High-temperature fatigue life of type 316 stainless steel containing irradiation induced helium

Abstract

Specimens of 20^-cold-vorked AISI type 316 stainless steel were irradiated In the High Flux Isnt *>r»o R*-.i<"tf>r ('tiy'.ii) .it 550 °C to a aiKimum darr, i;»e level of 15 dpa and a transmit at ion proi.ur.fi h.' I i» J ~ i.'vel :>f d2o ji, ppm-r'ul 17 reversed st r.iin control 1od fat i ,MIC tests w<?r.' p.'r;"onn- .-(i In a v,ir U in ,ic i50*C. No sl,;nif lonnt «;f:"cct ot the lrrrtdi.it ion on lowcycle fatigue life was obsi-rvt-ii; howvvcr, the strain r.in^u of tho ]0 7 cycle endur-m- .-Umi*. liccroased f row 0.15 to 0.30£. Tho relation between tot JI st till n rang**-and nun: her of cycles to failure was found to be Ae T • 0.02 *r Q * 12 * N^0-6 for » f < 10 7 cycles. INTKODUCTIOM Since almsr. all conceptual designs of tok.imalc fusion reactors employ cyclic operation, tho

Fatigue properties of F82H irradiated at 523 K to 3.8 dpa

“…6, the fracture mode of the irradiated specimen fatigue-tested with De t of 0.5% was found to be a channel fracture. Channel fracture [15][16][17] and similar cleavage fracture [18,19] were reported after fatigue tests at De t of about 0.5% in irradiated austenitic stainless steels. In martensitic steels tested by cyclic stress, however, channel fracture has not been reported previously.…”

Bend-fatigue properties of 590 MeV proton irradiated JPCA and 316F SS

“…However, it is possible to discuss the irradiation effects on fatigue life. Some authors [5][6][7] report that fatigue life is reduced by irradiation. On the other hand, Puzzolante [8] concluded that there is little or no effect of irradiation on the fatigue life.…”

“…There are limited data on the fatigue life of irradiated austenitic stainless steels [5][6][7][8], with all of the data obtained by axial strain fatigue tests. There are no data on bend-fatigue life of irradiated specimens.…”

The influence of helium on the bulk properties of fusion reactor structural materials

“…The situation can be quite different in the case of fusion devices where ICFRs and the next generation of tokamaks are expected to employ cyclic operation, [99,100];. and where very high helium production rates are expected in addition to the atomic displacements.…”