Aging Hardening of Cu-Nb-Ni-Cr-Mo Steels
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摘要: 測定了不同Cu含量的Cu-Nb-Ni-Cr-Mo鋼在450~650℃時效時的硬度變化曲線,并結合光學金相與電鏡觀察分析了時效過程中的組織變化與脫溶沉淀行為.實驗結果表明:時效硬化是ε-Cu析出強化,Nb的碳氮化物以及含Cr的碳化物強化綜合作用的結果:相同時效溫度下,含Cr碳化物的時效峰在時效后期出現;在低鋼鋼中,時效前期出現的ε-Cu時效峰與Nb的碳氫化物時效峰重疊;在高鋼鋼中,由于銅含量升高,ε-Cu時效峰出現時間縮短,ε-Cu時效峰與Nb的碳氨化物時效峰逐漸分離.Abstract: The hardness versus time curves during aging at 450-650℃ of Cu-Nb steels with various copper content have been measured. The precipitation of ε-Cu, Nb carbonitfide and Cr carbide found during aging contributes to the hardening. The result indicates that the Cr carbide hardness peak emerges after long time aging. The more is the copper content the earlier the hardness peak of ε-Cu occurs. In high copper steel the hardness peaks of ε-Cu and Nb carbonitride separates and in low copper steel they overlaps.
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Key words:
- Cu-Nb steel /
- aging process /
- ε-Cu precipitation
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