应用马架扩孔、马架扩孔＋环轧和完全环轧三种工艺制备TC4钛合金大型环件，分析不同制备工艺下合金的显微组织和力学性能。研究结果表明，不同制备工艺获得的TC4钛合金大型环件的显微组织几乎没有差别，无论哪种工艺制备的TC4钛合金环件都呈现等轴组织，且不同部位的显微组织一致均匀。综合考虑三种工艺获得的环件的室温和高温性能，推荐采用马架扩孔＋一火次环轧的制备工艺，通过该工艺获得的环件的室温和高温力学性能均可达到较好水平。%Three kinds of processing method of open forging , open forging+looping mill rolling and complete looping mill rolling were used for the preparation of TC 4 large-sized ring .The microstructures and mechanical properties of the rings produced by different processing methods were tested and analyzed .The results indicate that TC 4 titanium alloy rings show equiaxed microstructure and little difference after various processing methods .At the same time, the mi-crostructure of the rings in different zones also show uniformity , which indicate the processing method produce little effect on the microstructure of TC 4 titanium alloy rings . The mechanical properties results indicate the processing method of open forging+looping mill rolling shows more advantage in comparison with others processing methods .The room-temperature and high-temperature properties of TC4 titanium alloy rings after open forging +looping mill rolling are all preferable .
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