Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第26卷    第3期    总第204期    2016年3月

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文章编号:1004-0609(2016)-03-0560-08
直接轧制变形量对Ti-B20-0.1B合金组织和性能的影响
黄立国,付大军,庄伟彬,高志玉

(辽宁工程技术大学材料科学与工程学院,阜新 123000)

摘 要: 研究直接轧制变形工艺对Ti-B20-0.1B合金组织和性能的影响。结果表明:加入少量硼可显著细化钛合金晶粒尺寸,提高合金的成形能力;Ti-B20-0.1B合金可不经过开坯锻造过程进行直接轧制,直接轧制使铸态组织中分布在晶界的TiB主要沿着轧制方向定向排列,定向排列的TiB晶须通过应力承载机制提高合金的拉伸强度。随着直接轧制变形量的增加,Ti-B20-0.1B合金中初生α相发生显著再结晶;经过两相区固溶及550 ℃时效处理后,直接轧制合金的力学性能显著提高。当压下率达到80%时,时效态Ti-B20-0.1B合金的抗拉强度达到1497.5 MPa,而伸长率为6.4%。

 

关键字: 钛合金;直接轧制;晶粒细化;拉伸性能

Influence of direct rolling process on microstructure andproperties of Ti-B20-0.1B alloy
HUANGLi-guo, FU Da-jun, ZHUANG Wei-bin, GAO Zhi-yu

College of Materials Science and Engineering, Liaoning Technical University, Fuxin 123000, China

Abstract:The effect of direct rolling process on microstructure and properties of Ti-B20-0.1B alloy was studied. The result shows that the addition of trace boron significantly refines the grain size of titanium alloy and improves the formability of titanium alloy. Direct rolling can be conducted on Ti-B20-0.1B alloy without the cogging process. Direct rolling makes TiB at the grain boundary in the as-cast microstructure align along the rolling direction. The tensile strength is improved by the aligned TiB whiskers through the load-sharing mechanism. The recrystallzation of primary α in Ti-B20-0.1B alloy occurs with the increase of deformation amount. After being solution-treated in two phases zone and aged at 550 ℃, the mechanical properties of the direct rolling alloy are significantly improved. When the reduction ratio is 80%, the tensile strength of the aged Ti-B20-0.1B alloy is 1497.5 MPa, and the elongation is 6.4%.

 

Key words: titanium alloy; direct rolling; grain refining; tensile property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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