利用强流脉冲电子束（High current pulsed electron beam,HCPEB）技术对镍基高温合金GH4169进行表面处理,利用X射线衍射仪（X-ray diffraction,XRD）、扫描电子显微镜（Scanning electron microscope,SEM）和透射电子显微镜（Transmiss...利用强流脉冲电子束（High current pulsed electron beam,HCPEB）技术对镍基高温合金GH4169进行表面处理,利用X射线衍射仪（X-ray diffraction,XRD）、扫描电子显微镜（Scanning electron microscope,SEM）和透射电子显微镜（Transmission electron microscopy,TEM）对HCPEB诱发的微观结构进行详细的表征,并考察HCPEB辐照处理后样品表面的腐蚀性能。试验结果表明,HCPEB辐照后GH4169合金表面发生熔化并形成熔坑,熔坑密度随辐照次数的增加而降低,尺寸较大的第二相颗粒等可随着熔坑的喷发而清除,进而实现表面净化。HCPEB辐照后GH4169合金表面形成3~5μm厚的重熔层,重熔层内部以尺寸在100 nm左右的纳米晶为主,HCPEB辐照还可在表层诱发强烈的塑性变形,形成高密度的位错及变形孪晶等变形结构。HCPEB辐照显著地改善了GH4169合金的耐蚀性能,腐蚀性能的改善主要归因于表面净化效应以及表层纳米重熔层和高密度的晶体缺陷的形成,这些微观结构促进了表层钝化膜的形成,起到保护基体的作用。展开更多
Cold rolling and heat-treatment were used for the grain refinement of GH4169 superalloy plate.The effects of cold rolling reduction ratio and heat-treatment time on the precipitatedδphase,and the effects ofδ-phase c...Cold rolling and heat-treatment were used for the grain refinement of GH4169 superalloy plate.The effects of cold rolling reduction ratio and heat-treatment time on the precipitatedδphase,and the effects ofδ-phase content and morphology on the mechanical properties of the GH4169 alloy plates,are studied.The results demonstrate that coldrolling can promote the precipitation of theδphase and its transformation from theδ-Ni3Nb phase to theδ-NbNi4 phase.The comprehensive properties of the alloy are better when the heat treatment time is 1 h,with 132 MPa increase in the tensile strength and only 2.9%decrease in the elongation relative to those of the original material.The mechanical properties of the alloy are shown to change greatly with the change in theδ-phase morphology.展开更多
文摘利用强流脉冲电子束（High current pulsed electron beam,HCPEB）技术对镍基高温合金GH4169进行表面处理,利用X射线衍射仪（X-ray diffraction,XRD）、扫描电子显微镜（Scanning electron microscope,SEM）和透射电子显微镜（Transmission electron microscopy,TEM）对HCPEB诱发的微观结构进行详细的表征,并考察HCPEB辐照处理后样品表面的腐蚀性能。试验结果表明,HCPEB辐照后GH4169合金表面发生熔化并形成熔坑,熔坑密度随辐照次数的增加而降低,尺寸较大的第二相颗粒等可随着熔坑的喷发而清除,进而实现表面净化。HCPEB辐照后GH4169合金表面形成3~5μm厚的重熔层,重熔层内部以尺寸在100 nm左右的纳米晶为主,HCPEB辐照还可在表层诱发强烈的塑性变形,形成高密度的位错及变形孪晶等变形结构。HCPEB辐照显著地改善了GH4169合金的耐蚀性能,腐蚀性能的改善主要归因于表面净化效应以及表层纳米重熔层和高密度的晶体缺陷的形成,这些微观结构促进了表层钝化膜的形成,起到保护基体的作用。
基金State Key Laboratory of Mechanical Transmission for Advanced Equipment Project (SKLMT-MSKFKT-202219)Natural Science Foundation of Jiangsu Province (BK20220548)+1 种基金Open Research Fund from the State Key Lab of Advanced Metals and Materials,University of Science and Technology Beijing (2022-Z21)National Natural Science Foundation of China (52005223)。
基金Project(E2019203005)supported by the Natural Science Foundation of Hebei Province,China。
文摘Cold rolling and heat-treatment were used for the grain refinement of GH4169 superalloy plate.The effects of cold rolling reduction ratio and heat-treatment time on the precipitatedδphase,and the effects ofδ-phase content and morphology on the mechanical properties of the GH4169 alloy plates,are studied.The results demonstrate that coldrolling can promote the precipitation of theδphase and its transformation from theδ-Ni3Nb phase to theδ-NbNi4 phase.The comprehensive properties of the alloy are better when the heat treatment time is 1 h,with 132 MPa increase in the tensile strength and only 2.9%decrease in the elongation relative to those of the original material.The mechanical properties of the alloy are shown to change greatly with the change in theδ-phase morphology.
