the state.