biased sample
2.It has been already verified that the dcmestic T91 stedl tube is subject oreep bittleness tendency. This paper rpplies tho TEM rnd SEM observation methods to make a microstructural analysis of the residual sample. The research results indicate that the creep bittleness tendency of dsmestic T91 steel tube is related to the reduction of slioing dislocrtion density, ccrrsening of carbide, and biased accumulation of etrimental elements such Sb, Bi, etc.
