INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Effect of Rosin and Starch Additives on the Microstructure and Mechanical Properties of Fe-based Alloy Powder Laser Forming Sample |
CHEN Wei, QIU Changjun, YAN Mengda, HE Yuanwei, ZHANG Jingyi, QI Linsen
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College of Mechanical Engineering, University of South China, Hengyang 421001 |
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Abstract There were two types of specimens formed on steel substrate in experiment by using a 5 kW cross-flow CO2 laser. One was the net iron-based alloy powder sample, while the other was a sample of the rosin and starch double-layer micro-membrane coated iron-based alloy powder. The composite, microstructure and mechanical properties of those two types of test specimens were then investigated experimentally. It suggested that the rosin and starch double-layered micro-membrane was gasified and burnt in the laser weld pool. Along with that transient reductive atmosphere formed. This atmosphere then protected the formed powder from reducing loss caused by oxygen oxidation. The rate of Cr, Ni, and Si in the micro-membrane coated powder sample increase by an average of 0.12% compared with that of the net powder sample and the content of C and B rate were also increased by an average of 0.015% compared with that of the net powder specimen. Furthermore, the porosity and slag inclusion of the micro-membrane coated powder sample are reduced which rendered an improvement in the quality of the formed sample. The ave-rage Rockwell hardness and average tensile strength of the rosin and starch double-layer micro-film coated powder samples are 56.12HRC and 1 847 MPa, respectively, which are 4.7% and 16.2% higher than uncoated powder samples, respectively.
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Published: 21 May 2019
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Fund:This work was financially supported by the National Natural Science Foundation of China (51474130), Key Laboratory of Colleges and Universities in Hunan Province (No. 85 of Hunan Finance and Education Instruction [2014]) |
About author:: Wei Chen graduated from University of South China in July 2017 with a master’s degree in engineering. Conducted research under the guidance of Professor Qiu Changjun. At present, the main research field is laser forming technology.Changjun Qiu, professor of University of South China, tutor of doctoral tutor, leader of mechanical engineering discipline of key disciplines in Hunan Province, se-cond-level candidate of the first batch of 121 talent projects in Hunan Province, academic leader of Hunan Province, nuclear power equipment and its safe service technology Hunan the leader of the provincial science and techno-logy innovation team, the first council member of the Hunan European and American Association of Overseas Students, the member of the Hunan Provincial Higher Education Teacher’s Qualifications Evaluation Committee, the vice chairman of the Hunan Instrument and Instrumentation Society, and the equipment safety service technology in special circumstances. The person in charge of the Provincial Key Laboratory of Colleges and Universities. He has been engaged in nuclear facility safety engineering and decommissioning treatment technology, nuclear equipment metal materials safety service and surface modification technology for a long time. He has presided over one major research project of the Natio-nal Natural Science Foundation of China, three projects on the surface, and one national special project for science and technology. He has published more than 50 papers in high-impact factor publications at home and abroad, including more than 30 articles in SCI and EI, 3 invention patents, and 1 second prize in science and technology progress by the National Defense Science and Technology Commission. |
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