张浩楠,张继旺,李行,卢琪,朱守东.高速列车车轴用EA4T钢腐蚀疲劳性能研究[J].表面技术,2021,50(10):279-285, 300.
ZHANG Hao-nan,ZHANG Ji-wang,LI Hang,LU Qi,ZHU Shou-dong.Corrosion Fatigue Behavior of EA4T Steel for High Speed Train Axles[J].Surface Technology,2021,50(10):279-285, 300 |
| 高速列车车轴用EA4T钢腐蚀疲劳性能研究 |
| Corrosion Fatigue Behavior of EA4T Steel for High Speed Train Axles |
| 投稿时间：2021-01-29 修订日期：2021-04-23 |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.10.028 |
| 中文关键词: EA4T 腐蚀 疲劳 表面损伤 人造雨水 裂纹扩展门槛值 |
| 英文关键词:EA4T corrosion fatigue surface damage artificial rain crack growth threshold value |
| 基金项目:国家自然科学基金(51675445);牵引动力国家重点实验室自主研究课题(2019TPL-T06) |
|
|
| Author | Institution |
| ZHANG Hao-nan | State-Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China |
| ZHANG Ji-wang | State-Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China |
| LI Hang | State-Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China |
| LU Qi | State-Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China |
| ZHU Shou-dong | State-Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, China |
|
| 摘要点击次数: |
| 全文下载次数: |
| 中文摘要: |
| 目的 研究腐蚀环境中EA4T车轴钢疲劳性能，为车轴的腐蚀检测和使用寿命评估提供依据。方法 采用旋转弯曲疲劳试验机，在人造雨水模拟的腐蚀环境和空气环境中，对EA4T车轴钢试样进行疲劳试验，以获得不同环境下试样的疲劳S-N曲线、表面损伤以及裂纹扩展规律。然后对扩展裂纹进行概率统计，通过扫描电镜对疲劳失效的断口进行观察，并分析对比不同环境中裂纹扩展门槛值的变化。结果 空气环境中，试样的疲劳极限为355 MPa，而在腐蚀环境中，试样不存在疲劳极限，107循环周次对应的疲劳强度降低到245 MPa，相比空气环境中降低了31%。Gumbel分布统计与Weibull双参数分布统计相比，更适合描述EA4T车轴钢试样表面腐蚀裂纹长度随加载次数的变化。腐蚀环境中，疲劳裂纹萌生于表面腐蚀坑，并存在多个裂纹源。腐蚀环境显著降低了试样裂纹扩展门槛值，空气环境下，该值为6.29 MPa.m1/2，腐蚀环境下降低到4.1 MPa.m1/2。结论 腐蚀环境降低EA4T钢疲劳寿命的主要原因是，腐蚀环境降低了裂纹扩展门槛值，加快了裂纹萌生以及短裂纹扩展。而当裂纹达到一定长度时，腐蚀环境对裂纹扩展几乎没有影响。 |
| 英文摘要: |
| The fatigue performance of EA4T axle steel in corrosive environment was studied to provide the basis for corrosion detection and service life evaluation of axle. The fatigue test of EA4T axle steel specimen was carried out by rotating bending fatigue testing machine in air environment and corrosive environment simulated by artificial rainwater to get the fatigue S-N curves, surface damage and crack propagation of the samples under different environments. Then the probability of crack propagation was calculated. The fatigue failure fracture was observed by scanning electron microscopy, and the change of crack growth threshold in different environments was analyzed and compared. The fatigue limit of samples in the air environment was 355 MPa, while in the corrosive environment, there was no fatigue limit. The fatigue strength corresponding to 107 cycles was reduced to 245 MPa, which was 31% lower than that in the air environment; Gumbel distribution statistics was more suitable than Weibull distribution statistics to describe the change of corrosion crack length on EA4T axle steel specimen surface with loading times; In corrosive environment, fatigue cracks originate in surface corrosion pits, and multiple crack sources exist; The threshold value of crack growth in corrosive environment was significantly reduced, which was 6.29 MPa.m1/2 in air environment and 4.1 MPa.m1/2 in corrosive environment. Corrosion environment reduces fatigue life of EA4T steel mainly because it reduced the threshold of crack propagation, accelerated crack initiation and short crack propagation, when the crack reached a certain length, corrosion environment had little effect on crack propagation. |
| 查看全文 查看/发表评论 下载PDF阅读器 |
| 关闭 |
|
|
|
渝公网安备 50010702501715号