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- W3128696562 abstract "Iron-chromium alloys such as AISI-446 steel are widely used as heat-resisting and corrosion-resisting materials, but when the chromium content exceeds about 13%, the alloys become extremely brittle. This 475 deg. C brittleness is caused by the dissociation of ..cap alpha.. solid solution into two phases at the gaps of the solid solution below 550 deg. C, and the Cr-rich phase results in the brittleness of the alloys. The addition of certain rare-earth metals to the alloys may be effective for the improvement of the 475 deg. C brittleness. From this point of view, a series of experiments are in progress at the authors' laboratory. Tensile test specimens were prepared by melting in argon atmosphere, forging and rolling, shaping, vacuum solution treatment, and vacuum aging. The yield strength increased in two stages with the aging time in the alloys without rare-earth metal addition and with the addition and with the addition of yttrium or cerium. Yttrium increased the strength in the first stage, while cerium increased it in the second stage. The addition of either element has little influence in as-solution-treated specimens. In the alloys without the addition, the ultimate strain and total elongation decreased rapidly by the aging longer than 10 hours. In the alloys added with 0.1% yttrium, they remained unchanged by aging, and in the alloys added with 0.1% cerium, they tended to increase by aging. The addition of rare-earth metals of very small amount is effective for inhibiting the embrittlement." @default.
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- W3128696562 date "1976-03-01" @default.
- W3128696562 modified "2023-09-27" @default.
- W3128696562 title "Effects of rare-earth metals on the 475/sup 0/C brittleness of Fe-30% Cr alloy" @default.
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