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采用离心浇铸挤压工艺制备了20Cr/1Cr18Ni9Ti复合钢管.通过扫描电镜研究了试制复合钢管界面区域的显微组织,利用拉伸实验和热疲劳实验测试了其力学性能.结果表明,采用离心浇铸挤压工艺生产的复合钢管实现了界面完全冶金结合,界面结合强度大大提高,界面处存在的过渡区增强了复合管的加工、使用性能.采用此新工艺生产的复合钢管具有较好的组织和性能,并且工序简短,生产成本低.
The microstructure of the 20Cr / 1Cr18Ni9Ti composite steel tube was prepared by centrifugal casting and extrusion process.The microstructure of the interface of the composite steel tube was studied by scanning electron microscope.The mechanical properties of the composite steel tube were tested by tensile test and thermal fatigue test.The results show that centrifugal casting extrusion The composite steel pipe produced by the pressure process achieves the complete metallurgical bonding of the interface, the bonding strength of the interface is greatly increased, and the transitional region existing at the interface enhances the processing and the use performance of the composite pipe. The composite steel pipe produced by the new process has better structure and performance , And the process is short, low production costs.