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

参考文献：

[1]魏寿庸, 王青江, 何瑜, 等. 航空发动机用BT25和BT25y热强钛合金评述[J]. 钛工业进展, 2013, 30(4): 9-14.

Wei S Y, Wang Q J, He Y, et al. Review of BT25 and BT25y titanium alloys for aero-engine[J]. Titanium Industry Progress, 2013, 30(4): 9-14.

[2]蔡钢, 雷旻, 万明攀, 等. 加热速度对BT25钛合金α→β相变的影响[J]. 稀有金属, 2016, 40(1): 8-13.

Cai G, Lei M, Wan M P, et al. α→β phase transformation in BT25 titanium alloy affected by heating rate[J]. Chinese Journal of Rare Metals, 2016, 40(1): 8-13.

[3]宁兴龙. 俄罗斯航空用钛合金[J]. 钛工业进展, 1999, 16(4): 19-25.

Ning X L. Russian aviation titanium alloy[J]. Titanium Industry Progress, 1999, 16(4):19-25.

[4]韩如旭. BT25y钛合金精锻棒材组织与性能的研究[J]. 钛工业进展, 2012, 29(2): 32-34.

Han R X. Study on relation of structure and performance of BT25y titanium alloy finish forged bar[J]. Titanium Industry Progress, 2012, 29(2): 32-34.

[5]郭鸿镇. 合金钢与有色合金锻造[M]. 西安: 西北工业大学出版社, 2009.

Guo H Z. Forging of Alloy Steel and Nonferrous Metals[M]. Xi′an: Northwestern Polytechnical University Press, 2009.

[6]彭小娜, 郭鸿镇, 石志峰, 等. 近等温变形量对TC4-DT钛合金组织参数和拉伸性能的影响[J]. 航空材料学报, 2013, 33(3): 18-24.

Peng X N, Guo H Z, Shi Z F, et al. Effects of near-isothermal deformation amounts on microstructure parameters and tensile properties of TC4-DT titanium alloy[J]. Journal of Aeronautical Materials, 2013, 33(3): 18-24.

[7]杨觉先. 金属塑性变形物理基础[M]. 北京: 冶金工业出版社, 1988.

Yang J X. The Physical Basis of Metal Plastic Deformation[M]. Beijing: Metallurgical Industry Press, 1988.

[8]Wang T, Guo H Z, Wang Y W, et al. The effect of microstructure on tensile properties, deformation mechanisms and fracture models of TG6 high temperature titanium alloy[J]. Materials Science and Engineering A, 2011, 528(6): 2370-2379.

[9]刘智恩. 材料科学基础[M]. 西安: 西北工业大学出版社, 2010.

Liu Z E. Foundation of Material Science[M]. Xi′an: Northwestern Polytechnical University Press, 2010.

[10]屈雅倩. BT25y钛合金等温锻造及热处理工艺研究[D]. 西安: 西北工业大学, 2015.

Qu Y Q. Study of Isothermal Forging and Heat Treatment Process of BT25y Titanium Alloy[D]. Xi′an: Northwestern Polytechnical University, 2015.

[11]路纲, 张翥, 惠松骁, 等. BT25y高温高强钛合金研究[J]. 金属学报, 2002, 38(Z): 206-209.

Lu G, Zhang Z, Hui S X, et al. Study on BT25y high temperature and high strength titanium alloy[J]. Acta Metallurgica Sinica,2002,38(Z): 206-209.

[12]王涛, 郭鸿镇, 赵严, 等. 等温变形量对600 ℃ TG6高温钛合金组织性能的影响[J]. 稀有金属材料与工程, 2010, 39(9): 1540-1544.

Wang T, Guo H Z, Zhao Y, et al. Effect of isothermaI deformation amount on microstructure and properties of 600 ℃ high temperature titanium alloy TG6[J]. Rare Metal Materials and Engineering, 2010, 39(9): 1540-1544.

[13]王涛, 郭鸿镇, 赵张龙, 等. TG6合金等温变形条件下组织演变与性能的研究[J]. 稀有金属材料与工程, 2010, 39(10): 1849-1852.

Wang T, Guo H Z, Zhao Z L, et al. Microstructure evolution and properties of TG6 alloy under the isothermal deformation condition[J]. Rare Metal Materials and Engineering, 2010, 39(10): 1849-1852.

[14]王涛, 郭鸿镇, 张永强, 等. 热锻温度对TG6高温钛合金显微组织和力学性能的影响[J]. 金属学报, 2010, 46(8): 913-920.

Wang T, Guo H Z, Zhang Y Q, et al. Effects of hot forging temperature on microstructure and mechanical property of TG6 high temperature titanium alloy[J]. Acta Metallurgica Sinica, 2010, 46(8): 913-920.

[15]彭小娜. 损伤容限型TC4-DT合金锻件组织性能控制研究[D]. 西安: 西北工业大学, 2014.

Peng X N. Study on the Control of Microstructure and Mechanical Properties of Damage Tolerance Titanium Alloy TC4-DT Forging[D]. Xi′an: Northwestern Polytechnical University, 2014.

[16]Lutjering G, Williams J C. Titanium[M]. New York: Berlin Heidelberg, 2007.

[17]Peng X N, Guo H Z, Shi Z F, et al. Microstructure characterization and mechanical properties of TC4-DT titanium alloy after thermomechanical treatment[J]. Transactions of Nonferrous Metals Society of China, 2014, 24(3): 682-689.

[18]党薇, 薛祥义, 李金山, 等. TC21合金片层组织特征对其断裂韧性的影响[J]. 中国有色金属学报, 2010, 20(S1): 16-20.

Dang W, Xue X Y, Li J S, et al. Influence of lamellar microstructure feature on fracture toughness of TC21 alloy[J]. The Chinese Journal of Nonferrous Metals, 2010, 20(S1): 16-20.

[19]Richards N L. Quantitative evaluation of fracture toughness-microstructural relationships in alpha-beta titanium alloy[J]. Journal of Materials Engineering and Performance, 2004,13(2): 218-225.

[20]Richards N L, Barnby J T. The relationship between fracture toughness and microstructure in alpha-beta titanium alloys[J]. Materials Science and Engineering, 1976, 26(2): 221-229.

[21]Ankem S, Margolin H, Greene C A, et al. Mechanical properties of alloys consisting of two ductile phases[J]. Progress in Materials Science, 2006, 51(5): 632-709.

[22]钟群鹏, 赵子华. 断口学[M]. 北京: 高等教育出版社, 2006.

Zhong Q P, Zhao Z H. Fractography[M]. Beijing: Higher Education Press, 2006.

服务与反馈：

【本网站尚未开通全文下载服务】【加入收藏】