目的 研究电弧增材制造工艺下SiC颗粒对2319铝合金丝材高温下组织与性能的影响规律。方法 在2319铝合金丝材中分别添加质量分数为0%、0.15%和0.3%的SiC（颗粒直径为3~5 μm）颗粒,使用WAAM冷金属过渡交流脉冲焊接技术制备了堆积体,通过在堆积体上截取金相和拉伸试样,使用金相、SEM、EDS、TEM和拉伸等实验方法分析试样高温下的组织和力学性能。结果 添加SiC颗粒能够减小晶粒的尺寸,当SiC颗粒添加量（质量分数,下同）为0.15%和0.3%时,堆积体T6态高温下晶粒的平均尺寸从27.39 μm减小至22.79 μm和24.46 μm,分别减小了16.8%和11.0%。添加SiC颗粒会使2319铝合金初生θ相的尺寸发生改变。当SiC颗粒的添加量为0.15%时,SiC颗粒在堆积体中分散良好,并未出现团聚现象,且SiC颗粒与2319铝合金基体的结合面未见空洞或者间隙,结合良好。与未添加SiC颗粒相比,当添加0.15%和0.3% SiC颗粒后,横向抗拉强度均从296 MPa提高至342 MPa,提高了15%;纵向抗拉强度从284 MPa提升至343 MPa和327 MPa,分别提高了20%和15%。结论 添加SiC颗粒能细化微观组织晶粒,提高WAAM 2319铝合金的高温力学性能。
Abstract
The work aims to investigate the effect of SiC particles on the microstructure and properties of 2319 aluminium alloy under high temperature in wire and arc addictive manufacturing (WAAM). Specimens of 2319 aluminium alloy were added with 0, 0.15%, and 0.3% SiC (3-5 μm) particles and a deposit was prepared with the WAAM Cold Metal Transfer Pulse Advanced (CMT-PA) technology. Metallographic, SEM, EDS, TEM, and tensile tests were conducted on specimens cut from the deposit to analyze the microstructure and mechanical properties at high temperatures. The addition of SiC particles reduced the grain size. When the SiC particle content was 0.15% and 0.3%, the average grain size of the deposit in the T6 state decreased from 27.39 μm to 22.79 μm and 24.46 μm, respectively, representing a reduction of 16.8% and 11.0%. The addition of SiC particles altered the size of the primary θ-phase in 2319 aluminium alloy. When 0.15% SiC particles were added, they were well-dispersed in the deposit without agglomeration, and no voids or gaps were observed at the interface between the SiC particles and the 2319 aluminium alloy matrix, indicating good bonding. The changes in high temperature mechanical properties with the addition of 0.15% and 0.3% SiC particles, compared to those without SiC particles, were as follows: the transverse tensile strength increased from 296 MPa to 342 MPa, an increase of 15% and the longitudinal tensile strength increased from 284 MPa to 343 MPa and 327 MPa, respectively, representing an increase of 20% and 15%. The addition of SiC particles can refine the microstructure grains and improve the high temperature mechanical properties of WAAM 2319 aluminium alloy.
关键词
WAAM /
铝合金 /
SiC颗粒 /
微观组织 /
高温力学性能
Key words
WAAM /
aluminium alloy /
SiC particles /
microstructure /
high temperature mechanical properties
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