跨相区等温锻造对TC18合金组织和性能的影响  

Effect of Cross-region Forging on Microstructure and Mechanical Properties of TC18 Titanium Alloy

作　　者：刘瑞[1] 郭鸿镇[1] 张永强[1] 姚泽坤[1] 

机构地区：[1]西北工业大学材料学院,陕西西安710072

出　　处：《热加工工艺》2012年第9期26-28,共3页Hot Working Technology

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.

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 

分 类 号：TG312[金属学及工艺—金属压力加工]