Microstructure and Mechanical Properties of 4Cr5MoSiV1 Steel Fabricated via Selective Laser Melting Post Tempering

Fig. 3. Microstructures of samples. (a) Untreated; (b) 200 ℃/2 h; (c) 400 ℃/2 h; (d) 450 ℃/2 h; (e) 550 ℃/2 h;(f) 600 ℃/2 h; (g) 550 ℃/2 h+550 ℃/2 h; (h) 600 ℃/2 h+600 ℃/2 h

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Fig. 4. Average microhardness of samples

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Fig. 5. Variation curves of ultimate tensile strength and elongation of samples

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Fig. 6. Fracture morphologies of samples. (a) Untreated; (b) 200 ℃/2 h; (c) 400 ℃/2 h; (d) 450 ℃/2 h;(e) 550 ℃/2 h; (f) 600 ℃/2 h; (g) 550 ℃/2 h+550 ℃/2 h; (h) 600 ℃/2 h+600 ℃/2 h

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$Dimple morphologies of tensile fractures of samples. (a) 550 ℃/2 h; (b) 600 ℃/2 h; (c) 550 ℃/2 h+550 ℃/2 h; (d) 600 ℃/2 h+600 ℃/2 h$

Fig. 7. Dimple morphologies of tensile fractures of samples. (a) 550 ℃/2 h; (b) 600 ℃/2 h; (c) 550 ℃/2 h+550 ℃/2 h; (d) 600 ℃/2 h+600 ℃/2 h

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Table 1. Chemical composition of 4Cr5MoSiV1 steel powder
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Table 1. Chemical composition of 4Cr5MoSiV1 steel powder
Element C V Mo Ni Si Cr Mn P S Fe
Mass fraction /% 0.39 1.05 1.27 0.23 0.87 5.24 0.48 0.019 0.01 Bal.

Table 2. Heat treatment parameters for 4Cr5MoSiV1 steel samples fabricated by SLM
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Table 2. Heat treatment parameters for 4Cr5MoSiV1 steel samples fabricated by SLM
Sample No. Heat treatment condition
1 Untreated
2 200 ℃/2 h/FC
3 400 ℃/2 h/FC
4 450 ℃/2 h/FC
5 550 ℃/2 h/FC
6 600 ℃/2 h/FC
7 550 ℃/2 h/FC+550 ℃/2 h/FC
8 600 ℃/2 h/FC+600 ℃/2 h/FC

Table 3. Phase compositions of samples
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Table 3. Phase compositions of samples
Phase Mass fraction /%
Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 Sample 6 Sample 7 Sample 8
α-Fe 99.067 99.186 99.518 99.570 99.716 100 99.876 100
γ-Fe 0.933 0.814 0.482 0.430 0.284 0 0.124 0

Table 4. FWHM and 2θ of α-Fe phase of each sample
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Table 4. FWHM and 2θ of α-Fe phase of each sample
Sample No. 1 2 3 4 5 6 7 8
2θ /(°) 52.155 52.209 52.235 52.266 52.286 52.288 52.338 52.341
w_1/2 0.740 0.542 0.526 0.524 0.512 0.500 0.503 0.382

Table 5. Grain sizes of samples
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Table 5. Grain sizes of samples
Sample No. 1 2 3 4 5 6 7 8
Grain size d /μm 1.14 1.34 1.51 1.68 1.70 1.81 1.79 2.06

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Shuai Chen, Fenghe Tao, Changzhi Jia. Microstructure and Mechanical Properties of 4Cr5MoSiV1 Steel Fabricated via Selective Laser Melting Post Tempering[J]. Chinese Journal of Lasers, 2019, 46(10): 1002005

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