在4组工艺参数（1 100℃/100 MPa/1 h，1 175℃/160 MPa/1 h，1 175℃/160 MPa/2 h，1 175℃/100 MPa/2 h）下对选区激光熔化（SLM）成形Hastelloy X合金试样进行热等静压（HIP）处理，并在815℃、105 MPa条件下进行了持久试验，研究了HIP工艺对试样显微组织和持久性能的影响。结果表明：HIP处理前试样的显微组织由细小柱状晶和树枝晶组成，经HIP处理后，晶粒长大，晶界上析出碳化物；在1 175℃下HIP处理后，试样的断后伸长率和断面收缩率均显著高于HIP处理前和在1 100℃下HIP处理后的，且显微组织和持久性能的各向异性减小；较长的HIP时间或较低的HIP压力会缩短试样的断裂时间，降低其断后伸长率和断面收缩率；当HIP工艺参数为1 175℃/160 MPa/1 h时，试样的持久性能相对较好，裂纹的消除效果也较好。

Selective laser melting (SLM) formed Hastelloy X alloy samples were treated by hot isostatic pressing (HIP) with parameters of 1 100℃/100 MPa/1 h, 1 175℃/160 MPa/1 h, 1 175℃/160 MPa/2 h and 1 175℃/100 MPa/2 h, respectively, and then subjected to stress-rupture tests at 815℃ under 105 MPa. The effects of HIP process on microstructure and stress-rupture property were studied. The results show that before HIP treatment, the microstructure of the sample was composed of fine columnar crystal and dendrite. After HIP treatment, the grains became larger and carbides precipitated at grain boundaries. After HIP treatment at 1 175℃, the elongation and reduction of area of the sample were higher than those before HIP treatment and after HIP treatment at 1 100℃, and the anisotropy of the microstructure and stress-rupture property decreased. The relatively long HIP time or relatively low HIP pressure decreased the rupture time, elongation and reduction of area of the sample. When the HIP process parameters were 1 175℃/160 MPa/1 h, the stress-rupture property of the sample was relatively good, and the eliminating of cracks was relatively effective.