Hydrogen transport and embrittlement in 300 M and AerMet100 ultra high strengthsteels

摘要

This paper describes how hydrogen transport affects the severity of hydrogenembrittlement in 300 M and AerMet100 ultra high strength steels. Slow strainrate tests were carried out on specimens coated with electrodeposited cadmiumand aluminium-based SermeTel 1140/962. Hydrogen diffusivities were measuredusing two-cell permeation and galvanostatic charging methods and values of 8.0 ×10−8 and 1.0 × 10−9 cm2 s−1 were obtained for 300 M and AerMet100, respectively.A two-dimensional diffusion model was used to predict the hydrogen distributionsin the SSR specimens at the time of failure. The superior embrittlementresistance of AerMet100 was attributed to reverted austenite forming aroundmartensite laths during te