Microstructure and Heating Treatment of DZ40M Prepared by Laser Additive Manufacturing

Fig. 1. Deposition state DZ40M. (a) Sample; (b) microstructure perpendicular to scanning direction;(c) microstructure perpendicular to deposition direction

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Fig. 2. BSE images of deposition state DZ40M. (a) 1840 times; (b) 2160 times; (c) 7430 times

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Fig. 3. Microstructure of DZ40M samples under different solid-solution conditions. (a) 1240 ℃; (b) 1260 ℃; (c) 1280 ℃

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Fig. 4. DSC curve of deposition state DZ40M

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Fig. 5. BSE images of DZ40M samples under different solid-solution conditions. (a) 1240 ℃; (b) 1260 ℃; (c)(d) 1280 ℃

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Fig. 6. BSE images of DZ40M samples under different aging conditions. (a)~(c) 950 ℃; (d)~(f) 1020 ℃

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Table 1. Chemical compositions of DZ40M alloy powder (mass fraction, %)
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Table 1. Chemical compositions of DZ40M alloy powder (mass fraction, %)
Element C Cr Ni W Al Ta Mo Ti Zr B Si Mn P S Co
Content 0.47 25.26 10.57 7.67 0.91 0.37 0.23 0.20 0.15 0.013 0.10 0.10 0.005 0.0013 Bal.

Table 2. Results of EDS for deposition state DZ40M (atom fraction, %)
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Table 2. Results of EDS for deposition state DZ40M (atom fraction, %)
Speculated substances C Ti Cr Co Ni Zr Ta W
M₂₃C₆ 48.04 0.18 26.63 18.94 3.08 0.19 0 2.7
M₇C₃ 53.13 2.33 10.86 20.73 3.67 5.14 1.14 2.47
MC 55.98 4.01 19.71 9.66 1.59 2.96 2.25 3.85

Table 3. Results of EDS for DZ40M samples under different solid-solution conditions (atom fraction, %)

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Table 3. Results of EDS for DZ40M samples under different solid-solution conditions (atom fraction, %)

Solid-solutiontemperature /℃	Speculatedsubstances	C	Ti	Cr	Co	Ni	Zr	Ta	W
1240	MC	73.96	10.43	2.43	1.99	0.4	2.6	6.33	1.84
1260	MC	57.03	10.15	3.72	5.35	0.89	11.46	9.25	2.15
	M₂₃C₆	46.57	0.3	34.92	13.18	1.76	0	0	3.23
	M₇C₃/M₃C₂	36.41	0.32	22.61	31.66	5.15	0	0	3.86
1280	M₆C	42.5	0	19.46	27.14	3.76	0	0	7.13
	MC	66.43	12.51	1.89	1.73	0	5.89	7.45	4.11

Table 4. Static tensile properties of DZ40M samples under different conditions

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Table 4. Static tensile properties of DZ40M samples under different conditions

State	Tensile temperature /℃	Ultimate tensile strength /MPa	Elongation /%
Laser deposition	Room-temperature	893±26	24.8±7.7
	900	345±6	71.5±5.5
1280 ℃/4 h+950 ℃/12 h	Room-temperature	1030±15	12.5±0.5
	900	343±8	60.5±6.5
1280 ℃/4 h+1020 ℃/12 h	Room-temperature	1003±34	24.5±1.3
	900	298±8	56.0±12.0
As cast	Room-temperature ^[17]	775	40
	900 ^[18]	305	95

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Meng Xiang, Tian Xiangjun, Cheng Xu, Tang Haibo. Microstructure and Heating Treatment of DZ40M Prepared by Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2018, 45(10): 1002008

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