Details

Autor(en) / Beteiligte

• ABE, Fujio

Titel

Effect of fine precipitation and subsequent coarsening of Fe2W Laves phase on the creep deformation behavior of tempered martensitic 9Cr-W steels

Ist Teil von

• Metallurgical and materials transactions. A, Physical metallurgy and materials science, 2005-02, Vol.36 (2), p.321-332

Ort / Verlag

New York, NY: Springer

Erscheinungsjahr

2005

Quelle

SpringerLink_现刊

Beschreibungen/Notizen

• The effect of fine precipitation and subsequent coarsening of Fe2W Laves phase on the creep deformation behavior was investigated for simple 9Cr-W steels containing 0, 1, 2, and 4 wt pct W. After tempering, the specimens were subjected to creep tests at 823, 873, and 923 K for up to 15,000 hours. The precipitation of Fe2W Laves phase takes place during creep at boundaries from the supersaturated solid solution of the high-W steels, the 9Cr-2W and 9Cr-4W steels, but not in the low-W steels, the 9Cr-0W and 9Cr-lW steels. The fine precipitation of Fe2W Laves phase decreases the creep rate in the primary or transient creep region, while the subsequent large coarsening of Fe2W Laves phase reduces the precipitation strengthening and promotes the acceleration of creep rate in the tertiary or acceleration creep region after reaching a minimum creep rate. The change in shape of creep rate curves with stress and temperature is explained by taking fine precipitation and subsequent coarsening of Fe2W Laves phase into account.