RESEARCH AND DEVELOPMENT OF &gamma;&acute;&acute; AND &gamma;&acute; STRENGTHENED Ni-Fe BASE SUPERALLOY GH4169

XIE Ti-Shan; DONG Jian-Xin; FU Shu-Hong; ZHANG Mai-Cang

doi:10.3724/SP.J.1037.2010.00436

Acta Metall Sin >

2010 , Vol. 46 >Issue 11: 1289 - 1302

DOI: https://doi.org/10.3724/SP.J.1037.2010.00436

论文

RESEARCH AND DEVELOPMENT OF γ´´ AND γ´ STRENGTHENED Ni-Fe BASE SUPERALLOY GH4169

XIE Ti-Shan ,
DONG Jian-Xin ,
FU Shu-Hong ,
ZHANG Mai-Cang

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1) High Temperature Materials Research Laboratories, School of Materials Science and Technology, University of Science and Technology Beijing, Beijing 100083
2) National Key Laboratory of Science and Technology on Advanced High Temperature Structural Materials, Beijing Institute of Aeronautical Materials, Beijing 100095

Received date: 2010-08-30

Revised date: 2010-09-28

Online published: 2010-11-11

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Abstract

γ´´ and γ´ strengthened Ni-Fe base superalloy Inconel 718 (GH4169) is world-widely used under 650 ℃ because of its excellent mechanical properties and metallurgical workability. The effects of main strengthening elements Nb, Ti, Al, minor elements P, S and micro-alloying element Mg on mechanical properties and structure stability have been studied for this alloy at standard heat treatment and long time aging conditions both by means of mechanical tests (tensile, stress rupture and creep, cyclic stress rupture and crack propagation etc.) and detail structure analyses (SEM, TEM, EDS, SAED, phase separation and micro-chemical analyses etc.) and also Auger analyses on grain boundary segregation behavior. For quality improvement of conventional GH4169, Nb content should be controlled at high level (5.4%-5.5%) with low content of S (<10×10^-6) and high level of P (but less than 150×10^-6) and with micro-alloying element Mg also. For 680 ℃ even higher temperature used modified GH4169 the γ´´/γ´ highest stable temperature must be raised and the grain boundary precipitates should be controlled. Nb content should be still controlled at high level (5.4%-5.5%), Al content should be raised to 1.0%-1.5% and Ti content still be kept at 1%; S must be controlled to less than 10×10^-6 and P should be raised to a high level but less than 150×10^-6and also with micro-alloying element Mg. The modified GH4169 to be used at 680 ℃ or even higher temperature has good thermal structure stability and high mechanical properties above 650 ℃.

Key words： Ni-Fe base superalloy; structure stability; modification; minor element

Cite this article

XIE Ti-Shan , DONG Jian-Xin , FU Shu-Hong , ZHANG Mai-Cang . RESEARCH AND DEVELOPMENT OF γ´´ AND γ´ STRENGTHENED Ni-Fe BASE SUPERALLOY GH4169[J]. Acta Metall Sin, 2010 , 46(11) : 1289 -1302 . DOI: 10.3724/SP.J.1037.2010.00436

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