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首页> 外文期刊>Philosophical magazine: structure and properties of condensed matter >Damage mechanism of nickel-based creep-resistant alloys strengthened by the Laves phase at the grain boundary
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Damage mechanism of nickel-based creep-resistant alloys strengthened by the Laves phase at the grain boundary

机译：晶界疏浚型抗蠕变合金的损伤机理

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摘要

This study proposes a design guideline for polycrystal Nibased model alloys with high ductility and 100-MPa creep rupture strength beyond 800°C and 105 h. These alloys are strengthened by both the precipitation of fine γ' particles inside the grain and the Laves phase at the grain boundary. For investigating the damage mechanism, transformation from the non-equilibrium Laves phase to the σ phase at the grain boundary and formation of the equilibrium needlelike Laves phase inside the grain are promoted by increasing the Fe concentration. The rupture time of Fe-free alloys significantly increases because of the equilibrium Laves phase at the grain boundary owing to a suitable Mo equivalent. In particular, W addition can help achieve hightemperature creep strength. The precipitate-free zone (PFZ) is predominantly formed by prior migration at the grain boundary without precipitation. Creep rupture occurs at the precipitation/matrix interface in the PFZ. Therefore, transformation control from the Laves to the σ phase at the grain boundary suppresses creep degradation. Consequently, a Ni-based alloy with strength >100 MPa and rupture elongation >20% at 800°C and 105 h is fabricated using Larson-Miller parameter conversion, and the alloy design guideline's validity is confirmed.
机译：本研究提出了具有高延展性的多晶Nibased模型合金的设计指南，100-MPA蠕变破裂强度超过800°C和105小时。通过晶粒内部的细γ'颗粒的沉淀和晶粒边界的疏浚阶段，这些合金加强。为了调查损伤机制，通过增加Fe浓度来促进从非平衡型Laves相到晶粒边界的σ相的转化和形成谷粒内的均线的平衡。由于由于合适的Mo等价物，Fe离线合金的破裂时间显着增加。特别是，W添加可以有助于实现高温蠕变强度。不通过在晶界预先迁移的情况下沉淀地形成无沉淀区（PFZ）。在PFZ中的降水/矩阵界面处发生蠕变破裂。因此，从雷击到晶界处的Σ相的转化控制抑制了蠕变劣化。因此，使用Larson-Miller参数转换制造了800℃和105小时的强度> 100MPa和破裂伸长率的Ni基合金，确认了合金设计指南的有效性。

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