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Acta Metall Sin    DOI: 10.11900/0412.1961.2015.00358
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STUDY ON THE PRECIPITATION AND DISSOLUTION OF SIGMA PHASE IN A HOT CORROSION RESISTANCE CAST NICKLE BASED SUPERALLOY
Jian-Ting GUOChao YUAN2, 2
 
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Abstract  The experimental alloy is designed and employed in high-performance industrial gas turbines as low-pressure turbine blades, working in temperature range of 750 - 900 °C, The alloy contains high levels of refractory elements in order to increase the high-temperature mechanical properties, however, this can make the alloy prone to the formation of σ phase during service, which could deteriorate the properties further if the fraction of σ phase exceeds the safety allowances. In this study, the formation of sigma phase (σ) during long-term thermal exposure, dissolution of the sigma phase during rejuvenation process, and their influence on stress-rupture properties of a hot-corrosion resistant nickel based superalloy have been investigated.During long-term thermal exposure at 800-900 °C for up to 1×104 hours, the σ phase formation is mainly in dendrite cores with a few at interdendritic regions. As the aging temperature increases, formation rate of σ increases and the incubation time for σ nucleation decreases. From the kinetic analysis, the σ phases form firstly in the vicinity or on the M23C6 that locate in dendrite cores, with the strong segregation of W, Cr and Co contributing to this process. The calculated activation energies of σ formation show that the early stage is related to Co and Cr diffusion and the steady stage is related to Mo diffusion. During solid solution process at 1000-1170℃, the σ phases that precipitated during long-term thermal exposure dissolves to γ matrix. The higher the solid solution temperature is, the fast the sigma phase dissolves. Moreover, the sigma phase does not embrittle the alloy. The reheat treatment of the alloy leads to the dissolution of precipitated sigma phases and further prolongs the stress-rupture life efficiently.
Received:  07 July 2015     
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Jian-Ting GUO Chao YUAN. STUDY ON THE PRECIPITATION AND DISSOLUTION OF SIGMA PHASE IN A HOT CORROSION RESISTANCE CAST NICKLE BASED SUPERALLOY. Acta Metall Sin, 0, (): 0-0.

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https://www.ams.org.cn/EN/10.11900/0412.1961.2015.00358     OR     https://www.ams.org.cn/EN/Y0/V/I/0

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