Hongwei Kang, Zhihong Dong, Wei Zhang, Yujiang Xie, Changtai Chi, Xiao Peng. Effect of Isothermal Quenching on Microstructure and Tensile Properties of 12CrNi2 Alloy Steel Prepared by Laser Additive Manufacturing[J]. Laser & Optoelectronics Progress, 2020, 57(9): 091403
- Laser & Optoelectronics Progress
- Vol. 57, Issue 9, 091403 (2020)
Fig. 1. Surface morphology of 12CrNi2 alloy steel powder
Fig. 2. Heat treatment procedure for the LAM 12CrNi2 alloy steel
Fig. 3. Schematic of tensile sample
Fig. 4. Microstructure of the as-deposited LAM 12CrNi2 alloy steel. (a) Low magnification of OM image; (b) magnified OM image inserted with high-magnification SEM image
Fig. 5. Microstructure of LAM 12CrNi2 alloy steel after isothermal quenching at 200-400 ℃ for different time
Fig. 6. SEM images of LAM 12CrNi2 alloy steel after isothermal quenching at 200 ℃. (a) 5 s; (b) 20 s
Fig. 7. TEM images of LAM alloy steel isothermal quenching at temperature 200 ℃ for 20 s. (a) Bright-field image; (b) selected-area electron diffraction patterns of area 1; (c) selected-area electron diffraction patterns of area 2
Fig. 8. Stress-strain curves of samples before and after isothermal quenching
Fig. 9. Tensile fracture morphologies of LAM steel before and after heat treatment. (a)-(c) As-deposited state; (d)(e) 860 ℃/30 min+200 ℃/10 s; (f)(g) 860 ℃/30 min+200 ℃/20 s; (h)(i) 860 ℃/30 min+400 ℃/20 s
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Table 1. Results of tensile test of before and after heat treatment of LAM samples
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