Effects of nano-ceramic additives on high-temperature mechanical properties and corrosion behavior of 310S austenitic stainless steel

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)_(23)C_(6)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 FeCr_(2)O_(4)spinel form is the reason why the high-temperature corrosion resistance was increased.The(Fe,Cr)_(23)C_(6)carbides distribution along grain boundaries is detrimental to the high-temperature corrosion resistance.