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材料研究学报  2014, Vol. 28 Issue (9): 663-667    DOI: 10.11901/1005.3093.2013.138
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第二取向对镍基单晶高温合金DD33热疲劳性能的影响*
王莉(),周忠娇,姜卫国,王迪,申健,楼琅洪
中国科学院金属研究所 沈阳 110016
Effect of Secondary Orientation on Thermal Fatigue Behavior of a Nickel-base Single Crystal Superalloy DD33
Li WANG(),Zhongjiao ZHOU,Weiguo JIANG,Di WANG,Jian SHEN,Langhong LOU
Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016
引用本文:

王莉,周忠娇,姜卫国,王迪,申健,楼琅洪. 第二取向对镍基单晶高温合金DD33热疲劳性能的影响*[J]. 材料研究学报, 2014, 28(9): 663-667.
Li WANG, Zhongjiao ZHOU, Weiguo JIANG, Di WANG, Jian SHEN, Langhong LOU. Effect of Secondary Orientation on Thermal Fatigue Behavior of a Nickel-base Single Crystal Superalloy DD33[J]. Chinese Journal of Materials Research, 2014, 28(9): 663-667.

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摘要: 

选用不同第二取向的第三代镍基单晶高温合金DD33板式试样进行热疲劳实验, 研究了第二取向对单晶高温合金热疲劳性能的影响和不同第二取向样品的热疲劳裂纹扩展动力学。结果表明: 第二取向严重影响合金的热疲劳性能。两种第二取向样品, 其热疲劳裂纹萌生位置和扩展方向明显不同。在第二取向[100]的样品中, 热疲劳裂纹在与定向凝固方向呈45°的孔壁处萌生并沿与定向凝固方向呈45°方向扩展; 而在第二取向为[110]的样品中, 热疲劳裂纹优先在与定向凝固方向垂直的孔壁处萌生并沿定向凝固方向扩展且裂纹萌生及扩展速度都明显快于第二取向[100]的样品。

关键词 金属材料镍基单晶高温合金热疲劳第二取向    
Abstract

The effect of secondary orientation on thermal fatigue behavior of a third generation nickel-based single crystal superalloy DD33 was investigated. Samples with different secondary orientations were machined along (100) and (110) plane, respectively, and thermal fatigue test was performed cyclicly between room temperature and 1100oC. It was found that different initiation sites and propagation orientations of the thermal fatigue cracks were observed in samples with different secondary orientations. In samples with secondary orientation of [100], thermal cracks initiated at the edge of the holes along a direction with 45o incline to the directional solidification (DS) direction and propagated along also the derection with 45o incline to the DS direction. While in samples with secondary orientation of [110], thermal cracks initiated at the edge of the holes vertical to the DS direction and propagated along the DS direction. In general, samples with secondary orientation of [100] exhibited better thermal fatigue properties than that of [110] samples.

Key wordsmetallic materials    single crystal superalloy    thermal fatigue    secondary orientation
收稿日期: 2014-03-26     
基金资助:* 国家自然科学基金51201164,国家九七三计划2010CB631201和国家八六三计划2012AA03A511资助项目。
图1  不同第二取向热疲劳样品示意图
图2  热疲劳试样表面的组织形貌
图3  不同第二取向样品室温-1100℃热疲劳实验120周次后孔周围的组织
图4  热疲劳过程中不同第二取向样品裂纹扩展动力学曲线
图5  不同第二取向样品中缺口周围90°点和45°点位置热应力分析示意图
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