Phase Transformation during Metling and Solidifying Process of Homogenized Superalloy GH3625

doi:10.11901/1005.3093.2016.624

Chinese Journal of Materials Research

2017, Vol. 31

Issue (11): 853-859 DOI: 10.11901/1005.3093.2016.624

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Phase Transformation during Metling and Solidifying Process of Homogenized Superalloy GH3625

Yutian DING, Zhengyi DOU(

), Yubi GAO, Xin GAO, Haifeng LI, Dexue LIU

State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals, Lanzhou University of Technology, Lanzhou 730050, China

Cite this article:

Yutian DING, Zhengyi DOU, Yubi GAO, Xin GAO, Haifeng LI, Dexue LIU. Phase Transformation during Metling and Solidifying Process of Homogenized Superalloy GH3625. Chinese Journal of Materials Research, 2017, 31(11): 853-859.

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Abstract

The microstructure evolution, and the dissolution and precipitation of the main phase of the homogenized superalloy GH3625 during melting and solidifying process were investigated by means of differential scanning calorimetry (DSC), confocal laser scanning microscopy (CLSM), scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The results show that the twostep homogenization process is effective for eliminating the laves phase of low-melting point and the segregation in micro-scale for alloying elements of the superalloy GH3625; The initial melting temperature of the homogenized superalloy GH3625 is obviously improved, and the melting occurs firstly in the regions such as grain boundary, surface, shrinkage cavity and carbide (NbC) etc.. The solidification process of the alloy GH3625 can be divided into three stages, and which correspond to mainly the crystallization reactions such as L→γ, L→γ+MC and L→γ+laves. The nucleation of γ phase belong to heterogeneous nucleation, so that solute atoms easily segregate at grain boundaries, which in the dendrites inevitably formed elemental segregation and phase segregation. The precipitation type of the low melting point laves phase is mainly related to the cooling rates.

Key words: metallic materials superalloy GH3625 confocal laser scanning microscopy homogenized melting solidification

Received: 25 October 2016

Fund: Supported by National Natural Science Foundation of China (No. 51661019) and Major Science and Technology Projects in Gansu Province (No. 145RTSA004)

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	Yutian DING
	Zhengyi DOU
	Yubi GAO
	Xin GAO
	Haifeng LI
	Dexue LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2016.624 OR https://www.cjmr.org/EN/Y2017/V31/I11/853

Table 1 Chemical composition of GH3625 alloy ingot (mass fraction, %)

Fig.1 Structure of GH3625 superalloy before and after homogenization (a) as-cast structure, (b) homogenization structure

Table 2 Main elements in the content of different locations (%) and segregation coefficient (K) of GH3625 superalloy ingot

Fig.2 DSC cooling curve of the GH3625 superalloy (a) heating, (b) cooling

Table 3 The reaction temperature of each phase in the solidification process (10 K/min)

Fig.3 Dynamic Solidification Microstructure of before and after the homogenization treatment of GH3625 superalloy (a)、(b)、(c) before the homogenization treatment (d)、(e)、(f) after the homogenization treatment

Fig.4 Fitted curves of liquid fraction as a function of temperature (a) and time (b) of GH3625 superalloy

Fig.5 Solidification microstructure of GH3625 superalloy (a) dendritic structure (OM), (b)、(c) laves phase (SEM)

Table 4 Comparison of parameters of GH3625 superalloy after solidification in two cases

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