刘雪莹,陈立佳,周舸,王宝森.应变波形对Inconel 625合金低周疲劳性能的影响[J].稀有金属材料与工程,2021,50(4):1263~1269.[Liu Xueying,Chen Lijia,Zhou Ge,Wang Baosen.Effect of Strain Waveform on Low-Cycle Fatigue Properties of Inconel 625 Alloy[J].Rare Metal Materials and Engineering,2021,50(4):1263~1269.]
应变波形对Inconel 625合金低周疲劳性能的影响
投稿时间:2020-02-20  修订日期:2020-03-13
中文关键词:  Inconel 625合金  低周疲劳  应变波形  断口形貌  失效形式
基金项目:国家自然科学基金资助(项目号51805335)
中文摘要:
      在650°C以及拉压对称三角波、慢拉快压锯齿波和快拉慢压锯齿波三种应变波形下对Inconel 625合金进行了低周疲劳实验,研究了合金在不同应变波形下的低周疲劳变形与断裂行为。结果表明:三种应变波形加载条件下,合金在0.3%~0.7%的外加总应变幅下均呈现循环硬化,其中在慢拉快压锯齿波形下的循环应力幅最高;采用锯齿波形时,由于拉伸蠕变分量和压缩蠕变分量的引入造成合金的疲劳寿命缩短;此外,合金的循环应力和应变之间呈现单斜率线性关系,且其塑性应变幅与弹性应变幅和疲劳寿命之间亦呈线性关系。利用扫描电子显微镜对Inconel 625合金在三种加载波形下的低周疲劳断口形貌进行的观察结果表明,Inconel 625合金的疲劳裂纹萌生和扩展均是以穿晶方式进行的。
Effect of Strain Waveform on Low-Cycle Fatigue Properties of Inconel 625 Alloy
英文关键词:Inconel 625 alloy  low-cycle fatigue  strain waveform  microstructure  failure mode
英文摘要:
      The low-cycle fatigue tests for the Inconel 625 alloy were performed at 650°C under three strain waveforms including triangular waveform as well as two sawtooth waveforms with slow-tension followed by fast-compression and fast-tension followed by slow-compression. And the low cycle fatigue deformation and fracture behaviors of the alloy under different strain waveforms were investigated. The experimental results show that the Inconel 625 alloy exhibits the cyclic hardening at the different waveforms and applied total strain amplitudes from 0.3% to 0.7%. When two sawtooth waveforms are adopted, the fatigue life of the alloy will shorten due to the introduction of either tensile or compressive creep strain component, In addition, the relation between the plastic or elastic strain amplitudes and fatigue life as well as between the cyclic stress amplitude and plastic strain amplitude exhibits a single slope linear behavior. The observations on the fatigue fracture surfaces reveal that under three strain waveforms used in this investigation, the fatigue cracks initiate and propagate in a transgranular mode.
作者单位E-mail
刘雪莹 沈阳工业大学材料科学与工程学院 Lxy_941203@163.com 
陈立佳 沈阳工业大学材料科学与工程学院 chenlj-sut@163.com 
周舸 沈阳工业大学材料科学与工程学院  
王宝森 宝钢股份有限公司研究院  
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