Long-Time Thermal Exposure Microstructures and Performance Evolution Law of Selective Laser Melting IN625 Nickel-Based Superalloy

Zhenfeng Song; Shuang Gao; Bo He; Liang Lan; Jiang Wang; Jieshan Hou

doi:10.3788/CJL202249.1402807

Chinese Journal of Lasers, Volume. 49, Issue 14, 1402807(2022)

Long-Time Thermal Exposure Microstructures and Performance Evolution Law of Selective Laser Melting IN625 Nickel-Based Superalloy

Zhenfeng Song¹, Shuang Gao^1,2、*, Bo He¹, Liang Lan¹, Jiang Wang², and Jieshan Hou³

Author Affiliations

¹Research Center of High-Temperature Alloy Precision Forming , School of Material Engineering, Shanghai University of Engineering Science, Shanghai 201620, China

²State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China

³Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, China

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Figures & Tables(12)

Fig. 1. Schematic of SLM IN625 sample orientation and tensile sample size

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Fig. 2. Phase diagrams of IN625 alloy calculated by thermodynamic software. (a) Equilibrium phase diagram; (b) partial enlargement of equilibrium phase diagram; (c) 700 ℃ isothermal transformation phase diagram

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Fig. 3. SEM images and EDS analysis result of SLM IN625 alloy. (a) As-built microstructure; (b) solution-treated microstructure; (c) high magnification image of part indicated by white frame in Fig.3(a); (d) EDS analysis result

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Fig. 4. OM images of thermal exposure microstructures of as-bulit and solution-treated SLM IN625 alloys

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Fig. 5. SEM images of thermal exposure microstructures of as-bulit and solution-treated SLM IN625 alloys

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Fig. 6. Relationship between average size of δ phase and thermal exposure holding time at 700 ℃

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Fig. 7. Tensile properties of SLM IN625 alloy at room temperature. (a) Ultimate tensile strength; (b) yield strength；(c) elongation

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Fig. 8. Microstructural evolution mechanism model of SLM IN625 nickel-base superalloy after long-term aging

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Table 1. Chemical compositions of IN625 alloy (mass fraction, %)
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Table 1. Chemical compositions of IN625 alloy (mass fraction, %)
Element Cu Ta Mg P S Ca Si O N B
Content 0.020 0.010 <0.010 <0.010 <0.010 <0.010 0.060 0.016 0.007 <0.006

Table 2. Heat treatment regime
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Table 2. Heat treatment regime
Sample Solution treatment Long-term aging treatment
AB 700 ℃/500 h, 1000 h, 3000 h/WC
ST 1200 ℃/1 h/WC 700 ℃/500 h, 1000 h, 3000 h/WC

Table 3. EDS composition analysis of precipitated phase at grain boundary in thermal exposure microstructure

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Table 3. EDS composition analysis of precipitated phase at grain boundary in thermal exposure microstructure

Spectrum No.	Content	Ni	Cr	Mo	Nb	Fe	Ti	Al	Si
Spectrum 1	Mass fraction /%	59.29	13.44	11.75	14.58	0.03	0.25	0.33	0.33
Spectrum 1	Atomic fraction /%	64.01	16.38	7.76	9.95	0.03	0.33	0.79	0.76
Spectrum 2	Mass fraction /%	54.06	24.76	13.94	6.27	0.09	0.58	0.29	0
Spectrum 2	Atomic fraction /%	56.34	29.13	8.89	4.13	0.1	0.74	0.65	0

Table 4. Average size and coarse rate of δ phase of SLM IN625 alloy after long-term thermal exposure
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Table 4. Average size and coarse rate of δ phase of SLM IN625 alloy after long-term thermal exposure
Sample No. Average size /μm Coarse rate /(μm³·h^－1)
Aging time of 500 h Aging time of 1000 h Aging time of 3000 h
ST 1.17 2.59 7.22×10^－3
AB 0.85 1.33 1.88 2.34×10^－3

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Zhenfeng Song, Shuang Gao, Bo He, Liang Lan, Jiang Wang, Jieshan Hou. Long-Time Thermal Exposure Microstructures and Performance Evolution Law of Selective Laser Melting IN625 Nickel-Based Superalloy[J]. Chinese Journal of Lasers, 2022, 49(14): 1402807

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Paper Information

Received: Dec. 21, 2021

Accepted: Feb. 11, 2022

Published Online: Jun. 14, 2022

The Author Email: Gao Shuang (gaoshuang_alloy@163.com)

DOI:10.3788/CJL202249.1402807

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical compositions of IN625 alloy (mass fraction, %)

Table 1. Chemical compositions of IN625 alloy (mass fraction, %)

Table 2. Heat treatment regime

Table 2. Heat treatment regime

Table 3. EDS composition analysis of precipitated phase at grain boundary in thermal exposure microstructure

Table 3. EDS composition analysis of precipitated phase at grain boundary in thermal exposure microstructure

Table 4. Average size and coarse rate of δ phase of SLM IN625 alloy after long-term thermal exposure

Table 4. Average size and coarse rate of δ phase of SLM IN625 alloy after long-term thermal exposure