Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels

Abstract

Abstract: By controlling the carbon content of Fe-15Cr-25Ni alloys,three types of microstructures were obtained:single phase austenite (γ),γ+intergranular carbides, γ+intergranular carbides + intragranular carbides. Creep crack growth behaviour of the three alloys has been compared at 973 K and 1123 K. Intergranular carbides show higher creep crack growth resistance than intragranular carbides.Cav- ities nucleate at the triple junctions of grain bound- aries for single phase alloy,but at intergranular carbides for two-phase alloys.The precipitation of intergranular carbide not only changes the nucleation mechanism of cavities,but also inhibits the growth and coalescence of cavities.The precipi- tation of intragranular carbide obstructs the nucleation and growth of cavities furthermore.

Key words: Ni-Cr austenitic steel, creep, crack growth, carbide

ZHU Suming ZHU Shijie WANG Fugang ZHANG Junshan ** Dalian University of Technology,Dalian,116024,China*** Institute of Metal Research,Academia Sinica,Shenyang,110015,China+ To whom correspondence should be addressed. Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels[J]. J Mater Sci Technol, 1992, 8(6): 391-396.

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Carbide Effects on Creep Crack Growth of Ni-Cr Austenitic Steels

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