首页|退火温度对多向锻造Ti-6Al-4V合金显微组织演变和拉伸行为的影响

退火温度对多向锻造Ti-6Al-4V合金显微组织演变和拉伸行为的影响

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为调节Ti-6A1-4V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/α1相(等轴αp相和片层α相)特征.
Influence of annealing temperature on microstructural evolution and tensile behavior of Ti-6A1-4V alloy manufactured by multi-directional forging
A range of annealing treatments were implemented to regulate the microstructure and mechanical properties of Ti-6A1-4V forging.The results show that both the as-forged and as-annealed microstructures exhibit a bimodal structure composed of equiaxed primary α phase(αp)and transformed β phase(βt).With the increase of annealing temperature,the secondary α(αs)phase precipitates from the β phase.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 fine αs phase.All fracture surfaces contain massive dimples,which is a typical ductile fracture feature.The characteristics of microcracks,microvoids,and kinked αp/α1(equiaxed αp and lamellar α phase)phases are found near the fracture.

Ti-6A1-4V forgingannealing temperaturemicrostructural evolutionsecondary α phasetensile propertiesductile fracture

刘石双、蔡建明、周毅、曹京霞、张旺峰、戴圣龙、黄旭、曹春晓

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中国航发北京航空材料研究院先进钛合金重点实验室,北京 100095

Ti-6A1-4V锻件 退火温度 显微组织演变 次生α相 拉伸性能 韧性断裂

National Science and Technology Major Project,ChinaNational Science and Technology Major Project,ChinaIndependent Innovation Special Fund Project of AECCStability Program for Basic Materials Research Institutes,ChinaStability Program for Basic Materials Research Institutes,ChinaFundamental Strengthening Program of AECC

2017-Ⅵ-0004-0075J2019-Ⅵ-0005-0119CXPT-2019-0302019-0C-4753CXPT-2020-0332021-JCJQ-JJ-0114

2024

10.1016/S1003-6326(24)66512-X

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(6)
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