钛合金的超高周疲劳滑移-解理竞争失效机制

doi:10.11901/1005.3093.2023.267

材料研究学报

2024, Vol. 38

Issue (7): 537-548 DOI: 10.11901/1005.3093.2023.267

研究论文

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钛合金的超高周疲劳滑移-解理竞争失效机制

杨溥¹, 邓海龙¹^,²(

), 康贺铭¹, 刘杰¹, 孔建行¹, 孙宇凡¹, 于欢¹, 陈雨¹

^1.内蒙古工业大学机械工程学院呼和浩特 010051
^2.内蒙古工业大学内蒙古自治区先进制造技术重点实验室呼和浩特 010051

Evaluation of Slip-cleavage Competition Failure Mechanisms for Titanium Alloys Induced by Microstructure in Very-high-cycle Fatigue Regime

YANG Pu¹, DENG Hailong¹^,²(

), KANG Heming¹, LIU Jie¹, KONG Jianhang¹, SUN Yufan¹, YU Huan¹, CHEN Yu¹

^1.School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, China
^2.Key Laboratory of Inner Mongolia for Advanced Manufacturing Technology, Inner Mongolia University of Technology, Hohhot 010051, China

引用本文:

杨溥, 邓海龙, 康贺铭, 刘杰, 孔建行, 孙宇凡, 于欢, 陈雨. 钛合金的超高周疲劳滑移-解理竞争失效机制[J]. 材料研究学报, 2024, 38(7): 537-548.
Pu YANG, Hailong DENG, Heming KANG, Jie LIU, Jianhang KONG, Yufan SUN, Huan YU, Yu CHEN. Evaluation of Slip-cleavage Competition Failure Mechanisms for Titanium Alloys Induced by Microstructure in Very-high-cycle Fatigue Regime[J]. Chinese Journal of Materials Research, 2024, 38(7): 537-548.

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摘要:

对TC4钛合金进行应力比为-1、-0.3和0.1的室温超高周疲劳实验，研究了微结构导致的超高周疲劳滑移-解理竞争失效机制。结果表明，这种合金的S-N曲线均呈双线性，表现出表面滑移失效、表面解理失效和内部解理失效三种失效模式。采用GP极值分布函数明确了表面缺陷尺寸的分布特性，并将其定义为试样表面区域厚度。计及试样的控制体积、外载荷大小、α晶粒含量以及α晶粒尺寸等微结构的耦合影响，将σ_max值的增大或减小作为TC4钛合金疲劳失效模式转变的主要因素构建了竞争失效模型。结果表明，所建模型的预测结果与实验数据有较好的相关性。用控制变量法研究了W值、α晶粒尺寸和α晶粒含量对TC4钛合金滑移-解理竞争失效机制的影响，发现W的取值并不影响表面滑移失效概率，α晶粒的增大或α晶粒含量的降低均有利于TC4钛合金的表面滑移失效；较大的W值、较大的α晶粒尺寸以及较少的α晶粒含量均有利于TC4钛合金的表面解理失效；较小的W值、较大的α晶粒尺寸以及较少的α晶粒含量均有利于TC4钛合金的内部解理失效。

关键词 ：金属材料, 超高周疲劳, 失效机理, TC4钛合金, 滑移-解理, 竞争失效

Abstract：

In order to comprehensively evaluate the influence of alloy structure on the competition mechanism of slip-cleavage failures during ultra-high cycle fatigue process of Ti-alloy, a competition failure model considering the maximum stress (σ_max) was constructed, and then the competition mechanism among failure modes was quantitatively described. Furthermore, the influence of microstructure (surface defects, $α$ -grain size and α-grain content) on the competition mechanism was revealed in detail by means of the control variable method. Meanwhile, ultra-high cycle fatigue tests of TC4 Ti-alloy under stress ratios of -1, -0.3 and 0.1 were carried out at room temperature. The S-N curves obtained under three stress ratios were bilinear, and TC4 Ti-alloy showed three failure modes, namely surface slip failure, surface cleavage failure and internal cleavage failure. The GP extreme value distribution function is used to clarify the distribution characteristics of the surface defect size, and the predicted extreme size of the surface defect is 5.69 μm, which is defined as the thickness of the sample surface area. Next, the coupling effect of microstructure variables such as control volume, external load, α-grain content and α-grain size, the increase or decrease of σ_max value is taken as the main factor of fatigue failure mode transformation of TC4 Ti-alloy and the competitive failure model is constructed. The calculation results show that the model prediction results have a good correlation with the experimental data. Finally, the effect of W value, α-grain size and α-grain content on the slip-cleavage competition failure mechanism of TC4 Ti-alloy was investigated by the control variable method. It is concluded that smaller W value, larger α-grain size and less α-grain content are beneficial to the internal cleavage failure of TC4 Ti-alloy. The value of W does not affect the probability of surface slip failure, and the increase of α-grain size or the decrease of α-grain contentis beneficial to the surface slip failure of TC4 Ti-alloy; The smaller W value, larger α-grain size and less α-grain content is all conducive to internal cleavage failure of TC4 titanium alloy.

Key words： metallic materials very-high cycle fatigue failure mechanism TC4 titanium alloy slip-cleavage competition failure

收稿日期: 2023-05-24

ZTFLH:

TG131

基金资助:内蒙古自治区自然科学基金(2022MS05014);内蒙古自治区自然科学基金(2021LHMS05009);内蒙古高等教育研究项目(NJZY21306);内蒙古自治区区直属高校基本科研业务项目(20220233);内蒙古工业大学科学研究项目(ZY202005)

通讯作者: 邓海龙，副教授，deng_hl@126.com，研究方向为结构及材料超高周疲劳特性

Corresponding author: DENG Hailong, Tel: 13674834148, E-mail: deng_hl@126.com

作者简介: 杨溥，男，1996年生，硕士

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https://www.cjmr.org/CN/10.11901/1005.3093.2023.267 或 https://www.cjmr.org/CN/Y2024/V38/I7/537

表1 TC4钛合金的化学成分

图1 TC4钛合金的疲劳试样

图2 TC4钛合金的微观形貌

图3 TC4钛合金的S-N曲线

图4 TC4钛合金的典型失效断口

图5 TC4钛合金的裂纹特征示意图

图6 TC4钛合金表面失效特征尺寸

图7 TC4钛合金内部失效特征尺寸

表2 GP分布下参数值评估

图8 aSD的累积概率分布函数关系曲线

图9 TC4钛合金控制体积以及区域划分示意图

图10 三种失效模式的失效概率随σmax的变化情况

图11 与σmax有关的三种失效模式的失效概率随W的变化情况

图12 与σmax有关的三种失效模式的失效概率随a晶粒尺寸的变化情况

图13 与σmax有关的三种失效模式的失效概率与α晶粒含量的关系

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