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OALib Journal期刊
ISSN: 2333-9721
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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
DOI: 10.11900/0412.1961.2014.00425, PP. 449-457
Keywords: 缺口取向,再结晶,热疲劳,定向凝固,钴基高温合金
Abstract:
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.
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