Table 2 C, Al and Nb contents of samples (%) Table 3 C, Al and Nb contents of samples (%) Table 4 C, Al and Nb contents of samples (%) 6
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1 Study on the Weldability of Ni Base Superalloy (Part 7) Improvement of Hot Crack Sensitivity of Inconel 713C and its Mechanical Properties by Hiroshi Ikawa, Shigeo Shin, Yoshikuni Nakao, Haruo Yawata and Toru Miyoshi Abstract 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 Ž 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.
2 Table 2 C, Al and Nb contents of samples (%) Table 3 C, Al and Nb contents of samples (%) Table 4 C, Al and Nb contents of samples (%) 6
3 Table 5 C, Al and Nb contents of samples (%) Table 6 C, Al and Nb contents of samples (%) Fig. 1 Effects of Al and Nb on the formation of massive white constituent 7
4 Fig. 2 Effect of C on the critical formation curve of massive white consittuent Fig. 3 Effects of Nb and C on the formation of massive white constituent : Massive white constituent is observed. œ: Massive white constituent is not observed. ~ : Free Nb content Fig. 4 Effects of Nb and C on the formation of massive white constituent : Massive white constituent is observed. œ :Massive white constituent is not observed. ~ : Free Nb content
5 Table 7 Chemical compositions of materials (%) * Nb+Ta, * 9
6 1278論 文 井 川,新,中 尾,八 幡,三 好:Ni基 耐 熱 合 金 の溶 接 性 に関 す る研 究(第7報) * Aimed Photo. 1 Results of bead-on-plate tests for Heat V-9, and V-36-l after dye penetrant inspection Photo. 以 上 によ り,γ'相 2 Results of bead-on-plate V-25-3 after dye penetrant 形 成 元 素 で あ るAlの ず る こ と はInconel713Cの ベ ル の 合 金 に つ い てCの 影 響 を み た.4.5%AIレ ベル 験 に 供 し た.こ い てCの し てC含 なると ー ドた て わ れ 有 量 が0.13%以 上 に な る と, ー ド部 な ら び にHAZと 標 準 組 成(6.1%)の も高 温 Cを0,13%添 合 金 で は ビ ー ド部,HAZと わ れ,な 験 に よ って ら び にHAZか 認 め ら れ る.し に な る と,HAZか 真 は いず れ も染 料 浸 透検 査 後 ベ ル の合 金 で は も,ビ ー ドた て わ れ,よ 有 量 が 高 く な っ て0.2% ら ビ ー ド部 へ と つ ら な る 少 数 の わ れ と ビ ー ドた て わ れ の み と な る.そ ベル の 合 金 の 結 果 で あ る.こ 以 上 に な る と 組 織 検 鏡 に よ っ て も ビ ー ド部,HAZと 0.005%Cの 合 金 で は ビ ー ド 部 な ら び にHAZに し てC含 に わ れ は 観 察 さ れ な く な る,Photo.5は 多数 10 こ ら ビ ー ド部 へ と 連 続 した わ れ が か し さ ら にC含 の ビ ー ド部 近 傍 を 示 し て い る.Photo.3は4.5%Alレ の 写 真 に み ら れ る よ う に, も多 加 す る と わ れ は 防 止 さ れ る が,6%AIレ ベ ル の 合 金 で は0.13%Cで 高 温 わ れ 感 受 性 の 改 善 に お よ ぼ すCの 合金につ 連 の 写 真 に み られ 数 の わ れ が 発 生 し て い る.4.5%Alレ れ らの 化 示 す. 効 果 を み た も の で あ る.写 有 量 が0.06%に 影 響 を み た も の で あ る.