摘要 A novel approach to reduce Ni content for the 310S austenitic stainless steel was proposed. The nano-ceramic additive (L) was applied to 310S steel to replace part of Ni element and reduce the cost. By means of thermal simulation, X-ray diffraction, field emission scanning electron microscopy, and electron backscattered diffraction, the effects of nanoceramic additives on high-temperature mechanical properties and corrosion behavior of the 310S steel were studied. The results indicate that the morphology and density of the (Fe, Cr)23C6 carbides are varied, which play an important role in the high-temperature mechanical properties and corrosion behavior. After adding nano-ceramic additives, the high-temperature tensile strength and yield strength are improved simultaneously, in spite of a slight decrease in the total elongation. During high-temperature corrosion process, the mass gain of all the samples is parabolic with time. The mass gain is increased in the 310S steel with nano-ceramic additive, while the substrate thickness is significantly larger than 310S steel. The more stable and adherent FeCr2O4 spinel form is the reason why the high-temperature corrosion resistance was increased. The (Fe, Cr)23C6 carbides distribution along grain boundaries is detrimental to the high-temperature corrosion resistance.
Abstract：A novel approach to reduce Ni content for the 310S austenitic stainless steel was proposed. The nano-ceramic additive (L) was applied to 310S steel to replace part of Ni element and reduce the cost. By means of thermal simulation, X-ray diffraction, field emission scanning electron microscopy, and electron backscattered diffraction, the effects of nanoceramic additives on high-temperature mechanical properties and corrosion behavior of the 310S steel were studied. The results indicate that the morphology and density of the (Fe, Cr)23C6 carbides are varied, which play an important role in the high-temperature mechanical properties and corrosion behavior. After adding nano-ceramic additives, the high-temperature tensile strength and yield strength are improved simultaneously, in spite of a slight decrease in the total elongation. During high-temperature corrosion process, the mass gain of all the samples is parabolic with time. The mass gain is increased in the 310S steel with nano-ceramic additive, while the substrate thickness is significantly larger than 310S steel. The more stable and adherent FeCr2O4 spinel form is the reason why the high-temperature corrosion resistance was increased. The (Fe, Cr)23C6 carbides distribution along grain boundaries is detrimental to the high-temperature corrosion resistance.
Rong Zhu,Mai Wang,Zhen-li Mi, et al. Effects of nano-ceramic additives on high-temperature mechanical properties and corrosion behavior of 310S austenitic stainless steel[J]. Journal of Iron and Steel Research International, 2023, 30(03): 591-600.
2023, Vol. 30 
