Author Affiliations
1Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China2PLA 4724 Plant, Shanghai 200436, Chinashow less
Fig. 1. Morphology and size of 30CrMnSiA alloy powders. (a) SEM morphology; (b) particle size distribution
Fig. 2. Schematics of laser-cladding and sampling of mechanical properties test samples. (a) Substrate with notch for lase cladding; (b) diagram of laser-cladding; (c) laser scanning pattern; (d) sampling method of mechanical properties test samples
Fig. 3. Schematics of tensile samples and impact samples. (a) Impact sample; (b) tensile sample
Fig. 4. Cross-section macroscopic morphology of two high-strength steels after multi-layer laser-cladding. (a) 30CrMnSiA substrate; (b) HAZ on 30CrMnSiA substrate; (c) 30CrMnSiNi2A substrate; (d) HAZ on 30CrMnSiNi2A substrate
Fig. 5. Microstructures of two high-strength steel substrates and HAZ. (a) 30CrMnSiA substrate; (b) HAZ on 30CrMnSiA substrate; (c) 30CrMnSiNi2A substrate; (d) HAZ on 30CrMnSiNi2A substrate
Fig. 6. Microstructures of different cladding layers on 30CrMnSiA substrate. (a) The first layer; (b) the second layer; (c) the third layer; (d) the fourth layer; (e) the fifth layer; (f) the sixth layer (cap layer)
Fig. 7. Microstructures of different cladding layers on 30CrMnSiNi2A substrate. (a) The first layer; (b) the second layer; (c) the third layer; (d) the fourth layer; (e) the fifth layer; (f) the sixth layer (cap layer)
Fig. 8. Metallography image and microhardness distribution in cross-section of cladding samples on two high strength steel substrates. (a) 30CrMnSiA, metallography image; (b) 30CrMnSiNi2A, metallography image; (c) 30CrMnSiA, microhardness distribution; (d) 30CrMnSiNi2A, microhardness distribution
Fig. 9. Mechanical properties of two substrates and cladding samples at room-temperature. (a) Impact toughness; (b) tensile property
Fig. 10. Impact fracture morphologies of cladding samples on different substrates. (a)(c) Fracture of cladding sample on 30CrMnSiA substrate and partially enlarged crack source; (c)(d) fracture of cladding sample on 30CrMnSiNi2A substrate and partially enlarged crack source
Fig. 11. Tensile fracture in cross-section of cladding sample on 30CrMnSiA substrate. (a) Cross-section image; (b)--(d) partially enlarged images
Fig. 12. Tensile fracture in cross-section of cladding sample on 30CrMnSiNi2A substrate. (a) Cross-section image; (b)--(d) partially enlarged images
Element | C | Cr | Mn | Si | Fe |
---|
Mass fraction /% | 0.286 | 0.954 | 1.012 | 0.977 | Bal. |
|
Table 1. Chemical composition of 30CrMnSiA alloy powders