High Temperature Creep Behavior Of Cast Ni Base Superalloy K44

Acta Metall Sin

2004, Vol. 40

Issue (6): 579- DOI:

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High Temperature Creep Behavior Of Cast Ni Base Superalloy K44

HOU Jieshan; ZHANG Yulong; GUO Jianting;JI Guang; ZHOU Lanzhang; YE Hengqiang

Institute of Metal Research; The Chinese Academy of Science; Shenyang 110016

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HOU Jieshan; ZHANG Yulong; GUO Jianting; JI Guang; ZHOU Lanzhang; YE Hengqiang. High Temperature Creep Behavior Of Cast Ni Base Superalloy K44. Acta Metall Sin, 2004, 40(6): 579-.

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Abstract High temperature tensile creep behaviors of cast nickel—based superalloy K44 in the temperature range of 850---900℃ and under the applied stress range of 225---380 MPa have been studied. The results indicate that all of the creep curves of test alloys have similar shape: a short primary creep and a dominant accelerated creep stage, and the long accelerated stage is due to the interaction between rafting r’ particles and dislocations. As the creep strain is a softening stage, the accelerated creep can be approximately described by expression. The creep fracture data follow the Monkman--Grant relationship. Cracks originate from the cavities at grain boundary or interdendritic.

Key words: nickel--based superalloy high temperature creep creep fracture

Received: 10 June 2003

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	HOU Jieshan
	ZHANG Yulong
	GUO Jianting
	JI Guang
	ZHOU Lanzhang
	YE Hengqiang

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https://www.ams.org.cn/EN/ OR https://www.ams.org.cn/EN/Y2004/V40/I6/579

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