| 定向凝固合金DZ17G的高温低周疲劳性能研究 |
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| 引用本文： | 廖鄂斌,郭建亭,王淑菏. 定向凝固合金DZ17G的高温低周疲劳性能研究[J]. 金属学报, 1998, 34(3): 278-282 |
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| 作者姓名： | 廖鄂斌 郭建亭 王淑菏 |
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| 作者单位： | 中国科学院金属研究所!沈阳，110015 |
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| 摘 要： | 研究了定向凝固镍基高温合金ＤＡ１７Ｇ在８００℃下的低周疲劳性能，得到其循环应力－应弯曲线和应变－寿命曲线，并用最小二乘法回归至Ｍａｎｓｏｎ－ｏｆｆｉｎ方程的数学表达式；对疲劳断口进行了宏观及微观分析，发现裂纹主要在试样内部及近表面缺陷外萌生，裂纹一旦形成即穿晶扩展，且扩展方向垂直于加载轴。
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| 关 键 词： | 定向凝固 镍基 高温合金 高温低周疲劳 |
| 收稿时间： | 1998-03-18 |
| 修稿时间： | 1998-03-18 |
LCF BEHMIOUR OF DS ALLOY DZ17G AT HIGH TEMPERATURE |
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| LIAO Ebin,GUO Jianting,WANG Shuhe. LCF BEHMIOUR OF DS ALLOY DZ17G AT HIGH TEMPERATURE[J]. Acta Metallurgica Sinica, 1998, 34(3): 278-282 |
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| Authors: | LIAO Ebin GUO Jianting WANG Shuhe |
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| Affiliation: | LIAO Ebin,GUO Jianting,WANG Shuhe(Institute of Metal Research,The Chinese Academy of Scineces,Shenyang ) |
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| Abstract: | Low cyclic fitigue (LCF) behaviour of a directionally solidified (DS) nickel-base superalloy at high temperature was studied in this paper. Its cyclic stress-strain curve and strain-life curve were obtained. Manson-Coffin equation was obtained through least-square procedure. By macro-and micro-scopy observation, it was discovered that cracks initiated predominantly at interior and near-surface defects. Once formed, cracks propagated transgranularly and normal to the loading direction. |
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| Keywords: | directionally solidilication Ni-base superalloy high temperature LCF ocrack initiation dricroshinkage |
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