HOT DEFORMATION BEHAVIOR OF Ni76Cr19AlTi SUPERALLOY

Acta Metall Sin

2006, Vol. 42

Issue (6): 629-634 DOI:

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HOT DEFORMATION BEHAVIOR OF Ni76Cr19AlTi SUPERALLOY

TENG Hao; YIN Zhimin; ZHU Yuanzhi; ZHOU Kechao; LI Zhiyoue

中南大学材料学院

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TENG Hao; YIN Zhimin; ZHU Yuanzhi; ZHOU Kechao; LI Zhiyoue. HOT DEFORMATION BEHAVIOR OF Ni76Cr19AlTi SUPERALLOY. Acta Metall Sin, 2006, 42(6): 629-634 .

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Abstract The hot deformation behavior of Ni76Cr19AlTi alloy was studied by compression test of cylindrical specimen at constant temperature and constant strain rate in a Gleeble-1500 system. The deformation temperature ranges from 800 ℃ to 1150 ℃, strain rate from 10 -3 s -1 to 1 s -1. The results show that Ni76Cr19AlTi alloy has a large deformed resistance and is easily fractured when deformed at 800℃ and 850℃. But when compressing at a temperature range of 950--1150℃, the resistance to deformation reduces and the alloy doesn't fracture because of dynamic crystallization. The measurement of the flow stress of the alloy in high temperature range of 950-1150 ℃ showed that the thermal deformation activation energy Q is 376.84 kJ/mol and stress exponent n is 4.15. By analyzing the true stress-strain curves for the alloy at hot compression and its deformation mechanism, the suitable deformation condition is at the temperature range from 1050 ℃ to 1150 ℃ with strain rate from 10 -1 s -1 to 10 0 s -1.

Key words: Ni76Cr19AlTi alloy exhaust valve hot compression deformation

Received: 15 August 2005

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	TENG Hao
	YIN Zhimin
	ZHU Yuanzhi
	ZHOU Kechao
	LI Zhiyoue

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2006/V42/I6/629

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