Effect of Heat Treatment on Microstructure and Properties of Laser-CMT Composite Additively Formed Parts of 205B Aluminium Alloy

NIU Chenxu; ZHANG Jia; LYU Meng; GUO Haiwei; YANG Fenghao

doi:10.3969/j.issn.1674-6457.2025.06.020

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Journal of Netshape Forming Engineering ›› 2025, Vol. 17 ›› Issue (6) : 187-196. DOI: 10.3969/j.issn.1674-6457.2025.06.020

Light Alloy Forming

Effect of Heat Treatment on Microstructure and Properties of Laser-CMT Composite Additively Formed Parts of 205B Aluminium Alloy

NIU Chenxu¹, ZHANG Jia¹, LYU Meng^1,2, GUO Haiwei^1,2*, YANG Fenghao³

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Abstract

The work aims to conduct heat treatment on additively formed parts of 205B aluminium alloy of poor tissue uniformity, low strength and large anisotropy of mechanical properties, so as to improve the properties of the alloy. Solid solution quenching+aging heat treatment method was adopted and the macro-microstructure morphology, second phase distribution, micro-hardness and tensile strength of laser-arc (CMT) composite additive 205B aluminum alloy under different treatment processes were characterized. With the increase of solid solution time, the α+θ eutectic organization at the grain boundary gradually disappeared, and the Cu element was solidly dissolved into the Al matrix; When the solid solution time was 120 min, the micro-hardness, transverse tensile strength, and longitudinal tensile strength of the material were 152.48HV, 439.51 MPa, and 429.15 MPa, respectively. With the prolongation of aging time, the T-phase in the crystal continued to grow and aggregate, forming “black lumps”; The micro-hardness, transverse tensile strength and longitudinal tensile strength of the specimen showed a trend of first increasing and then decreasing with the increase in solid solution time. When the aging time is 360 min, the material obtained the best mechanical properties (hardness of 154.67HV, transverse tensile strength of 448.05 MPa, longitudinal tensile strength of 435.59 MPa). The use of solid solution quenching+aging heat treatment method can effectively improve the macro-microstructure uniformity of 205B aluminum alloy obtained by composite additive and can significantly increase its hardness and reduce the tensile strength anisotropy.

Key words

205B aluminum alloy / solid solution quenching / aging heat treatment / uniformity / anisotropy

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NIU Chenxu, ZHANG Jia, LYU Meng, GUO Haiwei, YANG Fenghao. Effect of Heat Treatment on Microstructure and Properties of Laser-CMT Composite Additively Formed Parts of 205B Aluminium Alloy[J]. Journal of Netshape Forming Engineering. 2025, 17(6): 187-196 https://doi.org/10.3969/j.issn.1674-6457.2025.06.020

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Funding

Key Scientific and Technological Projects in Henan Province (232102231011, 222102230025); Key Research Projects of Higher Education Institutions by Henan Provincial Department of Education (23B430016)