李荣飞,罗倩,袁琳,等.触变–塑变复合成形铸铁材料的耐磨损和抗腐蚀性能研究[J].精密成形工程,2022,14(6):50-58.
LI Rong-fei,LUO Qian,YUAN Lin,et al.Wear Resistance and Corrosion Resistance of Cast Iron Material Processed by Thixo-Plastic Hybrid Forming Process[J].Journal of Netshape Forming Engineering,2022,14(6):50-58. |
| 触变–塑变复合成形铸铁材料的耐磨损和抗腐蚀性能研究 |
| Wear Resistance and Corrosion Resistance of Cast Iron Material Processed by Thixo-Plastic Hybrid Forming Process |
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| DOI：10.3969/j.issn.1674-6457.2022.06.007 |
| 中文关键词: 触变–塑变复合成形 摩擦磨损 耐腐蚀性能 铸铁材料 |
| 英文关键词: thixo-plastic hybrid forming process friction and wear corrosion resistance cast iron material |
| 基金项目:国家自然科学基金面上项目(51975071) |
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| 中文摘要: |
| 目的 针对天然气压缩机用铸铁构件服役环境恶劣的情况，研究一种提升其耐磨损和抗腐蚀性能的成形工艺。方法 以天然气压缩机用FCD400铸铁材料为研究对象，通过熔融–冷却试验和热压缩试验获得FCD400铸铁材料在高温条件下的固–液相变规律、半固态触变成形性能、塑性成形性能。基于该铸铁材料性能建立合适的触变–塑变复合成形工艺方案。通过二段热压缩试验开展FCD400铸铁材料的触变–塑变复合成形的物理模拟，验证触变–塑变复合成形的可行性。随后，通过摩擦磨损试验和中性盐雾腐蚀试验，对比触变–塑变复合成形铸铁材料和原始铸态材料的耐磨损和抗腐蚀性能，验证触变–塑变复合成形的有效性。结果 触变成形阶段变形量为12 mm且塑性成形阶段变形量为20 mm的触变–塑变复合成形FCD400铸铁材料具有更加精细的珠光体片层，以及更高的硬度和更好的耐磨性能。触变成形阶段变形量为20 mm且塑性成形阶段变形量为12 mm的触变–塑变复合成形FCD400铸铁材料具有更加离散且细小的球状石墨，离散分布的细小球状石墨对基体的撕裂作用更小并能够减缓腐蚀速率。结论 通过调节触变–塑变复合成形工艺参数，能够实现对FCD400铸铁材料的耐磨损和抗腐蚀性能的主动调控。 |
| 英文摘要: |
| This paper is to study the forming process to improve the wear resistance and corrosion resistance in view of the harsh service environment of natural gas compressors. Taking FCD400 cast iron material for natural gas compressor as research object, the solid-liquid phase transformation law, semi-solid thixoformability and plastic formability of FCD400 cast iron material at high temperature were obtained through melting-cooling test and thermal compression test. On the basis of the properties of the cast iron material, a suitable thixo-plastic hybrid forming process scheme was established. To verify the feasibility of the established thixo-plastic hybrid forming process, physical simulation of the thixo-plastic hybrid forming process of FCD400 cast iron material was conducted by double-pass thermal compression tests. Then, through friction and wear test and neutral salt spray corrosion test, the wear resistance and corrosion resistance of cast iron material and original as-cast material processed by thixo-plastic hybrid forming process were compared to verify the effectiveness of thixo-plastic hybrid forming process. The FCD400 cast iron material processed by thixo-plastic hybrid forming process with a deformation amount of 12 mm in the thixoforming stage and a deformation amount of 20 mm in the plastic forming stage has a finer pearlite layer, higher hardness and better wear resistance performance. The FCD400 cast iron material processed by thixo-plastic hybrid forming process with a deformation amount of 20 mm in the thixomorphic stage and a deformation amount of 12 mm in the plastic forming stage has more discrete and fine spheroidal graphite. The discrete distribution of fine spherical graphite has less tearing effect on the matrix and can slow down the corrosion rate. The wear resistance and corrosion resistance of FCD400 cast iron material could be adjusted actively by adjusting the forming parameters of thixo-plastic hybrid forming process. |
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