Influence of Si Content on Microstructures and Stress Rupture Properties of Hastelloy X Alloy Formed by Selective Laser Melting

Fig. 2. SEM images of SLM-formed Hastelloy X alloy samples. (a) Batch A alloy before stress rupture test; (b) batch A alloy after stress rupture test; (c) batch B alloy before stress rupture test; (d) batch B alloy before stress rupture test

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Fig. 3. EDS spectra of Hastelloy X alloy precipitates at grain boundary. (a)(b) Before stress rupture test, batch A alloy; (c)(d) after stress rupture test, batch A alloy; (e)(f) before stress rupture test, batch B alloy; (g)(h) after stress rupture test, batch B alloy

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Fig. 4. EDS images of batch B alloy after stress rupture test

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$TEM images of batch B alloy after stress rupture test. (a) Precipitates; (b) substrate SAED pattern; (c) substrate and precipitate diffraction patterns$

Fig. 5. TEM images of batch B alloy after stress rupture test. (a) Precipitates; (b) substrate SAED pattern; (c) substrate and precipitate diffraction patterns

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$SEM images of stress rupture fractures of SLM formed Hastelloy X alloy samples under 815 ℃. (a)(b) Batch A alloy; (c)(d) batch B alloy$

Fig. 6. SEM images of stress rupture fractures of SLM formed Hastelloy X alloy samples under 815 ℃. (a)(b) Batch A alloy; (c)(d) batch B alloy

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Table 1. Chemical compositions of Hastelloy X alloy powder (mass fraction, %)

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Table 1. Chemical compositions of Hastelloy X alloy powder (mass fraction, %)

Element	Ni	Cr	Fe	Mo	Co	W	Si	Mn	C	S	Ti
Batch A	Bal.	21.560	18.510	9.110	1.570	0.610	0.071	0.016	0.081	0.002	0.003
Batch B	Bal.	21.380	18.530	9.160	1.590	0.610	0.365	0.014	0.077	0.002	0.003
Standard requirement	Bal.	20.500‒23.000	17.000‒20.000	8.000‒10.000	0.500‒2.500	0.200‒1.000	≤1.000	≤1.000	0.050‒0.150	≤0.003	-

Table 2. Process parameters for SLM forming of Hastelloy X
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Table 2. Process parameters for SLM forming of Hastelloy X
Layer thickness /μm Spot diameter /μm Hatchspacing /μm Preheating temperature /℃ Laserpower /W Scan speed /(mm^-1·s) Rotation angle of laser scanning direction /(°)
20 100 90 80 200 1100 67

Table 3. Stress rupture properties of SLM formed Hastelloy X alloy samples under 815 ℃/105 MPa
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Table 3. Stress rupture properties of SLM formed Hastelloy X alloy samples under 815 ℃/105 MPa
Alloy Time /h Elongation /%
Batch A alloy 29.1 13.0
Batch B alloy 34.8 6.4
Forging standard requirement ≥24 ≥10

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Yali Li, Yanli He, Jun Fu, Jianfeng Zhang. Influence of Si Content on Microstructures and Stress Rupture Properties of Hastelloy X Alloy Formed by Selective Laser Melting[J]. Chinese Journal of Lasers, 2024, 51(20): 2002307

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