FORMATION OF PREVIOUS PARTICLE BOUNDARY OF NICKEL BASE PM SUPERALLOY FGH96

MA Wenbin; LIU Guoquan; HU Benfu; JIA Chengchang

doi:10.3724/SP.J.1037.2013.00125

Acta Metall Sin >

2013 , Vol. 49 >Issue 10: 1248 - 1254

DOI: https://doi.org/10.3724/SP.J.1037.2013.00125

FORMATION OF PREVIOUS PARTICLE BOUNDARY OF NICKEL BASE PM SUPERALLOY FGH96

MA Wenbin ,
LIU Guoquan ,
HU Benfu ,
JIA Chengchang

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1) School of Materials Science and Engineering, University of Science and Technology Beijing, Bejing 100083
2) State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing,Beijing 100083

Received date: 2013-03-20

Revised date: 2013-07-16

Online published: 2013-10-11

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Abstract

The previous particle boundaries (PPB) introduced in the PM (powder metallurgy) superalloys during their fabrication process are deleterious to the mechanical properties of the superalloys. The elimination and the minimization of the PPB are the keys to promote the metallurgical quality of the PM superalloys. The carbon replica methods and advanced analytic techniques were utilized to study the PPB formed in FGH96 alloy. The result shows that the multi--element carbides and largeγ′ phase decorate the outline of the PPB. The PPB precipitates in the alloy which is hot isostatic pressed (HIPed) below the solution temperature of theγ′phase are mainlyγ′ phase and MC (the metalic elements are mainly Ti,Nb and Zr), while those in the alloy HIPed above the temperature are MC.The supersaterated solutes on the powder surface react with the carbon andoxygen of the surface during the HIP process, which leads to theformation of the PPB precipitates. Besides, the segregation of the MC andγ′ phase forming elements speed up the reaction above. The characteristics and the elements segregation of the initial powder surface inevitably lead to the formation of PPB and, as a result, the PPB can not be completely eliminated. Selecting proper size range of the initial powders for HIP and strict controls of the HIP parameters are the key tominimizing the PPB.

Key words： powder matallurgy superalloy; γ′ phase; MC carbide; HIP

Cite this article

MA Wenbin , LIU Guoquan , HU Benfu , JIA Chengchang . FORMATION OF PREVIOUS PARTICLE BOUNDARY OF NICKEL BASE PM SUPERALLOY FGH96[J]. Acta Metall Sin, 2013 , 49(10) : 1248 -1254 . DOI: 10.3724/SP.J.1037.2013.00125

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