Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : September 09, 2018 - September 12, 2018
In order to establish a remaining life evaluation method for high temperature facilities made of stainless cast steel, creep-fatigue tests for a stainless cast steel (Fe-0.4C-35Ni-25Cr-1Mo) were conducted, and the crack initiation and propagation behavior were investigated. Transgranular cracking occurred under PP (fast-fast) type of loading. On the other hand, many voids and their coalescence were observed on the grain boundaries, and intergranular cracking occurred under CP (slow-fast) type of loading. The crack propagation rate and the fatigue life under CP type of loading were higher and shorter than those under PP type of loading. The relations between the crack length and the life ratio can be described by the crack propagation model based on the strain range partitioning concept within a factor of 2 scatter bands.
