Ni 基耐熱合金の溶接性に関する研究(第 7 報) : Inconel 713C の高温われ感受性の改善と機械的性質

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The effects of Al, Nb and C on the formation of white constituents were examined first. And on the basis of the results (Fig. 2), the methods of improving the hot crack sensitivity of Inconel 713C were inquired into. The effects of valid elements to improve the hot crack sensitivity of Inconel 713C on the mechanical properties of Inconel 713C were investigated. The conclusions obtained in this study are as follows; (1) The formation of white constituents is arrested with an increasing C content or with decreasing Al and Nb contents. Fig. 2 shows critical formation cruves of white constituents. (2) The hot crack sensitivity of Inconel 713C can be improved by increasing the C content or decreasing the Al content. (3) The hot crack sensitivity of Inconel 713C can be estimated by Fig. 2 on the basis of Al, Nb and C contents in Inconel 713C. (4) The creep rupture strength at 816℃ of Inconel 713C lowers when decreasing the Al content from 6.1% (nominal composition of Al in Inconel 713C) to 4.7%. (5) The effect of C on the creep rupture strength and high temperature tensile strength of Inconel 713C is not recognized, C content being varied from 0.12% to 0.4%. (6) The elongation and reduction of area of high carbon Inconel 713C are poor. From a view-point of ductility, it is desirable to lower the C content in Inconel 713C. Finally, adding 0.2∿0.3%C to Inconel 713C is effective to improve the hot crack sensitivity of Inconel 713C without lowering mechanical properties.
社団法人溶接学会の論文
1970-12-25

Ni 基耐熱合金の溶接性に関する研究(第 7 報) : Inconel 713C の高温われ感受性の改善と機械的性質

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