超音速微粒轰击对TC11钛合金组织和疲劳性能的影响

doi:10.11868/j.issn.1001-4381.2020.000435

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摘要

采用超音速微粒轰击(SFPB)技术对层片组织的TC11钛合金进行表面纳米化处理，对比研究了表面纳米化处理前、后TC11钛合金的室温高周疲劳行为；借助光学显微镜(OM)、扫描电镜(SEM)、透射电镜(TEM)和X射线衍射仪(XRD)对比分析了高周疲劳断口及断口附近的微观组织形貌。结果表明：经SFPB处理后在钛合金表层产生了30~50 μm厚的纳米层，纳米晶尺寸在5~15 nm左右；疲劳性能得到明显提高，在相同应力级别下的疲劳寿命提高了约8~10倍，疲劳条带宽度变窄，且随着加载级别的降低，疲劳寿命提高的倍数逐渐增加；SFPB前、后疲劳断口均由疲劳源区、裂纹扩展区、瞬断区三部分组成，但SFPB处理后的疲劳源由处理前的表层移至次表层；SFPB处理态试样疲劳加载后表层组织仍为纳米量级，但次表层组织中出现大量的形变孪晶、位错缠结以及少量的形变诱导马氏体组织。

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	武永丽
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	陈正阁
	查小琴
	岳赟
	刘玉亮
	张金民
	任凤章

关键词 ：超音速微粒轰击, TC11钛合金, 表面纳米化, 高周疲劳, 微观组织

Abstract：

The high cycle fatigue behavior of TC11 titanium alloy with lamellar structure before and after surface nanocrystallization was studied by supersonic fine particle bombardment (SFPB).The microstructure of the high cycle fatigue fracture and its vicinity were compared and analyzed by means of optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM) and X-ray diffraction (XRD).The results show that there are 30-50 μm thick nanolayers on the surface of titanium alloy after SFPB treatment, and the size of nanocrystalline is about 5-15 nm.The fatigue performance is improved obviously and the fatigue life is increased about 8-10 times under the same stress level, the fatigue striation width becomes narrow, and the multiple of fatigue life increases gradually with the decrease of loading level.The fatigue fracture surface before and after SFPB treatment consists of the fatigue source zone, the crack propagation zone and the instantaneous fracture zone, but the fatigue source after SFPB treatment moves from the surface layer before treatment to the subsurface.After fatigue loading, the surface microstructure of SFPB treated specimens is still in nanometer scale, but there are a lot of deformation twins, dislocation tangles and a small amount of deformation-induced martensite in the subsurface microstructure.

Key words： supersonic fine particle bombardment TC11 titanium alloy surface nanocrystallization high cycle fatigue microstructure

收稿日期: 2020-05-16 出版日期: 2021-05-21

中图分类号:

TG113.25⁺5

基金资助:国家自然科学基金资助项目(U1804146);国家自然科学基金资助项目(51801054);河南省高校科技创新人才支持计划项目(17HASTIT026);河南省外国专家与引智项目(HNGD2020009);河南科技大学科技创新团队资助项目(2015XTD006)

通讯作者: 熊毅 E-mail: xy_hbdy@163.com

作者简介: 熊毅(1975-), 男, 教授, 博士, 研究方向为先进结构材料制备及其表面改性, 联系地址: 河南省洛阳市洛龙区开元大道263号河南科技大学(开元校区)材料科学与工程学院, xy_hbdy@163.com

引用本文:

武永丽, 熊毅, 陈正阁, 查小琴, 岳赟, 刘玉亮, 张金民, 任凤章. 超音速微粒轰击对TC11钛合金组织和疲劳性能的影响[J]. 材料工程, 2021, 49(5): 137-143.
Yong-li WU, Yi XIONG, Zheng-ge CHEN, Xiao-qin ZHA, Yun YUE, Yu-liang LIU, Jin-min ZHANG, Feng-zhang REN. Effect of supersonic fine particle bombardment on microstructure and fatigue properties of TC11 titanium alloy. Journal of Materials Engineering, 2021, 49(5): 137-143.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2020.000435 或 http://jme.biam.ac.cn/CN/Y2021/V49/I5/137

Table 1 TC11钛合金的主要化学成分(质量分数/%)

Fig.1 TC11钛合金SFPB前、后的S-N曲线

Fig.2 SFPB前、后的SEM微观组织形貌
(a)双重退火后；(b)SFPB后

Fig.3 SFPB处理态试样疲劳加载前、后的TEM微观组织形貌
(a)疲劳加载前表层；(b)疲劳加载前次表层(100 μm处)(c)疲劳加载后表层；(d)~(f)疲劳加载后次表层(100 μm处)

Fig.4 双重退火态以及SFPB处理态疲劳加载前、后TC11钛合金的XRD图谱

Fig.5 SFPB前、后疲劳断口形貌(σ=500 MPa, N_前=147270 cycle, N_后=2025600 cycle)
(a)SFPB前整体形貌图；(b)SFPB后整体形貌图；(c)图(a)位置Ⅰ放大图；(d)图(b)位置Ⅰ放大图；(e)图(a)位置Ⅱ放大图；(f)图(b)位置Ⅱ放大图；(g)图(a)位置Ⅲ放大图；(h)图(b)位置Ⅲ放大图

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