RESEARCH ON LOW AND HIGH CYCLE FATIGUE BEHAVIOR OF NI-CR ALLOY UNDER DIFFERENT FREQUENCY AT ROOM TEMPERATURE

WU HaiLi; AN ChunXiang; YU Xiao; LU LianTao

doi:10.16579/j.issn.1001.9669.2018.04.012

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RESEARCH ON LOW AND HIGH CYCLE FATIGUE BEHAVIOR OF NI-CR ALLOY UNDER DIFFERENT FREQUENCY AT ROOM TEMPERATURE

更新时间：2022-09-22

- RESEARCH ON LOW AND HIGH CYCLE FATIGUE BEHAVIOR OF NI-CR ALLOY UNDER DIFFERENT FREQUENCY AT ROOM TEMPERATURE
- Journal of Mechanical Strength Vol. 40, Issue 4, Pages: 834-838(2018)
- 作者机构：
  
  1. 上海电气电站设备有限公司上海汽轮机厂
  2. 西南交通大学牵引动力国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.16579/j.issn.1001.9669.2018.04.012
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WU HaiLi, AN ChunXiang, YU Xiao, et al. RESEARCH ON LOW AND HIGH CYCLE FATIGUE BEHAVIOR OF NI-CR ALLOY UNDER DIFFERENT FREQUENCY AT ROOM TEMPERATURE. [J]. 40(4):834-838(2018)
DOI：

WU HaiLi, AN ChunXiang, YU Xiao, et al. RESEARCH ON LOW AND HIGH CYCLE FATIGUE BEHAVIOR OF NI-CR ALLOY UNDER DIFFERENT FREQUENCY AT ROOM TEMPERATURE. [J]. 40(4):834-838(2018) DOI： 10.16579/j.issn.1001.9669.2018.04.012.

摘要

对Ni-Cr合金分别用不同频率进行室温低周疲劳试验(0.1 Hz~0.3 Hz,10~3~10~5周次)、常规高周疲劳试验(150 Hz,10~4~10~7周次)和超高周疲劳试验(20 k Hz,10~5~10~9周次),对三种疲劳形式下的应力寿命试验结果进行比较,并采用三参数幂函数能量-寿命曲线对试验数据进行统一表征。对疲劳断口进行扫描电镜观察分析可知:随着疲劳载荷幅的降低,疲劳裂纹源呈现由多处表面裂纹萌生转换为单个表面裂纹萌生,再转换为次表面裂纹萌生的趋势。

Abstract

Low cycle fatigue test（0.1 Hz ,0.3 Hz,10~3,10~5 cycles） and conventional high cycle fatigue test（150 Hz.10~4,10~7 cycles） and ultra-high cycle fatigue test（20 k Hz,10~5,10~9 cycles） were carried on Ni-Cr Alloy at room temperature.The results of the three forms fatigue test were compared,and the energy-life curve reduced by 3-parameters power function were fitted.The fractograph of specimens were investigated and analyzed with scanning electron microscope.The results show that the fatigue crack initiation sites change from multiple surface cracks to single surface crack,then to subsurface of specimen with decreasing the load amplitude.

关键词

镍基合金低周疲劳高周疲劳超高周疲劳次表面裂纹萌生三参数幂函数能量法频率效应孪晶

Keywords

Ni-based materialLow cycle fatigueHigh cycle fatigueUltra-high cycle fatigueSubsurface crack initiation3-parameters power function energy modelFrequency effectTwin structure

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