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金属学报  2015, Vol. 51 Issue (4): 449-457    DOI: 10.11900/0412.1961.2014.00425
  论文 本期目录 | 过刊浏览 |
缺口取向和再结晶对一种定向凝固钴基高温合金热疲劳性能的影响
濮晟1, 2, 王莉2, 3, 谢光2, 3, 丁贤飞4, 楼琅洪2, 冯强1, 4
1 北京科技大学新金属材料国家重点实验室, 北京 100083; 2 中国科学院金属研究所, 沈阳 110016; 3 中国科学院金属研究所沈阳材料科学国家(联合)实验室, 沈阳 110016; 4 北京科技大学国家材料服役安全科学中心, 北京 100083
EFFECT OF NOTCH ORIENTATION AND LOCAL RECRYSTALLIZATION ON THERMAL FATIGUE PROPERTIES OF A DIREC- TIONALLY SOLIDIFIED Co-BASED SUPERALLOY
PU Sheng1, 2, WANG Li2, 3, XIE Guang2, 3, DING Xianfei4, LOU Langhong2, FENG Qiang1, 4
1 State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083; 2 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016; 3 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016; 4 National Center for Materials Service Safety, University of Science and Technology Beijing, Beijing 100083
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摘要: 在定向凝固钴基高温合金中采用V型缺口分别垂直和平行于凝固方向的板状热疲劳试样, 并在缺口位置预制再结晶组织, 研究了在最高温度为1000 ℃, 最低温度为室温的冷热循环下, 缺口取向和再结晶对定向凝固钴基高温合金热疲劳性能的影响. 结果表明, 缺口取向垂直于凝固方向时, 基体在应力作用下循环氧化开裂; 缺口平行于凝固方向时, 热疲劳性能下降, 裂纹沿枝晶间扩展. 再结晶降低定向凝固钴基高温合金的热疲劳性能, 再结晶晶界氧化开裂, 晶界析出的M23C6型碳化物氧化脱落后形成的孔洞加速了裂纹扩展; 连接枝晶间碳化物的再结晶晶界成为缺口平行于凝固方向时热疲劳裂纹的优先扩展通道.
关键词 缺口取向再结晶热疲劳定向凝固钴基高温合金    
Abstract:The directionally solidificated (DS) Co-based superalloys are widely used in aircraft turbine vanes due to the good stress-rupture parameters and excellent hot corrosion resistance. The cyclic change of temperatures and complex stress state thermal fatigue (TF) cracks happen frequently in vanes during service. However, most of the work are conducted in Ni-based superalloys and there is rare report concerning the TF behavior of DS Co-based superalloys. Furthermore, due to the residual strain accumulated during processing, shot peening, grinding and recrystallization (RX) frequently occur when the DS components are exposed to high temperatures. It is believed that RX may change the microstructure, especially adding more grain boundaries to DS alloys, and result in the reduction of the mechanical properties of DS superalloys. Therefore, in this work, V-notch plate specimens with notch direction perpendicular and parallel to the DS orientation are machined from the DS plate. Local RX grains are prepared (local indented and then heat treated) in the notch areas of some samples. TF test is conducted between 1000 ℃ to room temperature. The effect of DS orientation and RX on TF properties of a DS Co-based superalloy is investigated. The results indicate that the cracks propagate along the interdendritic regions in the samples with notches parallel to the DS direction, which exhibites lower TF properties than samples with notches vertical to the DS direction. TF cracks initiate and propagate along RX boundaries in samples containing RX grains. Precipitation of M23C6 carbides is found along the RX boundaries during TF tests. Due to the oxidation at the tip of crack, M23C6 desquamates and leads to the formation of micro voids, which accelerates the crack propagation and decreases TF properties of tested alloy. In samples with notches parallel to the DS direction, cracks preferentially propagate along the RX grain boundaries.
Key wordsnotch orientation    recrystallization    thermal fatigue    directional solidification    Co-based superalloy
    
ZTFLH:  TG132.3  
基金资助:*国家重点基础研究发展计划项目2010CB631201, 国家高技术研究发展计划项目2012AA03A513, 国家自然科学基金项目50901079和教育部支撑技术项目 625010337资助
Corresponding author: Correspondent: FENG Qiang, professor, Tel: (010)82375850, E-mail: qfeng@skl.ustb.edu.cn     E-mail: qfeng@skl.ustb.edu.cn
作者简介: 濮 晟, 男, 1981年生, 工程师

引用本文:

濮晟, 王莉, 谢光, 丁贤飞, 楼琅洪, 冯强. 缺口取向和再结晶对一种定向凝固钴基高温合金热疲劳性能的影响[J]. 金属学报, 2015, 51(4): 449-457.
PU Sheng, WANG Li, XIE Guang, DING Xianfei, LOU Langhong, FENG Qiang. EFFECT OF NOTCH ORIENTATION AND LOCAL RECRYSTALLIZATION ON THERMAL FATIGUE PROPERTIES OF A DIREC- TIONALLY SOLIDIFIED Co-BASED SUPERALLOY. Acta Metall Sin, 2015, 51(4): 449-457.

链接本文:

https://www.ams.org.cn/CN/10.11900/0412.1961.2014.00425      或      https://www.ams.org.cn/CN/Y2015/V51/I4/449

Images/0895-3988-449/grpD779  定向凝固钴基高温合金横向和纵向热疲劳试样的示意图
Images/0895-3988-449/imgD7C8  定向凝固钴基高温合金铸态显微组织的OM像
Images/0895-3988-449/grpD827  定向凝固钴基高温合金中碳化物的SEM和BSE像
Images/0895-3988-449/grpD8C4  M7C3型碳化物和MC型碳化物的EDS分析
Images/0895-3988-449/grpD8F4  铸态定向凝固高温合金经1250 ℃退火90 min后碳化物的XRD谱
Images/0895-3988-449/grpD904  铸态和压痕变形定向凝固钴基高温合金经1250 ℃退火90 min后的OM像
Images/0895-3988-449/grpD9A1  定向凝固钴基高温合金的热疲劳裂纹长度L与冷热循环周次N的关系曲线
Images/0895-3988-449/imgD9B2  不含再结晶的横向定向凝固钴基高温合金经不同周次热疲劳后裂纹的OM像
Images/0895-3988-449/grpDA01  横向定向凝固钴基高温合金75次冷热循环后主裂纹前沿的SEM像及EDS分析
Images/0895-3988-449/grpDA6F  含再结晶的横向定向凝固钴基高温合金不同循环周次后的裂纹形貌OM和SEM像
Images/0895-3988-449/grpDC63  纵向定向凝固钴基高温合金不同周次热疲劳后裂纹的萌生和扩展形貌
Images/0895-3988-449/grpDD4E  含再结晶的纵向定向凝固钴基高温合金裂纹的萌生和扩展及裂纹附近碳化物形貌
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