オーステナイト鋼の高温性質におよぼす Ti の影響

概要

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Following the previous report (Tetsu-to-Hagane 45, 1959, 11, p.1276), the effect of Ti and C on the mechanical properties (such as creep rupture strength, tensile strength and aging hardness) and the microstructure of 18 Cr-12 Ni austenitic stainless steel containing Ti were studied. The range of the C contents studied was from 0.06% to 0.49%, and that of the Ti contents was from 0% to 1.88%. With these steels, TiC and Cr_<23>C_6 precipitated during aging at 600, 650, 700 and 750℃. The aging hardness increased with increasing C contents and decreased with increasing Ti contents. When the Ti content was over four times as much as the C content, large granular TiC remained on grain boundaries. It seemed that this structure had a unfavorable effect on the mechanical properties. Precipitates were examined by the same method as described in the previous report. With the specimens with 0.06% and 0.12% of C, X-ray diffraction lines of TiC, TiN, τ phase which seemed Ti sulfide were obtained but with the specimens with higher C contents, TiN and τ phase were not detected. The tensile strength depended mainly upon the C content dissolved in the matrix. When the Ti content was about four times as much as the C content, the creep rupture strength was maximum for each C content.
社団法人日本鉄鋼協会の論文
1960-05-01