【摘要】 通过数值模拟研究了HIP温度（800～950℃）和压力（20～160 MPa）对钛合金铸件内部孔洞闭合的影响，并分析影响孔洞闭合的关键工艺参数。此外，以920℃/140 MPa热等静压工艺条件为例，分析热等静压不同阶段孔洞闭合情况。结果表明，当热等静压工艺参数T≥890℃且P≥80 MPa时，孔洞完全闭合，且在该区间内，压力参数对孔洞闭合的调控效果优于温度；孔洞体积在HIP升温升压阶段（第Ⅰ阶段）剧烈收缩，该阶段是孔洞闭合的主导阶段。更多还原

【Abstract】 The effects of HIP temperature(800-950℃) and pressure(20-160 MPa) on internal pore closure in a titanium alloy casting were investigated via numerical simulation. Key process parameters influencing pore closure were systematically analyzed. Taking the HIP condition of 920℃/140 MPa as an example, the pore closure behavior was further examined across different HIP stages. The results indicated that complete pore closure was achieved when T≥890℃ and P≥80 MPa. Within this parameter range, HIP pressure exhibited a more pronounced regulatory effect on pore closure compared to HIP temperature. Additionally, the pore volume underwent drastic contraction during the heating and pressurization stage(Stage Ⅰ), which was identified as the dominant phase for pore closure.更多还原