Strength characteristics of 06Kh13N7D2 maraging steel at elevated temperatures

Abstract

1. Under elevated operating temperatures (300 and 350 °C) the strength characteristics (short-term strength and ductility, long-term strength, and fatigue resistance) of the new 06Khl3N7D2 constructional maraging steel necessary for soundly based use of it in critical parts for atomic power were obtained. 2. The loss of strength influence of long aging at 300 and 350 °C for 2000 h on the short-term strength, ductility, and fatigue resistance of the investigated steel was determined. It was established that a long hold at increased operating temperatures led to a reduction in the strength properties σt and σ0.2, which was greater (9–14%) for short-term strength. The change in the characteristics of ductility δ and ψ after aging is not the same: δ increases and ψ decreases. Long aging for 2000 h also caused a 15–30% reduction in fatigue resistance with a. base of 107 cycles.