微量の B 及び Zr を単独または複合添加した Ni-26 Cr-17 W 合金のクリープ破断特性

概要

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Creep rupture tests were carried out at 1000℃ in air on the Ni-26Cr-W alloys containing small amount of B and/or Zr, and the effect of the minor elements addition on the creep rupture properties was investigated in relation to the microstructure. The results obtained were summarized as follows ; 1. A minimum creep rate was decreased remarkably through small addition of B. This is attributed to the uniform and fine dispersion of M_<23>C_6 in a grain during creep deformation. The state was kept at least up to 2500 h. 2. A rupture ductility was improved by a small addition of Zr. This seems to result from the increase of the surface energy for cracking at the grain boundary through the Zr addition. 3. Owing to (1) and (2), the alloy containing a small amount of B and Zr showed better creep rupture properties than the alloys solely with B or Zr. Its rupture life was longer than that of 113MA (Ni-23Cr-18W) and the life difference was apt to become larger with decreasing in the applied stress.
社団法人日本鉄鋼協会の論文
1989-01-01