都市ごみ焼却炉における耐熱鋳鋼SCH2製火格子の粒界腐食挙動と機構(FR3 バイオマス・自然エネルギー・廃棄物利用2)

概要

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High temperature corrosion behavior and mechanism of a grate bar made of SGH2 heat resistant cast steel in a municipal waste incinerator was investigated by scanning electron microscopy and electron probe micro-analysis. A network of intergranular corrosion beneath the outer scale was identified in the grate bar that was used during 16000 hours in the waste incinerator. In the laboratory test, intergranular corrosion was not identified on the as-received sample, however, it was identified on the sample that was heat treated using similar heat treatment conditions as those of the waste incinerator. It is concluded that intergranular corrosion on SCH2 was caused by selective corrosion of Cr-Fe carbide that have developed on grain boundary by repeated thermal cycle in the waste incinerator.
社団法人日本機械学会の論文
2004-06-22