缺口应力集中系数对<strong>TC4 ELI</strong>合金低周疲劳性能的影响

doi:10.11901/1005.3093.2022.315

材料研究学报

2023, Vol. 37

Issue (7): 511-522 DOI: 10.11901/1005.3093.2022.315

研究论文

本期目录 | 过刊浏览

缺口应力集中系数对TC4 ELI合金低周疲劳性能的影响

刘天福¹, 张滨¹(

), 张均锋², 徐强³, 宋竹满⁴, 张广平⁴

^1.东北大学材料各向异性与织构教育部重点实验室材料科学与工程学院沈阳 110819
^2.中国科学院力学研究所北京 100190
^3.中国船舶科学研究中心无锡 214082
^4.中国科学院金属研究所沈阳材料科学国家研究中心沈阳 110016

Effect of Notch Stress Concentration Factors on Low-cycle Fatigue Performance of TC4 ELI Alloy

LIU Tianfu¹, ZHANG Bin¹(

), ZHANG Junfeng², XU Qiang³, SONG Zhuman⁴, ZHANG Guangping⁴

^1.Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shengyang 110819, China
^2.Institute of Mechanics, Chinese Academy of Sciences, Beijing 100190, China
^3.China Ship Scientific Research Center, Wuxi 214082, China
^4.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

引用本文:

刘天福, 张滨, 张均锋, 徐强, 宋竹满, 张广平. 缺口应力集中系数对TC4 ELI合金低周疲劳性能的影响[J]. 材料研究学报, 2023, 37(7): 511-522.
Tianfu LIU, Bin ZHANG, Junfeng ZHANG, Qiang XU, Zhuman SONG, Guangping ZHANG. Effect of Notch Stress Concentration Factors on Low-cycle Fatigue Performance of TC4 ELI Alloy[J]. Chinese Journal of Materials Research, 2023, 37(7): 511-522.

全文: PDF(15767 KB) HTML

摘要:

研究了缺口应力集中系数不同的深海潜水器耐压壳用TC4 ELI(Extra-low-interstitial) 合金板材在恒总应变幅控制下的低周疲劳行为。结果表明，在应变幅较低(0.7%以下)和应变幅较高(0.8%和0.9%)条件下的光滑试样在循环初期分别发生了循环硬化和循环软化，而缺口试样在0.2%~0.7%应变幅条件下的循环初期均发生了循环硬化。通过循环载荷作用下材料滞回能的变化描述了TC4 ELI合金试样低周疲劳的损伤程度，得到了缺口应力集中系数与低周疲劳性能参数之间的关系，建立了相对裂纹萌生寿命预测模型。利用该模型能较好地预测缺口应力集中系数较低的TC4 ELI合金在高应变幅条件下的相对疲劳裂纹萌生寿命。

关键词 ：金属材料, TC4 ELI合金, 低周疲劳, 缺口, 应力集中系数, 疲劳寿命

Abstract：

The low-cycle fatigue behavior of TC4 ELI (Extra-low-interstitial) alloy plates for pressure shells in deep-sea submersible with different notch stress concentration factors under constant total strain amplitude was investigated. The results indicate that cyclic harding and cyclic softening occur in the smooth specimens under the lower strain amplitude (≤0.7%) and higher strain amplitudes (0.8% and 0.9%), respectively, at the initial stage of the cyclic loading. While the cyclic hardening occurs in all the notched specimens under the strain amplitudes of 0.2% to 0.7% at the initial stage of the cyclic loading. Based on the variation of material hysteretic energy under the cyclic loading, a relative crack initiation life prediction model was established to describe the damage degree of TC4ELI alloy specimens under the low cycle fatigue loading. The relationship between notch stress concentration factors and low cycle fatigue performance parameters was also described. This model can effectively predict the relative fatigue crack initiation life of TC4ELI alloy with low notch stress concentration factor under high strain amplitude conditions.

Key words： metallic material TC4 ELI alloy low cycle fatigue notch Stress concentration factor fatigue life

收稿日期: 2022-06-07

ZTFLH:

TB31

基金资助:国家自然科学基金(51971060);国家自然科学基金(52171128)

通讯作者: 张滨，教授，zhangb@atm.neu.edu.cn，研究方向为先进工程材料制备与性能

Corresponding author: ZHANG Bin, Tel: (024) 83691585, E-mail: zhangb@atm.neu.edu.cn

作者简介: 刘天福，男，1997年生，硕士生

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表1 TC4 ELI合金的名义成分

图1 不同缺口应力集中系数的TC4 ELI低周疲劳试样的尺寸和加工精度

图2 轧制态TC4 ELI合金的光学显微组织

图3 缺口应力集中系数不同的TC4 ELI合金的应力幅随循环周次的变化曲线

图4 缺口应力集中系数不同的TC4 ELI试样的循环应力-应变滞回线

图5 不同应变幅控制下TC4 ELI合金光滑试样疲劳断口的SEM照片

图6 三种缺口应力集中系数的TC4 ELI合金缺口试样在应变幅为0.3%控制下疲劳断口的SEM照片

图7 TC4 ELI合金光滑试样在不同应变幅控制下疲劳断口处的TEM照片

图8 缺口应力集中系数不同的TC4 ELI合金的应力幅与塑性应变幅拟合曲线图及循环强度系数和循环应变硬化指数随缺口应力集中系数的变化

表2 缺口应力集中系数不同的TC4 ELI合金的疲劳性能参数

图9 光滑试样在总应变幅为0.9%控制下TC4 ELI合金的滞回能与相对循环周次(N/Nf )的关系以及滞回能曲线中五个参考点对应的滞回线

图10 缺口应力集中系数不同的合金的滞回能与相对循环周次关系以及相对疲劳裂纹萌生寿命与Δεt /2和Kt 的关系

图11 TC4 ELI合金的相对疲劳裂纹萌生寿命与总应变幅的关系

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