The low-cycle fatigue and fatigue-crack-growth behavior of HAYNES® HR-120 alloy
The low-cycle fatigue and fatigue-crack-growth behavior of HAYNES® HR-120 alloy
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HAYNES® HR-120 合金的低周疲劳和疲劳裂纹扩展行为
DOI：
10.1007/s11661-003-0257-z
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
D. Klarstrom
中科院分区：
文献类型：
--
作者：
L. Chen;P. Liaw;R. McDaniels;D. Klarstrom
在实验室空气中 24°C 至 980°C 的温度范围内研究了 HAYNES HR-120 合金的低周疲劳和疲劳裂纹扩展行为。结果表明，升高温度通常会导致低周疲劳寿命大幅下降。疲劳寿命的缩短可归因于氧化和动态应变时效（DSA）过程。分析了在不同温度下获得的应变与疲劳寿命数据。还发现，每个循环的疲劳裂纹扩展率通常随着温度和 R 比的增加而增加（R = σmin/σmax，其中 σmin 和 σmax 分别是施加的最小和最大应力）。确定了应力强度因子范围与疲劳裂纹扩展速率之间的关系。断口表面的扫描电子显微镜 (SEM) 检查表明，疲劳裂纹主要以穿晶模式引发和扩展。
The low-cycle fatigue and fatigue-crack-growth behavior of the HAYNES HR-120 alloy was investigated over the temperature range of 24°C to 980°C in laboratory air. The result showed that increasing the temperature usually led to a substantial decrease in the low-cycle fatigue life. The reduction of fatigue life could be attributed to oxidation and dynamic strain-aging (DSA) processes. The strainvsfatigue-life data obtained at different temperatures were analyzed. It was also found that the fatigue-crack-growth rate per cycle generally increased with increasing temperature andRratio (R=σmin/σmax, whereσminandσmaxare the applied minimum and maximum stresses, respectively). The relationship between the stress-intensity-factor range and fatigue-crack-growth rate was determined. Scanning-electron-microscopy (SEM) examinations of the fracture surfaces revealed that the fatigue cracks initiated and propagated predominantly in a transgranular mode.