摘要
研究了硅基和铝基陶瓷型芯脱除工艺对DZ40M钴基高温合金的组织和性能的影响。结果表明,硅基陶瓷型芯脱芯处理24 h后,DZ40M合金的组织和性能没有显著变化;经铝基陶瓷型芯脱芯处理300 h后,DZ40M合金的组织变化不明显,但是力学性能显著下降。在合金试样外层厚度约1 mm的环形区发生脆化,是其在脱芯处理过程中被充氢而发生氢脆引起的。
Effect of the leaching process of Si O2- and Al2O3-based ceramic core on the microstructure and mechanical property of the investment cast Co-based superalloy DZ40 M is investigated. It is shown that after immersion in the leaching medium for Si O2-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 DZ40 M 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.
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2016年第2期140-148,共9页
Chinese Journal of Materials Research
关键词
金属材料
DZ40M合金
脱芯工艺
显微组织
力学性能
氢脆
metallic materials
DZ40M alloy
core leaching technology
microstructure
mechanical properties
hydrogen embrittlement
