超细晶纯钛疲劳裂纹的扩展行为

doi:10.11901/1005.3093.2019.492

材料研究学报

2020, Vol. 34

Issue (6): 417-424 DOI: 10.11901/1005.3093.2019.492

研究论文

本期目录 | 过刊浏览

超细晶纯钛疲劳裂纹的扩展行为

刘晓燕(

), 柳奎君, 杨西荣, 王敬忠, 罗雷

西安建筑科技大学冶金工程学院西安 710055

Fatigue Crack Propagation Behavior of Ultrafine Grained Pure Titanium

LIU Xiaoyan(

), LIU Kuijun, YANG Xirong, WANG Jingzhong, LUO Lei

School of Metallurgical Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China

引用本文:

刘晓燕, 柳奎君, 杨西荣, 王敬忠, 罗雷. 超细晶纯钛疲劳裂纹的扩展行为[J]. 材料研究学报, 2020, 34(6): 417-424.
Xiaoyan LIU, Kuijun LIU, Xirong YANG, Jingzhong WANG, Lei LUO. Fatigue Crack Propagation Behavior of Ultrafine Grained Pure Titanium[J]. Chinese Journal of Materials Research, 2020, 34(6): 417-424.

全文: PDF(2281 KB) HTML

摘要:

对纯钛进行2道次室温等径弯曲通道变形(ECAP)、等径弯曲通道变形加旋锻复合变形(ECAP+RS)并在旋锻后在300℃和400℃退火1 h，制备出4种具有不同组织的超细晶纯钛。对这4种超细晶纯钛进行疲劳裂纹扩展实验并观察分析超细晶纯钛的显微组织和疲劳断口的形貌，研究了裂纹的扩展行为。结果表明：显微组织对超细晶纯钛的疲劳裂纹扩展门槛值和近门槛区有显著的影响；超细晶纯钛的疲劳裂纹扩展门槛值随着塑性变形量的增大而增大，随着旋锻后退火温度的提高而降低；疲劳裂纹扩展速率曲线因超细晶纯钛晶粒尺寸和强度的影响出现转折，转折前ECAP+RS复合变形纯钛的抗疲劳裂纹扩展能力比ECAP变形强，且随着退火温度的提高而降低；转折后4种超细晶纯钛的疲劳裂纹扩展速率相差较小，呈现出相反的结果。疲劳裂纹扩展寿命中转折前近门槛区裂纹扩展寿命占绝大部分，因而转折前的门槛值与近门槛区的扩展速率对抗裂纹扩展能力更为重要。

关键词 ：金属材料, 超细晶纯钛, 疲劳裂纹扩展, 微观组织, 疲劳断口

Abstract：

Four kinds of ultrafine grained (UFG) pure titanium were obtained by two-pass equal channel angular pressing (ECAP) at room temperature, ECAP+rotary swaging (RS) and ECAP+RS followed by annealing at 300℃ and 400℃ for 1 h, respectively. The fatigue crack growth tests of different UFG pure titanium were carried out, while their microstructure, the fatigue fracture morphology and the crack growth behavior were investigated by TEM and SEM. Results show that the microstructure has a significant effect on the threshold of fatigue crack growth rate and the near threshold zone of UFG pure titanium. The threshold values of fatigue crack growth rate for UFG pure titanium increase with the increase of strain, and decrease with the increase of annealing temperature after RS. The turning point occurs in the fatigue crack growth rate curve, which is affected by grain size and strength of UFG pure titanium. Before the turning point, UFG pure titanium produced by ECAP+RS has stronger resistance to fatigue crack growth than that produced only by ECAP, and the resistance to fatigue crack growth of UFG pure titanium after ECAP+RS decreases with the increase of annealing temperature. After the turning point, the fatigue crack growth rates of four kinds of UFG pure titanium are slightly different and the opposite result is presented. The threshold value before the turning point and the growth rate of the near threshold zone may play much important role in enhancing the resistance to the crack growth because the growth life of the crack of the near threshold zone before the turning point accounts for a very large part of the fatigue crack growth life.

Key words： metallic materials UFG pure titanium fatigue crack growth microstructure fatigue fracture

收稿日期: 2019-10-23

ZTFLH:

TG146.2+3

基金资助:国家自然科学基金(51474170);教育厅专项项目(Z20190246)

作者简介: 刘晓燕，女，1980年生，博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.492 或 https://www.cjmr.org/CN/Y2020/V34/I6/417

表1 纯钛的化学成分

图1 单边缺口拉伸试样的尺寸

图2 超细晶纯钛的显微组织

表2 超细晶纯钛的力学性能

图3 超细晶纯钛的疲劳裂纹扩展速率

表3 超细晶纯钛的裂纹扩展参数值

图4 超细晶纯钛的宏观扩展路径和宏观断口

图5 不同状态超细晶纯钛的疲劳断口形貌

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