论文部分内容阅读
利用Thermal Calc热力学软件、光学金相显微镜、扫描电镜等手段分析了GH4710合金原始态和不同条件热物理模拟变形后的析出相及加工损伤特征,系统研究了析出相特征与该合金热加工塑性损伤及开裂的关联性.结果表明:GH4710合金的原始组织主要由γ’、MC及M_(23)C_6碳化物、γ+γ共晶组织组成;热加工时微孑洞等损伤在MC碳化物及γ+γ共晶组织处形核后沿晶界扩展,最终相互连接导致合金大面积破坏;γ’相优先在MC碳化物及共晶组织附近析出,并通过其共格应力场的作用增加了损伤形核和扩展阻力,使合金在较低温度下的塑性损伤值明显小于高温条件下.
The thermal and physical properties of GH4710 alloy were analyzed by means of Thermal Calc software, optical microscope and scanning electron microscope (SEM). The characteristics of precipitated phase and the plasticity of hot-working And cracking.The results show that the primary structure of GH4710 alloy consists of γ ’, MC and M 23 C 6 carbides and γ + γ eutectic microstructure, γ + γ eutectic microstructure along the grain boundary nucleation after the expansion, the final interconnection led to large-scale destruction of the alloy; γ ’phase preferentially in the MC carbide and eutectic structure precipitation, and through its role in the coherent stress field increased Damage nucleation and extended resistance, so that the alloy at lower temperatures plastic damage values were significantly less than the high temperature conditions.