涂层型螺栓的弱化机理分析及加工工艺改进

应少军, 陈志同, 李建伟, 赵越

清华大学学报(自然科学版) ›› 2022, Vol. 62 ›› Issue (9) : 1539-1547.

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清华大学学报(自然科学版) ›› 2022, Vol. 62 ›› Issue (9) : 1539-1547. DOI: 10.16511/j.cnki.qhdxxb.2022.22.038
机械工程

涂层型螺栓的弱化机理分析及加工工艺改进

  • 应少军1,2, 陈志同1, 李建伟3, 赵越2
作者信息 +

Coated bolt weakening mechanism and processing improvements

  • YING Shaojun1,2, CHEN Zhitong1, LI Jianwei3, ZHAO Yue2
Author information +
文章历史 +

摘要

针对某型号直升机旋翼系统的关键连接螺栓存在疲劳寿命明显不足的现象,采用显微硬度分布以及扫描电子显微镜(SEM)/电子背散射衍射(EBSD)分析,发现螺栓基体在车削、磨削和喷砂的机加工处理后,表面残留的变质层叠加区对WC-10Co4Cr涂层与基体结合强度产生不利影响,进而造成的基体-涂层界面早期开裂失效是螺栓疲劳寿命明显不足的主要原因。通过采用加大磨削量来消除变质层叠加区的加工工艺后,螺栓涂层与基体的显微硬度分布更加均匀,平均疲劳寿命比原螺栓提高了3倍。这主要是因为加工变质层叠加区的去除使螺栓表面的硬度有所提高,且硬度分布更加均匀,进而减缓了基体与涂层的硬度梯度,使涂层与基体的结合强度显著提高。

Abstract

Some key coated joint bolts on helicopter rotor systems had poor fatigue lives. This study investigated the microhardness distribution in these bolts using the scanning electron microscope (SEM) and electron back-scattered diffraction (EBSD) tests. The tests showed that the deteriorated layers induced by turning, machining and shot blasting overlapped at the bolt substrate surface, which negatively impacted the bonding strength between the WC-10Co4Cr coating and the substrate. The poor fatigue life was found to be mainly due to premature cracking of the substrate-coating interface. The grinding depth was then increased to eliminate the overlapping deteriorated layers to more uniformly distribute the microhardness between the coating and the bolt substrate which lengthened the fatigue life 3 folds relative to the original bolt. This result is mainly due to the removal of the overlapping deteriorated layers which improves the hardness as well as the bolt surface homogeneity and relieves the hardness gradient between the substrate and the coating, which significantly improves the adhesion between the coating and the substrate.

关键词

涂层螺栓 / 疲劳寿命 / 基体-涂层界面 / 显微硬度 / 电子背散射衍射

Key words

coated bolt / fatigue life / substrate-coating interface / microhardness / electron back-scattered diffraction

引用本文

导出引用
应少军, 陈志同, 李建伟, 赵越. 涂层型螺栓的弱化机理分析及加工工艺改进[J]. 清华大学学报(自然科学版). 2022, 62(9): 1539-1547 https://doi.org/10.16511/j.cnki.qhdxxb.2022.22.038
YING Shaojun, CHEN Zhitong, LI Jianwei, ZHAO Yue. Coated bolt weakening mechanism and processing improvements[J]. Journal of Tsinghua University(Science and Technology). 2022, 62(9): 1539-1547 https://doi.org/10.16511/j.cnki.qhdxxb.2022.22.038

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