Details

Autor(en) / Beteiligte

• Thomas, G.B.
• Gibbons, T.B.

Titel

Creep and fracture of a cast NiCr-base alloy containing trace elements

Ist Teil von

• Materials science and engineering, 1984-10, Vol.67 (1), p.13-23

Ort / Verlag

Lausanne: Elsevier B.V

Erscheinungsjahr

1984

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• The effects of trace amounts of bismuth, lead, selenium, tellurium and thallium on the creep and stress rupture performance of the cast alloy MAR-M 002 have been investigated at 850°C. The results show that, while each impurity (with the possible exception of thallium) has a harmful influence, bismuth and tellurium are the most detrimental; this is consistent with the greater tendency for these elements to segregate to grain boundary surfaces. Metallographic examination has shown that the presence of an impurity element caused an increased rate of production of grain boundary microcracks, which resulted in shorter lives to rupture and reduced ductility. The results are shown to be consistent with the fact that cavity nucleation is proportional to strain and it is suggested, on the basis of current models of cavity growth, that a larger effect of impurities on ductility would have been observed if tests had been performed at lower stresses.