锻压技术

等温锻造变形程度对BT25y钛合金组织和性能的影响

英文标题：Influence of isothermal forging deformation degree on microstructure and mechanical property of titanium alloy BT25y

作者：袁士翀杨雪梅郭鸿镇

单位：中国第二重型机械集团德阳万航模锻有限责任公司西北工业大学

关键词：BT25y钛合金等温锻造变形程度断裂显微组织力学性能

分类号：TG319

出版年,卷(期):页码：2017,42(1):131-137

摘要：

为了确定BT25y钛合金的最佳等温锻造工艺参数，研究了20%，40%和60%这3种变形程度对其组织和性能的影响。结果表明：随着变形程度的提高，原始的β大晶粒逐渐被压扁，β晶界发生一定程度的破碎，晶内片状α相宽度加大，组织变得更加均匀；同时，合金强度呈先减小后增大的趋势，伸长率和断面收缩率变化规律相同，都呈递增趋势，断裂韧性基本上也是随变形量的增加而提高，室温拉伸断裂方式由穿晶解理断裂转变为准解理断裂，在较大变形量时又演变成韧性断裂。实验结果表明在本实验条件下，等温锻造变形量为60%时可以获得较好的组织性能匹配。

In order to confirm the optimum isothermal forging parameters for BT25y titanium alloy, the influences of deformation degree such as 20%，40%，60% on the microstructure and mechanical properties were studied. Results show that with the increase of deformation degree, the original big β grain is gradually squashed, the β grain boundary is broken at a certain degree, the width of intracrystalline lamellar α increases, and the whole microstructure becomes more uniform. At the same time, the tensile strength shows a trend of increase after a first decline, the elongation and reduction of area show a trend of rise, and the fracture toughness basically maintains the upward trend. The room-temperature tensile fracture mode is changed from transgranular cleavage fracture to quasi-cleavage fracture, and finally it is transformed into mainly ductile fracture when the large deformation occurs. Under the above experimental conditions, the corresponding microstructures and properties of forgings can achieve a good match at the deformation degree of 60%.

基金项目：

国家自然科学基金资助项目（51205319）

袁士翀（1982-），男，硕士，工程师 E-mail：yuanshichong@126.com 通讯作者：杨雪梅（1989-），女，博士研究生 E-mail：yangxuemei@mail.nwpu.edu.cn

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