Abstract
Samples of austenitic stainless steel DIN 1.4970 containing about 40 ppm of boron and a boron-free version of this steel were creep tested at 700 °C in both the solution-annealed and aged conditions to determine their creep ductility and strength. The microstructure before creep tests was determined using transmission electron microscopy. The distribution of boron in both the steels after solution annealing (SA) and aging was mapped by means of α-autoradiography. It has been observed that in the solution-annealed condition, the creep strength of 1.4970 steel is higher than that of the boron-free version; whereas after aging, the strength of 1.4970 steel is lower than that of the boron-free version. The creep ductilities were hardly influenced by the presence of boron. The results are discussed in terms of microstructure and boron distribution in the matrix.
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