CAJ | 학술논문

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 M23 C6碳化物、γ+γ'共晶组织组成；热加工时微孔洞等损伤在 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。
이용 Thermal Calc 열역학연건、광학금상현미경、소묘전경등수단분석료 GH4710합금원시태화불동조건열물리모의변형후적석출상급가공손상특정，계통연구료석출상특정여해합금열가공소성손상급개렬적관련성。결과표명：GH4710합금적원시조직주요유γ'、MC 급 M23 C6탄화물、γ+γ'공정조직조성；열가공시미공동등손상재 MC 탄화물급γ+γ'공정조직처형핵후연정계확전，최종상호련접도치합금대면적파배；γ′상우선재 MC 탄화물급공정조직부근석출，병통과기공격응력장적작용증가료손상형핵화확전조력，사합금재교저온도하적소성손상치명현소우고온조건하。
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 M23 C6 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 tem-peratures and a higher plastic damage at super-solvus deformation temperatures.