首页|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

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

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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 178.3 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.
Formability,microstructure and mechanical properties of nano-treated Al-Zn-Mg-Cu alloy fabricated by wire arc additive manufacturing
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 improves the microhardness and mechanical properties of the as-deposited alloy.The microhardness of the T6 treated alloy reaches 178.3 HV,which is 61%higher than that of the as-deposited sample.The ultimate tensile strength,yield strength,elongation of the T6 treated alloy along horizontal and vertical directions are 469.7(±5.1)MPa,366.3(±1.4)MPa,6.4(±0.4)%and 454.3(±18.8)MPa,364.7(±16.7)MPa,5.9(±0.5)%respectively,demonstrating that the WAAMed nano-treated Al-Zn-Mg-Cu alloy has excellent mechanical isotropy.

wire arc additive manufacturingnano-treatingAl-Zn-Mg-Cu alloyformabilitymicrostructure and mechanical properties

田瑞、江哲、刘俊、刘伟清、池元清、张永康

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广东省科学院中乌焊接研究所,广东省材料连接与先进制造重点实验室,广州,510650

重庆科技大学,冶金与材料工程学院,重庆,401331

广东工业大学,机电工程学院,广州,510006

电弧熔丝增材制造 纳米改性 Al-Zn-Mg-Cu合金 成形性能 组织和性能

广东省科学院发展专项资金项目广东省科学院发展专项资金项目广东省科学院发展专项资金项目资助广东省科学院发展专项资金项目资助

2022GDASZH20220101072020GDASYL20200301001

2024

10.12073/j.hjxb.20231216001

焊接学报
中国机械工程学会　中国机械工程学会焊接学会　机械科学研究院哈尔滨焊接研究所

焊接学报

CSTPCD北大核心
影响因子：0.815
ISSN：0253-360X
年,卷(期)：2024.45(8)
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