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顾小燕, 林筱鹏, 王金凤, 李桓. 固溶处理对CMT电弧熔丝增材Inconel 625合金组织与性能调控[J]. 焊接学报, 2023, 44(5): 70-76. DOI: 10.12073/j.hjxb.20220608001
引用本文: 顾小燕, 林筱鹏, 王金凤, 李桓. 固溶处理对CMT电弧熔丝增材Inconel 625合金组织与性能调控[J]. 焊接学报, 2023, 44(5): 70-76. DOI: 10.12073/j.hjxb.20220608001
GU Xiaoyan, LIN Xiaopeng, WANG Jinfeng, LI Huan. Control of the microstructure and mechanical properties of CMT arc wire additive manufactured Inconel 625 alloy by solution treatment[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(5): 70-76. DOI: 10.12073/j.hjxb.20220608001
Citation: GU Xiaoyan, LIN Xiaopeng, WANG Jinfeng, LI Huan. Control of the microstructure and mechanical properties of CMT arc wire additive manufactured Inconel 625 alloy by solution treatment[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2023, 44(5): 70-76. DOI: 10.12073/j.hjxb.20220608001

固溶处理对CMT电弧熔丝增材Inconel 625合金组织与性能调控

Control of the microstructure and mechanical properties of CMT arc wire additive manufactured Inconel 625 alloy by solution treatment

  • 摘要: 对冷金属过渡(CMT)的电弧熔丝增材方法制备的Inconel 625合金试样进行不同温度的固溶处理. 研究了固溶处理对所制备的Inconel 625合金的微观组织和力学性能的影响规律. 结果表明,沉积态主要为沿沉积方向生长的柱状枝晶,基体组织主要为γ奥氏体相,在晶粒内和晶界上呈块状或链状分布着大量第二相Laves相以及微小MC颗粒. 固溶温度低于 1 000 ℃时,Laves相和碳化物溶解缓慢,此时固溶处理对合金组织性能的影响较小;当固溶处理温度增加至1 200 ℃时,第二相碳化物溶解,晶粒剧烈长大,并出现大量孪晶界,合金的硬度和抗拉强度有一定程度下降,屈服强度显著下降,断后伸长率显著提升.

     

    Abstract: Inconel 625 alloy samples prepared by cold metal transfer arc additive manufacturing (CMT AA) were solution treated at different temperatures. The microstructure and mechanical properties of the solution treated Inconel 625 alloy were investigated. The results showed that the as-deposited sample primarily consisted of columnar dendrites growing along the deposition direction. The matrix structure was predominantly γ-Ni austenite phase with a large number of second phases, including Laves phase and tiny MC particles distributed inside the grains and on grain boundaries in the form of “blocks” or “chains”. When the solution temperature was below 1000 ℃, the solution treatment had little effect on the microstructure and properties of the alloy due to the slow dissolution of Laves phase and carbides. As the solution treatment temperature increased to 1200 ℃, the second phase carbides dissolved, and the grains grew sharply with many twins. The hardness and tensile strength of the alloy decreased to some extent. The yield strength decreased, and the elongation increased significantly.

     

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