Resistance to low-cycle failure of OKh16N15M3B steel in tests with holds under reactor irradiation conditions

Kiselevskii, V. N.; Kharitonov, D. F.; Samsonov, B. V.; Rogozyanov, A. Ya.; Losev, N. P.

doi:10.1007/bf00768644

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“…Results obtained for cyclic life of the steel against the strain range are given in Fig. 7 [12]. As seen in Fig.…”

Section: Fatigue Lifementioning

confidence: 99%

“…Bearing in mind the above considerations, equation (12) may be written for the in-reactor steel in the following form: …”

Section: (8)mentioning

confidence: 99%

“…If there is no hold-time in a cycle, i.e. when t, = to, equation(12) takes the form of a power function for cyclic life vs plastic strain range per cycle. The value of the power index S estimated from reference hold-time test results is equal to -0.19.…”

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confidence: 99%

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IN‐REACTOR LOW‐CYCLE FATIGUE OF TYPE 0Kh16N15M3B STAINLESS STEEL

Kiselevsky¹,

Kharitonov²

1984

Fatigue Fract Eng Mat Struct

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An investigation has been carried out on austenitic stainless steel OKh16N15M3B under normal conditions and also to neutron irradiation of 6.8 x 10I6 nm-2 s-' ( E 0. I MeV) intensity. Thin-walled torsion cylindrical specimens were tested in straincontrolled fully reversed loading mode at 923 K. Various ranges of strain, pre-loading fluences and half-cycle hold times (1, 5 and 30min) were applied. Neutron irradiation was found to result in hardening of the steel, stimulating cyclic stress relaxation and a reduction in cyclic life. When acting together, neutron irradiation and static loads cause a more significant reduction in the number of cycles to failure than if summed up as independent factors. Application of a kinetic failure criterion based on a damage parameter enables an estimation to be made of the limiting state of the steel under high-temperature cyclic loading with hold periods. NOMENCLATUREFr = failure fluence Fa = pre-loading fluence FN = F1 -Fa = loading fluence (fluence accumulated under loading) N / = number of cycles to failure n = cycle number T = temperature t = time t , = cycle period to = cycle period in no-hold-time tests t H = hold time td = t,/tO = dimensionless cycle period v = loading frequency y = shear strain y, = creep strain y p = plastic strain y , = total strain Ay = strain range Af = corrected strain range cr,, = yield stress cru = ultimate strength T = shear stress T,, = maximum stress in a cycle r^ = stress measured from the point of unloading AT = stress range AT" = stress decrease during hold time 6 =tensile elongation to fracture o = damage o, = static damage w f = fatigue damage I// = reduction of area; in tension A T~/ T~ = the degree of stress relaxation A,

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“…Results obtained for cyclic life of the steel against the strain range are given in Fig. 7 [12]. As seen in Fig.…”

Section: Fatigue Lifementioning

confidence: 99%

“…Bearing in mind the above considerations, equation (12) may be written for the in-reactor steel in the following form: …”

Section: (8)mentioning

confidence: 99%