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<p>TC6 is one of the main materials used for aero-engine blades due to its excellent corrosion and fatigue resistance, high specific strength, and good ductility. The service performance of the blades, especially fatigue performance, is significantly influenced by the machined surface integrity. In this study, the diamond rotary rolling treatment (DRRT) was applied to improve the surface integrity as well as the fatigue life of&#xa0;TC6. The surface integrity properties in terms of residual stress, microhardness, and surface roughness of the milled and DRRT-treated blades were measured. The surface microstructure alterations were analyzed by electron backscattered diffraction. The mechanical property and the fatigue life of the milled and DRRT-treated specimens were tested. The results showed that the DRRT-treated blade surface acquired significant biaxial residual compressive stresses up to − 1069&#xa0;MPa in longitude direction and − 780&#xa0;MPa in transverse direction. The surface roughness level was maintained at 0.3-0.4&#xa0;μm. Compared to the milled surface, the strengthened surface had a higher surface hardness of 409&#xa0;HV and a deeper hardened layer of more than 800&#xa0;μm. Besides, the microstructural results of the blade surface layer showed that the surface layer was subjected to severe plastic deformation, and nanograins were observed within a few micrometers from the surface. Comparison of the tensile curves showed that the strength was increased and the plasticity decreased of the DRRT-treated surface layer. The fatigue life test indicated that the fatigue life of the strengthened specimens was improved by 132.8% compared to the milled one. The increase in fatigue life is related to the surface residual compressive stress, higher hardness, lower surface roughness, and higher strength.</p>

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Improving Surface Property and Fatigue Life of TC6 Blade by Diamond Rotary Rolling Treatment

  • 期刊论文

  • 发表日期：

    2025年2月10日

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  • Wenqian Zhang,
  • Di Jiang,
  • Xiangling Li,
  • Xingwei Xu,
  • Zhipeng Mo,
  • Zihao Yuan,
  • Linlin Wang

摘要

TC6 is one of the main materials used for aero-engine blades due to its excellent corrosion and fatigue resistance, high specific strength, and good ductility. The service performance of the blades, especially fatigue performance, is significantly influenced by the machined surface integrity. In this study, the diamond rotary rolling treatment (DRRT) was applied to improve the surface integrity as well as the fatigue life of TC6. The surface integrity properties in terms of residual stress, microhardness, and surface roughness of the milled and DRRT-treated blades were measured. The surface microstructure alterations were analyzed by electron backscattered diffraction. The mechanical property and the fatigue life of the milled and DRRT-treated specimens were tested. The results showed that the DRRT-treated blade surface acquired significant biaxial residual compressive stresses up to − 1069 MPa in longitude direction and − 780 MPa in transverse direction. The surface roughness level was maintained at 0.3-0.4 μm. Compared to the milled surface, the strengthened surface had a higher surface hardness of 409 HV and a deeper hardened layer of more than 800 μm. Besides, the microstructural results of the blade surface layer showed that the surface layer was subjected to severe plastic deformation, and nanograins were observed within a few micrometers from the surface. Comparison of the tensile curves showed that the strength was increased and the plasticity decreased of the DRRT-treated surface layer. The fatigue life test indicated that the fatigue life of the strengthened specimens was improved by 132.8% compared to the milled one. The increase in fatigue life is related to the surface residual compressive stress, higher hardness, lower surface roughness, and higher strength.