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Microstructure and nano-indentation behavior of detonation sprayed iron-based amorphous coating |
OUYANG Sheng1, CHU Zhiqiang1, TANG Qiuhao2, XIE Lu3 |
1. Hunan Metallurgy Material Institute Co., Ltd., Changsha 410014, China; 2. Hunan Provincial Key Laboratory of Advanced Materials for New Energy Storage and Conversion,Hunan University of Science and Technology, Xiangtan 411201, China; 3. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China |
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Abstract The iron-based amorphous coatings were prepared by detonation spray under three kinds of oxygen fuel ratios. The microstructure and nanoindentation behavior were examined by XRD, SEM and nanoindenter. The results show that the amorphous phase contents of coatings under 1:1, 1.2:1 and 1.5:1 are calculated to be 88.71%, 86.18% and 81.36%, respectively. The variation speeds of indentation depth are similar under different load, indicating the homogenous coating structure. In similar position, the coatings under oxygen fuel ratios of 1:1 and 1.2:1 have higher hardness, exhibiting smaller maximum indentation depth. In the longitudinal direction, the variation of nanohardness is very small. In the transverse direction, the nanohardness value decreases from 16.75 GPa to 10.25 GPa with increasing the distance from the coating to the substrate.
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Received: 23 July 2020
Published: 18 January 2021
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