Low-cycle fatigue of chromium-manganese steel 03Kh13AG19 at low temperatures (293–4.2°K)

Conclusions

• 1. In the temperature range 293–4.2°K ductility characteristics of steel 03Kh13AG19, determined with short-term rupture tests, cannot clearly define its capacity for unilateral deformation with prolonged cyclic loading.

• 2. A reduction in temperature to 77°K does not make a qualitative change in the nature of deformation and failure for steel 03Kh13AG19. The intensity of directional plastic deformation processes only changes quantitatively; the capacity to resist cyclic creep is unchanged, and failure, the same as with T=293°K, over the whole endurance range proceeds as a result of formation and development of fatigue cracks to a critical size.

  An increase in cyclic strength on a background of a reduction in deformation realized to failure is accompanied by a reduction in the capacity of steel 03Kh13AG19 to resist fatigue failure.

• 3. Intense cooling to 4.2°K changes in principle the nature of deformation and failure for chromium-manganese steel. Deformation at T=4.2°K is accomplished as a result of interrupted yielding of the material in local areas of specimens, and accumulation of deformation to failure is sharply reduced with absence of directional plastic deformation processes clearly determined by deformation accumulated in the first cycle as a result of active loading.