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田瑞, 江哲, 刘俊, 刘伟清, 池元清, 张永康. 纳米改性Al-Zn-Mg-Cu合金电弧熔丝增材成形工艺及组织和性能[J]. 焊接学报. DOI: 10.12073/j.hjxb.20231216001
引用本文: 田瑞, 江哲, 刘俊, 刘伟清, 池元清, 张永康. 纳米改性Al-Zn-Mg-Cu合金电弧熔丝增材成形工艺及组织和性能[J]. 焊接学报. DOI: 10.12073/j.hjxb.20231216001
TIAN Rui, JIANG Zhe, LIU Jun, LIU Weiqing, CHI Yuanqing, ZHANG Yongkang. Formability, microstructure and mechanical properties of nano-treated Al-Zn-Mg-Cu alloy fabricated by wire arc additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20231216001
Citation: TIAN Rui, JIANG Zhe, LIU Jun, LIU Weiqing, CHI Yuanqing, ZHANG Yongkang. Formability, microstructure and mechanical properties of nano-treated Al-Zn-Mg-Cu alloy fabricated by wire arc additive manufacturing[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION. DOI: 10.12073/j.hjxb.20231216001

纳米改性Al-Zn-Mg-Cu合金电弧熔丝增材成形工艺及组织和性能

Formability, microstructure and mechanical properties of nano-treated Al-Zn-Mg-Cu alloy fabricated by wire arc additive manufacturing

  • 摘要: 采用电弧熔丝增材制造技术(WAAM)对纳米改性Al-Zn-Mg-Cu 合金进行成形试验,分析了焊接电流、焊接速度、沉积路径、层间等待时间对成形性能的影响. 结果表明,在焊接电流190 A、焊接速度350 mm/min、往复沉积、层间等待时间为90 s时合金具有良好的成形性能. 对制备的直壁墙体进行了沉积后热处理,对不同状态合金的组织和性能进行了研究. 沉积态及热处理态合金显微组织均具有优异的各向同性,由细小的、无明显取向的等轴晶组成. T6处理显著提高了沉积态合金的硬度及力学性能,T6处理后平均硬度为179 HV,较沉积态提升61%,沿横向抗拉强度(Rm)、屈服强度(ReL)与断后伸长率(A)分别为469.7(±5.1) MPa,366.3(±1.4) MPa与6.4(±0.4)%,沿纵向抗拉强度(Rm)、屈服强度(ReL)与断后伸长率(A)分别为454.3(±18.8) MPa,364.7(±16.7) MPa与5.9(±0.5)%,具有良好的力学性能各向同性.

     

    Abstract: Wire arc additive manufacturing(WAAM) was utilized to fabricate the nano-treated Al-Zn-Mg-Cu alloy. Effects of fabrication parameters on WAAM formability are systematically investigated. The results show that the nano-treated Al-Zn-Mg-Cu alloy is well formed by alternative path under the following parameters: welding current 190 A, welding speed 350 mm/min, dwell time 90 s. Post-deposition heat treatment is employed to further modify the microstructure and the mechanical performance. The WAAMed Al-Zn-Mg-Cu alloys at both as-deposited and heat-treated states exhibit homogeneous microstructure composed of fine equiaxed grains without preferred orientation. T6 heat treatment significantly improve the microhardness and mechanical properties of the as-deposited alloy. The microhardness of the T6 treated alloy reaches 179Hv, which is 61% higher than that of the as-deposited sample. The ultimate tensile strength, yield strength, elongation of the T6 treated alloy along the longitudinal and vertical directions are 469.7(±5.1) MPa and 454.3(±18.8) MPa, 366.3(±1.4) MPa and 364.7(±16.7)MPa, 6.4%(±0.4%) and 5.9%(±0.5%), demonstrating that the WAAMed nano-treated Al-Zn-Mg-Cu alloy has excellent mechanical isotropy.

     

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