一 る よ う に,0.06%Cの れ らの 合 金 は い ず よ び4はBead-on-plate試 and は ほ と ん ど わ れ は 認 め ら れ ず,ビ 有 量 がInconel713Cの ま た6%Al れ も 高 周 波 真 空 溶 解 に よ り 溶 製 した も の で,そ V-8 わ れ は ま っ た く 観 察 さ れ な く な る.Photo.4はAl含 レ ベ ル の 合 金 と し て は 合 金V-3,V-8,V-27-1,一2,一3 Photo.3お V-6, V-28-4 No filler metal 組 織 検 鏡 に よ って も,ビ らび に6%Alレ の 合 金 と し て は 合 金V-25-1,-2,-3,-4を Incone1713Cの inspection HAZに 高温 わ れ 感受 性 の 改 善 に お よ 影 響 に つ い て の べ る.4.5%な 学 組 成 をTable8に tests for Heat の み に な る.そ つぎ にInconel713Cの をBead-on-plate試 V-28-1, V-28-3, No filler metal の わ れ が 発 生 し て い る が,C含 含 有 量を減 高 温 わ れ 感受 性 を低 減 させ る の に 有 効 と い え る. ぼ すCの composition 有 量 が0.3% も イン コネ ル 合
7 溶 接 学 会 誌 第39巻(1970)第12号1279 Table 8 * Aimed Chemical compositions of materials (%) composition Photo. 3 Results of bead-on-plate tests for Heat V-25-1, V-25-2, V-25-3 and V-25-4 after dye penetrant inspection No filler metal * Aimed Photo. 4 Results of bead-on-plate tests for Heat V-3, and V-27-3 after dye penetrant inspection 金 の 溶 加 棒 と し て 推 奨 さ れ て い るIncone162を と して 合 金V-3,V-27-1,-2,-3につ composition V-8, V-27-1, V-27-2 No filler metal 試 験 を行 な った 結 果 で あ る.こ れ か らい え る こ とは,上 溶 加棒 述 と同 じよ う に,C含 い てBead-on-plate 11 有 量 を増 せ ば ビー ド部 お よ びHAZ
8 1280論 文 井 川,新,中 尾,八 幡,三 好:Ni基 耐 熱 合 金 の 溶接 性 に 関す る研 究(第7報) * Aimed Photo. Fig. 5 5 Results of bead-on-plate V-27-3 after Effects No of Al tests for Heat dye penetrant and Nb cracking, ~ on the hot 以上 か ら,Inconel713Cの は,Inconel713Cの sensitivity metal of V-27-2 and : Inconel various 62 alloys 相 生成 限 界 曲線 の グ ラ フ上 に,Bead-on-plate試 り,た の組 成 はInconel713Cと 高 温 われ感受性を改善す お よ びC含 有 量 を 増 す こと 験 によ ほ ぼ 同 じで,Al,Nb 有 量 を 種 々変 えた 合 金 に つい て,高 温 わ れ の 発 生 の 有 無を 判 定 した 結 果 を図 示 した もの で あ る.グ 高 温 わ れ 感 受 性 を 低 減 させ るの に ラフ 上 の塊 状 白色 相 生 成 限 界 曲 線 か ら右側 は塊 状 白 色相 きわ め て 有効 と いえ る. Fig.5(a) (d)は crack V-27-1, Filler Cracking の 高温 わ れ感 受 性 は低 下す る とい う こ とで あ る. る第二 の方 策 と して 考 え ら れ たC含 V-3, inspection composition が 生 成 さ れ る領 域 で あ る.Fig.5(a) (d)を 第2節 の 実 験 よ り 求 めた 塊 状 白 色 12 み る と,
9 Fig. 6 Specimen for high temperature tensile test G.L.=40 mm Table 9 Chemical compositions of materials (%) 13
10 Fig. 7 Effect of C on the high temperature tensile strength of Inconel 713C Fig. 8 Effect of C on the elongation and reduction of area of Inconel 713C Fig. 9 Specimen for creep rupture test G.L.=30 mm Fig. 10 Effect of Al on the creep rupture strength at 816 Ž of Inconel 713C Fig. 11 Effect of C on the creep rupture strength at 816 Ž of Inconol 713C 14
11 Fig. 12 Effect of C on the creep rupture strength at 982 Ž of Inconel 713C
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