跨相区等温锻造对TC18合金显微组织和力学性能的影响
The effect of cross-region forging on the microstructure and mechanical properties of TC18 titanium alloy
刘瑞，郭鸿镇，张永强，姚泽坤
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作者单位：西北工业大学材料学院
中文关键字：TC18钛合金：跨相区等温锻造；变形量；显微组织；力学性能
英文关键字：TC18 alloy; cross-region isothermal forging; deformation degree ; microstructure ; mechanical properties
中文摘要：研究了跨相区等温锻造时，不同的变形量分配对TC18钛合金显微组织和力学性能的影响，讨论了跨相区锻造时组织和性能之间的关系。结果表明：跨相区等温锻造锻件的显微组织与两相区的变形量密切相关。两相区较小变形时，显微组织和单相区接近，晶界α明显，锻件力学性能和全β锻造没有太大差别；两相区大变形时，锻件的显微组织趋于不均匀，片状α相和球状α相同时存在，锻件强度升高，塑性基本保持不变，断裂韧性较两相区较小变形时明显下降。
英文摘要：The effect of different deformation degree in （α+β）region on the microstructure and mechanical properties of TC18 titanium alloy during the cross-region isothermal forging were studied. Experimental results show that the microstructure of TC18 titanium alloy is sensitive to the variation of deformation degree in（α+β）phase. Compared with deforming in β phase， the microstructure and mechanical properties of smaller deformation degree in（α+β）phase is close with deforming in β phase，which contain the visible grain boundary α. As the larger deformation degree in（α+β）phase, the microstructure tends to uneven, lamellar and equiaxial α exist at the same time, the forgings strength increased, plasticity remain nearly unchanged and fracture toughness dropped.