Effect of Leaching Process for Ceramic Core on Microstructure and Mechanical Property of Investment Cast Co-base Superalloy DZ40M

Subjects: Materials Science >> Materials Science (General) submitted time 2023-03-31 Cooperative journals: 《材料研究学报》

佟健 陈甲祺 郑志 于永泗 宁礼奎 刘恩泽

Abstract： Effect of the leaching process of SiO2- and Al2O3-based ceramic core on the microstructure and mechanical property of the investment cast Co-based superalloy DZ40M is investigated. It is shown that after immersion in the leaching medium for SiO2-based ceramic core for 24 h, the microstructure and mechanical property of the alloy does not vary evidently; although after immersion in the leaching medium for Al2O3-based ceramic core for above 300 h, the microstructure variation of DZ40M alloy is not evident, but its mechanical property decreased remarkably, which may be due to the occurrence of an embrittled layer of about 1 mm in thickness on the alloy surface. The embrittled layer is caused by hydrogen embrittlement resulted from charging hydrogen during immersion in the leaching medium for Al2O3-based ceramic core.

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