Effect of Leaching Process for Ceramic Core on Micro-structure and Mechanical Property of Investment Cast Co-base Superalloy DZ40M

doi:10.11901/1005.3093.2015.204

Chinese Journal of Materials Research

2016, Vol. 30

Issue (2): 141-148 DOI: 10.11901/1005.3093.2015.204

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Effect of Leaching Process for Ceramic Core on Micro-structure and Mechanical Property of Investment Cast Co-base Superalloy DZ40M

TONG Jian¹, CHEN Jiaqi², ZHENG Zhi¹, YU Yongsi³, NING Likui¹, LIU Enze^1,^*(

)

1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. Representative Office of PLA in 430, Xi'an 710021, China
3. School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024, China

Cite this article:

TONG Jian, CHEN Jiaqi, ZHENG Zhi, YU Yongsi, NING Likui, LIU Enze. Effect of Leaching Process for Ceramic Core on Micro-structure and Mechanical Property of Investment Cast Co-base Superalloy DZ40M. Chinese Journal of Materials Research, 2016, 30(2): 141-148.

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Abstract

Effect of the leaching process of SiO₂- and Al₂O₃-based ceramic core on the microstructure and mechanical property of the investment cast Co-based superalloy DZ40M is investigated. It is shown that after immersion in the leaching medium for SiO₂-based ceramic core for 24 h, the microstructure and mechanical property of the alloy does not vary evidently; although after immersion in the leaching medium for Al₂O₃-based ceramic core for above 300 h, the microstructure variation of DZ40M alloy is not evident, but its mechanical property decreased remarkably, which may be due to the occurrence of an embrittled layer of about 1 mm in thickness on the alloy surface. The embrittled layer is caused by hydrogen embrittlement resulted from charging hydrogen during immersion in the leaching medium for Al₂O₃-based ceramic core.

Key words: metallic materials DZ40M alloy core leaching technology microstructure mechanical properties hydrogen embrittlement

Received: 13 April 2015

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	Jian TONG
	Jiaqi CHEN
	Zhi ZHENG
	Yongsi YU
	Likui NING
	Enze LIU

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https://www.cjmr.org/EN/10.11901/1005.3093.2015.204 OR https://www.cjmr.org/EN/Y2016/V30/I2/141

Fig.1 Microstructure of DZ40M alloy as-cast

Fig.2 Microstructure of DZ40M alloy immersed in Si-based core leaching medium for 24 h

Fig.3 Microstructure of DZ40M alloy surface immersed in Si-based core leaching medium for 24 h

Fig.4 XRD spectra of DZ40M alloy surface immersed in Si-based core leaching medium for 24 h

Table 1 Tensile properties of DZ40M alloy immersed in Si-based core leaching medium for different times

Fig.5 Macro (a, b) and micro (c, d) fractures of tensile-fractured specimen of DZ40M alloy at room temperature, (a, c) as-cast, (b, d) immersed Si-based core leaching medium for 24 h

Table 2 Rupture properties of DZ40M alloy immersed in Si-based core leaching medium for different time and the test condition is 980℃ and 83 MPa

Fig.6 High magnification fractograph of tensile-fractured specimen of DZ40M alloy immersed in Si-based core leaching medium for 24 h

Fig.7 Macro (a, b) and micro (c, d) fractures of rupture-fractured specimen of DZ40M alloy at 980℃ and 83 MPa, (a, c) as-cast, (b, d) immersed Si-based core leaching medium for 24 h

Fig.8 Microstructure of DZ40M alloy immersed in Al-based core leaching medium with the leaching time 300 h (a) and 600 h (b)

Fig.9 Microstructure near surface of specimen immersed in Al-based core leaching medium for 600 h

Fig.10 Surface XRD spectra of specimen immersed in Al-based core leaching medium

Table 3 EDS analysis result of surface corrosion products of specimen immersed in Al-based core leaching medium for 600 h (%, atomic fraction)

Fig.11 Fractographs of tensile-fractured specimen of DZ40M alloy at room temperature after Al-based core leaching for 300 h (a-c) and 600 h (d-f), (a, d) macro fracture, (b, e) micro fracture, (c, f) center of fracture surface

Fig.12 Microstructure of longitudinally sectioned tensile specimen immersed in Al-based core leaching medium for 600 h, (a) fracture surface, (b-d) cracks

Table 4 Rupture properties of DZ40M alloy immersed in Al-based core leaching medium for different time and the test condition is 980℃/83 MPa

Fig.13 Fractographs of rupture-fractured specimen of DZ40M alloy at 980℃/83MPa after Al-based core leaching for 300 h (a-c) and 600 h (d-f), (a, d) macro fracture, (b, f) center of fracture, (c) surface layer of fracture, (e) outer area of fracture

Table 5 Effect of core leaching technology on the average hydrogen content of DZ40M alloy

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	(海潮,硅基陶瓷型芯脱芯工艺, 中国精铸第十届年会论文集, 2007)p. 252-256)
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	(李林, 刘建平, 铝基型芯剂的研究及在航空发动机叶片制造中的应用, 航空材料学报, 1(s), 282(2003))
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