Abstract
Abstract Helium concentration dependence of embrittlement effects in DIN 1.4970, 13% cw austenitic steel were studied in creep tests at 873 K after hot pre-implantation at the same temperature (10–1000 appm He). The results show that there are evident helium embrittlement effects (i.e. reduced creep rupture times and ductilities) in this material and the effects increase with increasing helium concentration. All specimens rupture in a mixed mode of trans- and intergranular fracture. TEM investigation of helium bubble structures in the present material indicate that: (a) in the grain matrix both helium bubble densities and sizes increase with increasing helium concentration; (b) at grain boundaries helium bubble sizes also increase with increasing helium concentration, while the densities remain constant; (c) the helium bubble density at primary TiC precipitate-matrix interfaces is much larger than that at grain boundaries, while the mean size is smaller.
Published Version
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call