镍基铸造高温合金的热等静压改性研究

Modification of cast nickel-base superalloy by hot isostatic pressing

研究了热等静压处理对镍基铸造高温合金内部缺陷及显微组织的影响。结果表明,铸态镍基高温合金中存在大量疏松、孔洞等缺陷,合金由γ相及γ'相两相共存,γ'相的数量较多但分布不均匀,并有少量已发生团聚。1040℃×2 h热等静压处理可明显减少合金中疏松和孔洞等显微缺陷,增加强化相数量,但γ'相有少量聚集长大。1200℃×2 h下热等静压处理基本消除了合金中的疏松组织,但仍存在少量的微孔,原始的γ'相溶化并重新析出了细小的二次γ'相。

Effect of hot isostatic pressing （HIP） treatment on microstructure of cast nickel-base superalloy was investigated. The results show that the mierostructure of cast nickel-base superalloy is consisted ofγ phase and γ＇ phase which are unevenly distributed. There are a lot of defects such as gas porosity in cast nickel-base superalloy. After HIP treatment at 1040 ℃ for 2 h, defects in the alloy significantly reduce and amount of γ＇ phase increase, but some γ＇ phase grow up. After HIP treatment at 1200 ℃ for 2 h, defects in the alloy almost disappeare, the originalγ＇ phase melte and reprecipitate, but there are still a small amount of micropores.