研究新型阻燃钛合金Ti14(α+Ti_2Cu)经不同变形量(45%～75%)半固态锻造后的热稳定性能,分析变形量对合金热稳定性能的影响.结果表明:变形量改变析出相的形态及晶粒尺寸,使合金具有不同的热稳定性能.随变形量的增加,Ti14合金热暴露后的强度呈先降低后升高的趋势,塑性有所改善.半固态变形量较小时(45%),合金晶粒粗大,Ti_2Cu相呈长条状分布于晶界,高的强度取决于析出相强化作用:随变形量增大(75%),晶粒细化,Ti_2Cu相呈颗粒状或短棒状弥散分布,产生细晶强化,使得强度和塑性都得到改善.断口分析表明:变形量较小,断口存在大量撕裂棱;变形量达到75%,断口以韧窝为主;表明析出相和晶粒尺寸共同决定Ti14合金的热稳定性能.
The thermal stability of Ti14, a novel α+Ti_2Cu burn resistant titanium alloy, after semi-solid forging (SSF) with different deformation amount from 45% to 75% was investigated. Effects of deformation amount on the thermal stability were analyzed. The results show that the deformation amount significantly affects the morphology of precipitates and grain size, leading to change of thermal stability. With the deformation amount increasing, the strength of Ti14 alloy after thermal exposure decreases first and then increases, and the plasticity was improved. When the deformation amount was 45%, the microstructure consisted of coarse grains and strip-like Ti_2Cu precipitates in the grain boundary. As deformation amount increases to 75%, the microstructure changed to refined grains and granular or/and short rod-like Ti_2Cu, inducing the improvement of strength and plasticity. Fracture analyses show that the fracture has lots of tearing ridges for small deformation amount; when the deformation amount reaches 75%, the fracture are mainly dimples. It indicates the precipitates and grain size determine the thermal stability of Ti14 alloy together.
参考文献
| [1] | 谢水生;黄声宏.半固态金属加工技术及其应用[M].北京:冶金工业出版社,1999:2. |
| [2] | Iwasaki H;Mori K T;abuchi M M et al.[J].Acta Materialia,1998,46(18):6531. |
| [3] | Chino Y;Kobata M;Iwasaki H .[J].Acta Materialia,2003,51:3309. |
| [4] | Mohamed Ramadan;Mitsuharu Takita;Hiroyuki Nomura;Nader El-Bagoury .Semi-solid processing of ultrahigh-carbon steel castings[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1/2):285-291. |
| [5] | Zhu K Y;Zhao Y Q et al.[J].Journal of Materials Science,2000,35:5609. |
| [6] | 赵永庆;朱康英项;赵香苗 et al.[P].Chinese Defence Patent,97112302.0,1997. |
| [7] | Zhao Y Q;Wu W L;Ma X D .[J].Materials Science and Engineering A:Structural Materials Properties Microstructure and Processing,2004,373:315. |
| [8] | 陈永楠,魏建锋,赵永庆.不同半固态加工变形量的Ti14合金的微观组织和晶界特征[J].稀有金属材料与工程,2008(05):762-765. |
| [9] | 陈永楠,魏建锋,赵永庆.半固态加工变形温度对Ti14微观组织及变形机制的影响[J].稀有金属材料与工程,2008(03):433-435. |
| [10] | Zhao YQ;Wu WL;Chang H .Research on microstructure and mechanical properties of a new alpha+Ti2Cu alloy after semi-solid deformation[J].Materials Science & Engineering, A. Structural Materials: Properties, Misrostructure and Processing,2006(1-2):181-186. |
| [11] | 屈可朋,陈永楠,魏建锋,赵永庆,王慧.Ti14合金半固态变形后热稳定性的研究[J].稀有金属材料与工程,2009(07):1301-1303. |
| [12] | 郭萍,赵永庆,吴玮璐.变形工艺参数对半固态Ti14合金显微组织的影响[J].材料热处理学报,2008(01):54-57. |
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