Effect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169

doi:10.11901/1005.3093.2018.181

Chinese Journal of Materials Research

2018, Vol. 32

Issue (12): 936-945 DOI: 10.11901/1005.3093.2018.181

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Effect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169

Xiaoliang LI^1,², Bo CHEN¹(

), Weiwei XING¹, Leilei DING¹, Yingche MA¹, Kui LIU¹

1 ^.Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2 School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China

Cite this article:

Xiaoliang LI, Bo CHEN, Weiwei XING, Leilei DING, Yingche MA, Kui LIU. Effect of Si on Solidification Behavior and Mechanical Property of Superalloy K4169. Chinese Journal of Materials Research, 2018, 32(12): 936-945.

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Abstract

The segregation- and precipitation-behavior of superalloy K4169 with 0.03~0.65% Si (atomic fraction) in the temperature range of 1150℃~1360℃ via thermo-calc simulation and isothermal solidification experiment. Results show that not only the temperature of solidus-liquid will decrease but also the solid-liquid two-phase region will enlarge with the existence of Si. The liquidus temperature of the alloy decreases from 1354℃ to 1343℃ and the solidus temperature drops from 1241℃ to 1212℃ with the increasing of Si content from 0.03% to 0.64%. With the increasing of Si content, the enrichment of Nb and Mo are promoted in the residual liquid phase, resulting in the depletion of Cr and Fe, while the content of Laves phase increases along with the segregation. Different morphologies are delivered of Laves phase due to the different Si contents in the alloy. The reticular Laves phase was obtained with 0.03% and 0.23% Si, while large blocky laves phase was observed with 0.42% and 0.65% Si. Si has almost no effect on the morphology and precipitation temperature of MC carbide. Si not only affects the room temperature performance of the alloy, but also the elevated temperature performance of the alloy. When the Si content increased from 0.03% to 0.65%, both of the creep-rupture life and elongation are decreased obviously. Base on these research results, as an overall consideration, it is rational to control the Si content for K4169 alloy.

Key words: metallic materials K4169 alloy isothermal solidification elemental segregation Laves phase

Received: 08 March 2018

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	Xiaoliang LI
	Bo CHEN
	Weiwei XING
	Leilei DING
	Yingche MA
	Kui LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2018.181 OR https://www.cjmr.org/EN/Y2018/V32/I12/936

Table 1 Chemical composition of alloy K4169 (%, mass fraction)

Fig.1 Calculated solidification sequence of K4169 superalloy with different content of Si predicted by Thermos-Calc (a) 0.03%Si, (b) 0.65%Si

Fig.2 OM of K4169 alloy with different content of Si and different isothermal temperature

Fig.3 Comparison of fraction of residual liquid between (a) isothermal solidification results and (b) calculation

Table 2 Liquidus,solidus and the main phase transformation temperature of K4169 alloys with different Si contents obtained by isothermal solidification experiment and Thermo-Calc simulation (℃)

Table 3 Element segregation analysis of the quenched samples with different isothermal temperatures between solid and liquid phases for different alloys (%, mass fraction)

Fig.4 Eutectic Laves phase precipitated of the 0.03Si alloy at the quenching temperature 1280℃ (a) SEM micrograph; (b) morphology of TEM; (c) selected-area diffraction corresponding and EDS spectrum corresponding (b)

Fig.5 Laves morphologies of samples quenched at different temperatures (a) 0.03%Si at 1120℃, (b) 0.23%Si at 1120℃, (c) 0.42%Si at 1180℃, (d) 0.65%Si at 1190℃

Fig.6 Mass fraction of Laves and MC as a function of Si content at different temperature: (a) Laves, (b) MC

Fig.7 Microstructure of as-cast alloy with different Si (a) 0.03%Si, (b) 0.23%Si, (c) 0.42%Si, (d) 0.65%Si

Fig.8 Effect of Si content on the room temperature yield strength,ultimate tensile strength, elongation and reduction of area (a),and effect of different content of Si on the stress rupture life under 650℃ with 620 MPa (b)

Fig.9 Full view morphologies of fracture surface in tensile test at room temperature with different content of Si: (a) 0.03%Si, (b) 0.23%Si, (c) 0.42%Si and (d) 0.65%Si

Fig.10 Longitudinal section of creep-rupture fracture surface morphologies of samples with the Si content of (a) 0.03%Si, (b) 0.23%Si, (c) 0.42%Si and (d) 0.65%Si

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