高温高圧純水環境下の600合金用被覆アーク溶接金属の応力腐食割れ感受性に及ぼす化学成分, 熱処理の影響

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  • Effects of Chemical Compositions and Heat Treatment on Stress Corrosion Cracking Susceptibility of Shielded Metal Arc Weld Metals for 600 Type Alloy in High Temperature Pressurized Pure Water
  • コウオン コウアツ ジュンスイ カンキョウ カ ノ 600 ゴウキンヨウ ヒフク アーク ヨウセツ キンゾク ノ オウリョク フショク ワレ カンジュセイ ニ オヨボス カガク セイブン ネツ ショリ ノ エイキョウ

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The SCC (Stress Corrosion Cracking) susceptibilities of Inconel alloy 600 weld metals of various chemical compositions have been investigated for the specimens in the as-welded states and those subjected to the heat treatment consisting of stress relief annealing (SR) for 72 ks at 893 K and subsequent ageing (LTA) for 720 ks at 673 K. The weld metal specimens were cut from the shielded metal arc welds of C content=0. 03-0. 11mass%, Nb=1. 22-4. 39mass%, Cr=13. 81-21. 44mass%, and P=0. 011-0. 031mass%. The SCC susceptibility of the weld metals was evaluated from the maximum depth and number of cracks occurring on the CBB (Creviced Bent Beam) test in high temperature pressurized water. Their intergranular corrosion resistance was also evaluated based on the double-loop electrochemical potentiokinetic reactivation method. The SCC susceptibility of the weld metal showed a strong dependence on the intergranular corrosion resitance and the hardness;the weld metal became more susceptible to SCC, as the hardness was increased and the intergranular corrosion resistance was impaired. The increases in Cr and Nb contents improved the intergranular corrosion resistance, whereas the increases in C and P contents impaired it. The hardness increased with C and Nb contents, but it was almost independent of Cr content. In particular, the weld metals subjected to the SR+LTA treatment were hardened remarkably with the increase in Nb content owing to the precipitation of ?'phase (Ni3Nb) during the SR treatment in interdendritic areas enriched in Nb. The addition of P shrunk the interdendritic area hardened by the ?'precipitate, resulting in the decrease in hardness. Thus, the SCC susceptibility of the weld metal was improved as the C content was decreased and the Cr content was increased, while the effects of the increase in Nb content depended on the C content;i. e. , it improved the SCC susceptibilities of the weld metals of low C content but impaired those of high C contents. The increase in P content, though decreasing the intergranular corrosion resistance, improved the SCC susceptibility of the weld metals of high Nb contents after the SR+LTA treatment by reducing the hardness.

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  • 圧力技術

    圧力技術 48 (1), 26-39, 2010

    一般社団法人 日本高圧力技術協会

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