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以气雾化Inconel 718高温合金粉末为原料,采用激光近净成形增材制造技术制备用于酸性油田密封件与管道的Inconel 718合金,然后采用2种不同工艺进行热处理。通过扫描电镜与透射电镜观察、拉伸试验以及电化学腐蚀试验,对该合金的组织、力学性能和耐腐蚀性能进行分析和研究。结果表明:激光成形沉积态Inconel 718合金的主要缺陷为空心颗粒和氧化物颗粒,合金具有优异的抗腐蚀性能,但力学性能较差,抗拉强度为866.9 MPa。经过热处理后,由于γ″和γ′复合强化相的析出,合金的抗拉强度明显提高,伸长率降低。其中经均匀化+固溶+双时效处理的合金具有更优异的力学性能,抗拉强度达1 211.9 MPa,满足油田密封件管道的性能要求,且腐蚀性能优于目前用于酸性油田的轧制态Inconel 718高温合金。
Using Inconel 718 superalloy powder as raw material, Inconel 718 alloy for acid oil field seal and pipe was prepared by laser near net shape additive manufacturing technology and then heat treated by two different processes. The microstructure, mechanical properties and corrosion resistance of the alloy were studied by scanning electron microscopy (SEM) and transmission electron microscopy (TEM), tensile test and electrochemical corrosion test. The results show that the main defects of laser-deposited Inconel 718 alloy are hollow particles and oxide particles. The alloy has excellent corrosion resistance, but the mechanical properties are poor. The tensile strength is 866.9 MPa. After heat treatment, the tensile strength of the alloy increases obviously and the elongation decreases due to the precipitation of the γ "and γ ’composite strengthening phases, of which the alloys homogenized + solid solution + double aging treatment have better mechanical properties, The tensile strength is up to 1 211.9 MPa, which meets the performance requirements of the oilfield sealing pipelines and has better corrosion resistance than the Inconel 718 superalloy currently used in sour fields.