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GH4710合金的相析出特征及其與熱加工塑性損傷的關聯性

Precipitation characteristics of GH4710 alloy and its relationship to plastic damage evolution during hot working process

  • 摘要: 利用Thermal Calc熱力學軟件、光學金相顯微鏡、掃描電鏡等手段分析了GH4710合金原始態和不同條件熱物理模擬變形后的析出相及加工損傷特征,系統研究了析出相特征與該合金熱加工塑性損傷及開裂的關聯性.結果表明:GH4710合金的原始組織主要由γ'、MC及M23C6碳化物、γ+γ共晶組織組成;熱加工時微孑洞等損傷在MC碳化物及γ+γ共晶組織處形核后沿晶界擴展,最終相互連接導致合金大面積破壞;γ'相優先在MC碳化物及共晶組織附近析出,并通過其共格應力場的作用增加了損傷形核和擴展阻力,使合金在較低溫度下的塑性損傷值明顯小于高溫條件下.

     

    Abstract: The characteristics of precipitates and plastic damage in GH4710 alloy, both under original and different hot-forming conditions, were studied based on thermomechanical calculation by the Thermal Calc software and microstructural analysis by optical microscopy and scanning electron microscopy. The relationship between the precipitation characteristic and plastic damage evolution during the hot-forming process was also discussed. It is found that the equilibrium phases of the alloy mainly consist of γ', MC and M23C6 carbides, and γ/γ' eutectic structure. The MC carbides and eutectic structure act as damage sources during the deforming process, leading to the nucleation and connection of micropores, and then the propagation of macrocracks through the grain boundaries. The γ' phase precipitates preferentially at the MC and eutectic structure region of as-solidified structure, which impedes the nucleation and expanding of micropores by the γ/γ' coherent stress distribution, resulting in a lower plastic damage at sub-solvus deformation temperatures and a higher plastic damage at super-solvus deformation temperatures.

     

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