Microstructure and thermomechanical pretreatment effects on creep behaviour of helium-implanted DIN 1·4970 austenitic stainless steel

Abstract

Microstructure investigations were carried out on unimplanted and 150 at.ppm helium implanted foil specimens of DIN 1-4970 austenitic stainless steel after various thermomechanical pretreatments. Creep tests were also carried out for both helium-implanted and unimplanted specimens at 700°C and 800°C. The strength, ductility and rupture time are correlated with the dislocation and precipitate distributions. Helium embrittlement can be reduced in these experiments when dispersive TiC precipitate distributions are produced by proper pretreatments or allowed to form during creep test.

Effect of Fe and C doping on the thermal release of helium from aluminum

“…Various ways have been explored, e.g. thermomechanical treatment [1], cold working [2], introduction of secondary phases [3] and oxide dispersion strengthening [4]. A remarkable improvement has been achieved by the last two ways, which can be realized by doping alloying elements in metals [3,4].…”