<strong>8.8</strong>级螺栓用<strong>ML40Cr</strong>钢的疲劳性能和裂纹扩展行为

doi:10.11901/1005.3093.2019.207

材料研究学报

2019, Vol. 33

Issue (10): 771-775 DOI: 10.11901/1005.3093.2019.207

研究论文

本期目录 | 过刊浏览

8.8级螺栓用ML40Cr钢的疲劳性能和裂纹扩展行为

王源晨¹,宋竹满¹,李瑞²,史文博³,朱艳坤¹,张广平¹(

)

1. 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
2. 浙江华电器材检测研究所有限公司杭州 310015
3. 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

Fatigue Properties and Crack Growth Behavior of ML40Cr Steel for 8.8-grade Bolts

WANG Yuanchen¹,SONG Zhuman¹,LI Rui²,SHI Wenbo³,ZHU Yankun¹,ZHANG Guangping¹(

)

1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Zhejiang Huadian Equipment Testing Institute Co. Ltd. , Hangzhou 310015, China
3. Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education, School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China

引用本文:

王源晨,宋竹满,李瑞,史文博,朱艳坤,张广平. 8.8级螺栓用ML40Cr钢的疲劳性能和裂纹扩展行为[J]. 材料研究学报, 2019, 33(10): 771-775.
Yuanchen WANG, Zhuman SONG, Rui LI, Wenbo SHI, Yankun ZHU, Guangping ZHANG. Fatigue Properties and Crack Growth Behavior of ML40Cr Steel for 8.8-grade Bolts[J]. Chinese Journal of Materials Research, 2019, 33(10): 771-775.

全文: PDF(3730 KB) HTML

摘要:

针对紧固螺栓在不同预紧力下的疲劳可靠性问题，对ML40Cr钢母材进行拉-拉疲劳和对称三点弯曲实验，研究输电铁塔用8.8级紧固螺栓用钢的疲劳性能和裂纹扩展行为。拉-拉疲劳实验的结果表明，在不同应变幅的疲劳加载条件下，以材料抗拉强度的50%作为平均应力时ML40Cr光滑试样的疲劳极限为263 MPa，缺口试样的疲劳极限为95 MPa。用有效应力( $σ ˉ$ )参数法处理平均应力对ML40Cr疲劳曲线的影响，得到8.8级螺栓用钢ML40Cr的疲劳缺口敏感度为0.31。依据对称三点弯曲实验的疲劳实验结果，得到8.8级螺栓用钢ML40Cr的裂纹扩展速率关系式为 $d a / d N = 10 - 10 ? K 2.2$ 。探讨ML40Cr用钢的缺口疲劳强度和疲劳裂纹扩展机制。

关键词 ：材料失效与保护, 疲劳性能, 缺口敏感度, 裂纹扩展, 8.8级螺栓

Abstract：

ML40Cr steel for 8.8-grade bolts of power transmission towers was selected as research object in this paper. Considering the fatigue reliability of the bolts fastened under different pre-stresses, tension-tension fatigue and symmetric three-point bending experiments were conducted to investigate the fatigue properties and fatigue crack propagation behavior of ML40Cr steel samples, respectively. The experimental results show that the fatigue limits for smooth samples and notched samples of the ML40Cr steel are 263 MPa and 95 MPa, respectively when the 50% of tensile strength was adopted as the mean stress with different stress amplitudes. The effect of the mean stress on the stress-fatigue life (S-N) curve of the ML40Cr steel samples was investigated by the effective stress method and the corresponding fatigue notch sensitivity 0.31 was obtained. According to the results of symmetrical three-point bending tests the Paris formula of ML40Cr steel for 8.8 bolts is fitted as $d a / d N = 10 - 10 ? K 2.2$ . Mechanisms of notch fatigue strength and crack growth of the ML40Cr steel for the bolts were also discussed.

Key words： materials failure and protection fatigue properties notch sensitivity crack growth grade 8.8 bolts

收稿日期: 2019-04-20

ZTFLH:

TM752

基金资助:国网浙江省科技项目(5211HD180005)

作者简介: 王源晨，女，1992年生，博士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.207 或 https://www.cjmr.org/CN/Y2019/V33/I10/771

表1 8.8级螺栓的化学成分

图1 光滑疲劳试样、缺口疲劳试样和单边缺口疲劳试样的尺寸示意图

图2 ML40Cr初始样品的金相组织

图3 光滑及缺口螺栓的疲劳加载应力幅-疲劳寿命S-N曲线

图4 光滑和缺口试样的疲劳断口

图5 疲劳裂纹扩展速率与裂纹尖端应力集中系数之间的关系

图6 有效应力参数-疲劳寿命关系曲线

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