热等静压温度对14Cr-ODS钢显微组织及力学性能的影响

The milling technology of oxides dispersion strengthened steels alloy powders were studied firstly by laser particle size analyzer, X-ray diffraction (XRD), scanning electron microscope (SEM), energy dispersive spectrometer (EDS) and so on. The electron backscattered diffraction, transmission electron microscope, high-angle annular dark field image, and small-angle X-ray scattering were applied to study the effect of hot isostatic pressing temperatures on the microstructure and mechanical properties of 14Cr-ODS steels. The experiment data show that the alloy powder can meet the requirements of preparing ODS steels after 50 h ball milling. The grain sizes of 14Cr-ODS steels hot isostatic pressing at 900℃ and 1 200℃ are 0.4 μm and 1.2 μm, respectively. Y-Ti-O-rich nanoclusters, Y₂Ti₂O₇ and large-sized Cr-Ti-O-rich phases are found in 14Cr-ODS steels hot isostatic pressing at 900℃ and 1 200℃. The distribution density of Y-Ti-O-rich nanoclusters in 14Cr-ODS steels hot isostatic pressing at 900℃ is 4.96×10²⁴ /m³. As the hot isostatic pressing temperature rising, the size of Y-Ti-O-rich nanoclusters growing while distribution density decreasing. The Vickers hardness of 14Cr-ODS steels HIP at 900℃ is slightly higher, and the tensile strength is higher at test temperatures.