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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2012, Vol. ›› Issue (6): 1156-1162.

• Material Engineering and Mechanical Manufacturing • Previous Articles    

Influence of Aging Treatment on Microstructure and Properties of Cold-drawn Alloy GH350

LI Kemin, HAN Guangwei, DENG Bo   

  1. Department of High Temperature Materials Research, Central Iron and Steel Research Institute, Beijing 100081, China
  • Received:2011-09-01 Revised:2011-11-14 Online:2012-06-25 Published:2012-06-26
  • Supported by:

    National Military Project

Abstract: The influence of aging treatment on the precipitation behavior of η-Ni3Ti phase and high temperature tensile properties for cold-drawn alloy GH350 (AEREX350) is investigated by means of optical microscopy,scanning electron microscopy(SEM)and 730 ℃ tensile tests. It is found that η phase appears at grain boundaries or grain interiors during 780-1 060 ℃ aging in cold-drawn alloy GH350. The precipitation temperature of grain boundary η phase ranges from 780 ℃ to 1 060 ℃,while a Widmanstttan morphology of η phase aligning along (111) crystallographic planes of the matrix is formed at 850 ℃ to 1 060 ℃. Experimental results also show that cold-drawn alloy GH350 begins to recrystallize at 980 ℃,and has a complete recrystallization at 1 010 ℃. 730 ℃ tensile tests of cold-drawn alloy GH350 after a two-stage aging show that high temperature ductility of the alloy is improved,while the strength decreases with increase of the first stage aging temperature.

Key words: superalloys, &eta, phase, recrystallization, aging, high temperature tensile test, AEREX350 alloy

CLC Number: