贾志伟,冯芝华,王红红,等.热处理次数对ZTA15合金组织与性能的影响[J].精密成形工程,2018,10(3):28-33.
JIA Zhi-wei,FENG Zhi-hua,WANG Hong-hong,et al.Effects of Multiple Heat Treatment Times on Microstructure and Mechanical Properties of ZTA15 Alloy[J].Journal of Netshape Forming Engineering,2018,10(3):28-33. |
| 热处理次数对ZTA15合金组织与性能的影响 |
| Effects of Multiple Heat Treatment Times on Microstructure and Mechanical Properties of ZTA15 Alloy |
| 投稿时间：2018-04-20 修订日期：2018-05-10 |
| DOI：10.3969/j.issn.1674-6457.2018.03.006 |
| 中文关键词: 钛合金 热处理 微观组织 力学性能 |
| 英文关键词: titanium alloy heat treatment microstructure mechanical property |
| 基金项目: |
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| 摘要点击次数: 4345 |
| 全文下载次数: 3407 |
| 中文摘要: |
| 目的 研究热处理反复矫形5次对ZTA15合金铸件组织与性能的影响。方法 通过熔模精密铸造方法制备ZTA15合金铸件和试样，进行1次热等静压处理后再进行5次920 ℃循环热处理，分析并对比了ZTA15合金在热等静压和热处理状态下的宏观组织和微观组织变化，以及对室温和高温400 ℃拉伸性能的影响。结果 随着热处理次数的增加，晶粒度趋向圆润；合金在α+β两相区循环热处理过程出现α条碎断、粗化的现象，典型的魏氏体组织向网篮状组织转变，组织更加稳定；室温拉伸性能较热等静压状态略有下降，而高温400 ℃性能与热等静压状态基本持平。结论 ZTA15合金经5次热处理后，室温拉伸性能稳定满足抗拉强度≥885 MPa，屈服强度≥785 MPa，伸长率≥5%，断裂收缩率≥12%，高温400 ℃拉伸性能稳定满足抗拉强度≥622 MPa，伸长率≥10%指标要求，可以为铸件热矫形提供数据支持。 |
| 英文摘要: |
| The paper aims to study effects of 5 times of multiple heat treatment on microstructures and mechanical properties of ZTA15 alloy. ZTA15 alloy castings and samples were prepared by investment casting method. Five times of cycling heat treatment were carried out after ZTA15 alloy samples were treated once by HIP. Microstructure evolution and properties of ZTA15 alloy under the conditions of HIP and heat treatment as well as influences of room temperature and high temperature of 400 ℃ were analyzed and compared. With the increase of heat treatment times, the grain became round. During the multiple heating in (α+β) region, the α plates were separated into small segments and became coarser. The microstructures changed from typical widmannstatten structure to basketweave structure and became more stable. The performance of room-temperature slightly decreased but the mechanical properties at 400 ℃ were almost equally with that in HIP state. Mechanical properties of ZTA15 alloy on room-temperature conform to the requirement of Rm≥885 MPa, RP0.2≥785 MPa, A≥5%, Z≥12%. Mechanical properties of ZTA15 alloy on 400 ℃ meet the requirement of Rm≥622 MPa, A≥10%. They can provide data support for thermal correction of casting. |
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