摘要
研究了跨相区等温锻造时不同变形量分配对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;两相区较大变形时,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。
Effects 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 to deforming in β phase,which contain the visible grain boundary α.As the larger deformation degree in（α＋β） phase,the microstructure tends to be uneven,lamellar and equiaxial α exist at the same time,the forgings strength increase.Plasticity remains nearly unchanged and fracture toughness droppes.
出处
《热加工工艺》
CSCD
北大核心
2012年第9期26-28,共3页
Hot Working Technology
关键词
TC18钛合金
跨相区等温锻造
变形量
显微组织
力学性能
TC18 alloy
cross-region isothermal forging
deformation degree
microstructure
mechanical properties
