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ECAP+旋锻变形制备超细晶纯锆的高周疲劳行为
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西安建筑科技大学冶金工程学院

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中图分类号:

TG146.4+14

基金项目:

国家自然科学基金(51474170)、陕西省教育厅专项科研计划项目(14JK1391)和陕西省教育厅重点实验室科研计划项目(15JS058)联合资助


Fatigue properties of the Ultrafine-grained Commercially Pure Zr
Author:
Affiliation:

School of Metallurgical Engineering,Xi’an University of Architecture and Technology,Xi’an

Fund Project:

The National Natural Science Foundation of China (51474170), Shaanxi Provincial Department of Education special research project (14JK1391) and Shaanxi Provincial Key Laboratory of Education Research Project (15JS058) jointly funded

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    摘要:

    室温采用等通道变形和旋锻复合工艺制备超细晶工业纯锆。对比研究了超细晶和粗晶工业纯锆拉伸和疲劳性能,并运用SEM对疲劳断口形貌进行观察和分析。结果表明:超细晶工业纯锆的室温抗拉强度明显大于粗晶工业纯锆,延伸率有一定程度地降低。超细晶工业纯锆疲劳性能优于粗晶工业纯锆,其应力幅(σa)与疲劳寿命(Nf)满足σa=750Nf-0.06,疲劳极限σ-1为285 MPa,较粗晶工业纯锆提高了70%。断口分析显示,疲劳裂纹萌生于超细晶工业纯锆的表面,疲劳裂纹扩展区辉纹间距较粗晶工业纯锆细小,疲劳裂纹扩展更为缓慢。

    Abstract:

    Ultrafine-grained commercially pure Zr (UFG Zr) was fabricated by equal channel angular pressing (ECAP) coupled with subsequent rotary swaging (RS). Tensile properties and fatigue performance of the commercially pure Zr with ultrafine-grained microstructure were investigated, and these results were compared with those of the commercially pure Zr with coarse-grained counterpart. Fracture surfaces were examined to study the fatigue fracture failure mechanism using SEM. The result shows that ultimate tensile strength of UFG Zr is obviously higher than that of the coarse-grained Zr (CG Zr) at room temperature, while the CG Zr exhibits a higher fracture elongation. Fatigue life of UFG Zr is significant higher than that of CG Zr. The relationship between the applied stress (σa) and cycles to failure (Nf) was determined as: σa=750 Nf -0.06. The conditional fatigue limit of UFG Zr is about 285 MPa, which is improved by 70% compared with that of CG Zr. The fractography analysis reveals that fatigue cracks mainly initiate from the surface of the UFG Zr specimen. The spacing of the fatigue striations of UFG Zr is smaller than that of CG Zr, which indicates that the crack propagation rate of UFG Zr is lower than that of CG Zr.

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杨西荣,柳峰. ECAP+旋锻变形制备超细晶纯锆的高周疲劳行为[J].稀有金属材料与工程,2019,48(8):2609~2615.[Yang Xirong, Liu Feng. Fatigue properties of the Ultrafine-grained Commercially Pure Zr[J]. Rare Metal Materials and Engineering,2019,48(8):2609~2615.]
DOI:10.12442/j. issn.1002-185X.20180137

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  • 收稿日期:2018-02-05
  • 最后修改日期:2018-03-22
  • 录用日期:2018-04-26
  • 在线发布日期: 2019-09-05
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