摘要
为调节Ti−6Al−4V锻件显微组织和力学性能,进行一系列退火处理。结果表明:锻态和退火态组织均呈现由等轴初生α相(αp)和转变β相(βt)组成的双态组织。随着退火温度的升高,次生α相(αs)从β相中析出。组织中没有明显的织构,晶体取向均匀分布。同时,强度呈先增大后减小的变化趋势,而塑性没有明显的变化。在860℃退火处理时,由于析出的细小αs相含量较高,合金具有强度和塑性的良好匹配。所有断口表面均包含大量韧窝,为典型的韧性断裂特征。在断口附近发现微裂纹、微孔洞和扭结αp/αl相(等轴αp相和片层α相)特征。
A range of annealing treatments were implemented to regulate the microstructure and mechanical properties of Ti−6Al−4V forging.The results show that both the as-forged and as-annealed microstructures exhibit a bimodal structure composed of equiaxed primaryαphase(αp)and transformedβphase(βt).With the increase of annealing temperature,the secondaryα(αs)phase precipitates from theβphase.There is no obvious texture and the crystal orientation is uniformly distributed.Meanwhile,strength initially increases and then decreases,whereas ductility remains largely unaffected.The alloy annealed at 860℃ has an excellent combination of strength and ductility,due to the larger content of the fineαs phase.All fracture surfaces contain massive dimples,which is a typical ductile fracture feature.The characteristics of microcracks,microvoids,and kinkedαp/αl(equiaxedαp and lamellarαphase)phases are found near the fracture.
作者
刘石双
蔡建明
周毅
曹京霞
张旺峰
戴圣龙
黄旭
曹春晓
Shi-shuang LIU;Jian-ming CAI;Yi ZHOU;Jing-xia CAO;Wang-feng ZHANG;Sheng-long DAI;Xu HUANG;Chun-xiao CAO(Aviation Key Laboratory of Science and Technology on Advanced Titanium Alloys,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China)
基金
National Science and Technology Major Project,China (Nos.2017-VI-0004-0075,J2019-VI-0005-0119)
Independent Innovation Special Fund Project of AECC (No.CXPT-2019-030)
Stability Program for Basic Materials Research Institutes,China (Nos.2019-0C-4753,CXPT-2020-033)
Fundamental Strengthening Program of AECC (No.2021-JCJQ-JJ-0114)for financial support.
作者简介
Corresponding author:Yi ZHOU,Tel:+86-15210133707,E-mail:ChinaMonday@163.com;Xu HUANG,Tel:+86-13910936626,E-mail:13910936626@139.com。
