全部 标题 作者
关键词 摘要

OALib Journal期刊
ISSN: 2333-9721
费用:99美元

查看量下载量

相关文章

更多...
材料工程  2013 

大变形量近等温锻造开坯对TiAl合金组织与性能的影响

DOI: 10.3969/j.issn.1001-4381.2013.06.008, PP. 40-44

Keywords: TiAl合金,大变形量,近等温锻造,组织性能

Full-Text   Cite this paper   Add to My Lib

Abstract:

采用近等温锻造开坯工艺实验定量研究了增大变形量对Ti-46.5Al-2.5V-1.0Cr-0.3Ni合金变形组织均匀性和力学性能稳定性的作用。通过锻坯组织观察分析及硬度、强度分布测试,揭示了TiAl合金近等温锻造过程中变形量与宏观组织和微观组织均匀性的基本关系。结果表明近等温锻造变形量为65%,70%,75%,80%,85%时,随着变形量的增大,TiAl合金锻坯内的宏观变形流线分布趋于均匀,均匀变形区域面积不断增大,变形量85%时均匀变形区面积增加至68.0%,微观变形组织由等轴的γ和α2,以及很少量的残余层片团组成,晶粒尺寸明显细化,且等轴组织在合金中占到了绝大部分;锻坯硬度分布测试表明随着近等温锻造变形量的增大,均匀变形区域的硬度变化基本趋于均匀一致,且硬度平均值也在不断增高;锻坯难变形区和均匀变形区经1250℃/15h/AC热处理后取样进行室温压缩测试,随着近等温锻造变形量的增加锻坯各部位室温压缩应力应变数据分散度降低,性能稳定性提高。

References

[1]  YAMAGUCHI M, INUI H, ITO K. High-temperature structural intermetallics[J].Acta Metall Mater,2000,48(1):307-322.
[2]  SEMIATIN S L, SEETHARAMAN V, JAIN V K. Microstructure development during conventional and isothermal hot forging of a near-gamma titanium aluminide[J]. Metall & Mater Trans A,1994, 25A(12): 2753-2768.
[3]  FUJIWARA T, NAKAMURA A, HOSOMI M, et al. Deformation of polysynthetically twinned crystals of TiAl with a nearly-stoichiometric composition[J]. Philosophical Magazine A, 1990, 61(4): 591-606.
[4]  SEETHARAMAN V, SEMIATIN S L. Plastic-flow and microstructure evolution during hot deformation of a gamma titanium aluminide alloy[J]. Metall & Mater Trans A, 1997, 28A (11): 2309-2321.
[5]  司家勇,高帆,张继. 变形方向对TiAl合金二次热变形行为的影响[J]. 材料工程, 2010,(12): 51-54.SI Jia-yong,GAO Fan,ZHANG Ji.Effect of direction on flow behavior of TiAl alloy in secondary hot deformation[J].Journal of Materials Engineering,2010,(12):51-54.
[6]  汪大年. 金属塑形成形原理[M]. 北京:机械工业出版社,1982.
[7]  KIM Y W. Strength and ductility in TiAl alloys [J]. Intermetallics,1998, 6(7): 623-628.
[8]  SEMIATIN S L, SEETHARAMAN V, WEISS I. Hot working of titanium alloys-an overview. WEISS I E, SRINIVASAN R,BANIA P J,et al.Advances in the Science and Technology of Titanium Alloy Processing.Warrendale:TMS,1997.3-73.
[9]  SEMIATIN S L. Wrought processing of ingot-metallurgy gamma titanium aluminide alloys. Gamma Titanium Aluminides. Warrendale: TMS, 1995. 509-524.
[10]  张永刚,韩雅芳,陈国良,等. 金属间化合物结构材料[M]. 北京:国防工业出版社,2003.
[11]  SI Jia-yong, HAN Peng-biao, ZHANG Ji. The design for the isothermal forging of Ti-46.5Al-2.5V-1.0Cr-0.3Ni alloy[J]. Journal of Iron and Steel Research International, 2010, 17(8): 67-73.
[12]  SEMIATIN S L, CHESNUTT J C, AUSTIN C, et al. Processing of intermetallic alloys. Structural Intermetallics. Warrendale: TMS, 1997. 263-276.

Full-Text

Contact Us

service@oalib.com

QQ:3279437679

WhatsApp +8615387084133