Preliminary deformation effect on yield strength of austenitic steel under low temperature loading

Changes are studied in the yield point and structural characteristics of 12Kh18N10T austenitic steel resulted from prior plastic deformation up to various levels (0.3-10 %) at 300 K and repeated low-temperature loading (at 77 K) up to 0.2% deformation. It is established that density of structural defects in austenite, the defects being resulted from prior strain at room temperature, affects the peculiarities of changes in the steel substructure at low-temperature loading and the value of low-temperature yield point. The yield point in the range of small (< 2%) values of prior strain is shown to essentially decrease