1 National Key Laboratory for Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China 2 Hebei Jingjinji Institute of Remanufacturing Industry & Technology, Hejian 062450, Hebei, China 3 National Engineering Research Center for Mechanical Product Remanufacturing, Army Academy of Armored Forces, Beijing 100072, China
Induction cladding TiB/Ti composite coating was in-situ synthesized by induction heating the preplaced powder mixture of 90% Ti (atom fraction, the same below) and 10% boron on a Ti6Al4V substrate. The microstructure, phase composition and micro/nano mechanical properties of the coating were studied by scanning electron microscopy (SEM), energy dispersive spectrometry (EDS), X-ray diffraction (XRD), microhardness tester and nanoindentation tester. The results indicate that the composite coating has a smooth surface and a dense microstructure without cracks and pores. A strong metallurgical adherence is formed between the coating and the substrate. During induction cladding process, B and Ti are fully reacted to in-situ form TiB reinforcements. The matrix of the coating consists of α-Ti phase and a few β-Ti phases. The reinforcements of in-situ synthesized TiB are uniformly distributed in the coating with a volume fraction about of 9.4%. Indentation hardness and modulus of the in-situ TiB particles are about 35 GPa and 545 GPa, respectively, which cause the increase of the microhardness of the composite coating to about 525HV0.2. It is increased by 67% as against the Ti6Al4V substrate.
LI B S , SHANG J L , GUO J J , et al. Microstructure of investment casting in-situ TiB/Ti composites[J]. Chinese Journal of Materials Research, 2005, 19 (4): 375- 381.
WU Y , WANG A H , ZHANG Z . Microstructure, wear resistance and cell proliferation ability of in situ synthesized Ti-B coating produced by laser alloying[J]. Optics and Laser Technology, 2015, 67, 176- 182.
GORSSE S , PETITCORPS L Y , MATAR S , et al. Investigation of the Young's modulus of TiB needles in situ produced in titanium matrix composite[J]. Materials Science and Engineering:A, 2003, 340, 80- 87.
LIN Y H , CHEN Z Y , LI Y H , et al. Microstructure and hardness characteristic of in-situ synthesized TiB coating by laser cladding on TC4 titanium alloy[J]. Infrared and Laser Engineering, 2012, 41 (10): 2694- 2698.
TIAN Y S . Growth mechanism of the tubular TiB crystals in situ formed in the coatings laser-borided on Ti-6Al-4V alloy[J]. Materials Letters, 2010, 64, 2483- 2486.
AN Q , HUANG L J , JIANG S , et al. Microstructure evolution and mechanical properties of TIG cladded TiB reinforced composite coating on Ti-6Al-4V alloy[J]. Vacuum, 2017, 145, 312- 319.
AN Q , HUANG L J , JIAO Y , et al. Intergrowth microstructure and superior wear resistance of (TiB+TiC)/Ti64 hybrid coatings by gas tungsten arc cladding[J]. Materials & Design, 2019, 162, 34- 44.
DAS M , BALLA V K , BASU D . Laser processing of in situ synthesized TiB-TiN-reinforced Ti6Al4V alloy coatings[J]. Scripta Materialia, 2012, 66, 578- 581.
DAS M , BHATTACHARYA K , DITTRICK STANLEY A , et al. In situ synthesized TiB-TiN reinforced Ti6Al4V alloy composite coatings:microstructure, tribological and in-vitro biocompatibility[J]. Journal of the Mechanical Behavior of Biomedical Materials, 2014, 29, 259- 271.
BAO Y , HUANG LJ , AN Q , et al. Wire-feed deposition TiB reinforced Ti composite coating:formation mechanism and tribological properties[J]. Materials Letters, 2018, 229, 221- 224.
BAO Y , HUANG LJ , AN Q , et al. Metal transfer and microstructure evolution during wire-feed deposition of TiB/Ti composite coating[J]. Journal of Materials Processing Technology, 2019, 274, 116298.
CHEN D Q , LIU D , LIU Y F , et al. Microstructure and fretting wear resistance of γ/TiC composite coating in situ fabricated by plasma transferred arc cladding[J]. Surface and Coatings Technology, 2014, 239, 28- 33.
YU H L , ZHANG W , WANG H M , et al. In-situ synthesis of TiC/Ti composite coating by high frequency induction cladding[J]. Journal of Alloys and Compounds, 2017, 701, 244- 255.
YU H L , WEI M , ZHANG M Q , et al. Microstructure characteristics and nano mechanical properties of in-situ TiC/Ti composite coating by induction cladding[J]. Chinese Surface Engineering, 2018, 31 (5): 150- 157.
LV W J , ZHANG X N , ZHANG D , et al. Growth mechanism of reinforcement in in-situ processed TiB/Ti composites[J]. Acta Metallurgica Sinica, 2000, 36 (1): 104- 108.