Microstructure and Micro-hardness of 4Cr5MoSiV1 Die Steels Fabricated by Selective Laser Melting

Fig. 2. Microstructures of samples at η=905 J·m-1. (a) XOZ section magnified by 3500 times; (b) XOZ section magnified by 10000 times; (c) XOY section magnified by 5000 times

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Fig. 3. Microstructures in central zone of molten pool under different η. (a) 835 J·m-1;(b) 864 J·m-1; (c) 905 J·m-1; (d) 950 J·m-1

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Fig. 4. Microstructures of particles. (a) Spatter particles; (b) black smoke particles

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Fig. 5. XRD patterns of samples under different η

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Fig. 6. Surface pores of sample at η=835 J·m-1. (a) 1500 times; (b) 20000 times

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Fig. 7. Surface crack of sample at η=950 J·m-1. (a) 800 times; (b) 5000 times

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Fig. 8. Micro-hardness in different zones of sample. (a) Central zone of molten pool; (b) transition zone

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Fig. 9. Average micro-hardness of sample. (a) Central zone of molten pool; (b) transition zone

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Table 1. Chemical compositions of 4Cr5MoSiV1 die steel powder(mass fraction,%)
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Table 1. Chemical compositions of 4Cr5MoSiV1 die steel powder(mass fraction,%)
Element C V Mo Ni Si Cr Mn P S Fe
Content 0.39 1.05 1.27 0.23 0.87 5.24 0.48 0.019 0.01 Balance

Table 2. Grain sizes in different zones of molten pool
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Table 2. Grain sizes in different zones of molten pool
η /(J·m^-1) Grain size d /μm
Centralzone Transitionzone Heataffected zone
835 1.00 0.45 2.09
864 1.19 0.69 2.61
905 1.32 0.78 2.81
950 2.38 0.99 3.56

Table 3. EDS results in different zones of molten pool (mass fraction,%)

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Table 3. EDS results in different zones of molten pool (mass fraction,%)

Element	Central zone		Heat affected zone		Transition zone
Element	Grain	Boundary	Grain	Boundary	Grain	Boundary
C	1.77	2.35	1.43	1.70	2.01	2.76
V	1.15	1.35	1.22	1.14	1.25	1.39
Mo	0.97	1.87	0.99	1.20	1.45	1.89
Ni	0.48	0.40	0.58	0.52	0.39	0.36
Si	0.73	0.82	0.75	0.80	0.77	0.86
Cr	5.14	5.94	5.49	5.52	5.62	5.58
Mn	0.25	0.40	0.26	0.35	0.24	0.32
Fe	89.51	86.87	89.28	88.77	88.27	86.84

Table 4. Chemical compositions of spatter particles (mass fraction, %)
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Table 4. Chemical compositions of spatter particles (mass fraction, %)
Spot C V O Si Cr Fe
1 4.55 1.04 3.82 0.71 4.97 84.91

Table 5. Chemical compositions of black smoke particles (mass fraction, %)
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Table 5. Chemical compositions of black smoke particles (mass fraction, %)
Spot C Mn O Ni Cr Fe
1 42.62 1.05 26.45 0 2.08 27.80
2 11.15 1.88 21.25 0.74 5.82 59.16

Table 6. Phase compositions of samples (mass fraction, %)
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Table 6. Phase compositions of samples (mass fraction, %)
η /(J·m^-1) Martensite Austenite
950 99.08 0.92
905 99.31 0.69
864 99.52 0.48
835 99.72 0.28

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Chen Shuai, Tao Fenghe, Jia Changzhi. Microstructure and Micro-hardness of 4Cr5MoSiV1 Die Steels Fabricated by Selective Laser Melting[J]. Chinese Journal of Lasers, 2019, 46(1): 102007

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