Thermal fatigue behavior of K465 superalloy

The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050℃. By scanning electron microscopy （SEM） and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast （named as K465） and sol...

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Veröffentlicht in:	Rare metals 2006-06, Vol.25 (3), p.202-209
Hauptverfasser:	YANG, Jinxia, ZHENG, Qi, SUN, Xiaofeng, GUAN, Hengrong, HU, Zhuangqi
Format:	Artikel
Sprache:	eng
Schlagworte:	carbides crack initiation and growth K465 superalloy K465高温合金 thermal fatigue 热疲劳碳化物裂纹发展裂纹萌生
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Zusammenfassung:	The thermal fatigue behavior of K465 superalloy was investigated at the peak temperature of 1050℃. By scanning electron microscopy （SEM） and optical microscopy, the main crack length was observed and measured. The initiation sites of the tested alloys are different in as-cast （named as K465） and solution heat treatment （named as SK465） conditions. In K465 alloy, most thermal fatigue cracks nucleate at （Nb,W,Ti）C carbides. In SK465 alloy, thermal fatigue cracks initiate in interdendritic regions, MC-type carbides and some interfaces. Thermal fatigue cracks propagate in transdendritic mode, and M6C-type carbides could retard thermal fatigue crack growth for SK465 superalloy.
ISSN:	1001-0521 1867-7185
DOI:	10.1016/S1001-0521(06)60040-5