材料科学

Vol.6 No.3 (May 2016)

冷变形对2219铝合金环轧件组织和力学性能的影响
Effect of Cold-Deformation on Mechanical Property and Microstructure of 2219 Aluminum Alloy Ring Rolled Pieces

 

作者:

陈运强 , 陈康华 , 陈送义 , 邢 军 :中南大学轻合金研究院,湖南 长沙

 

关键词:

2219大型环轧件冷变形力学性能腐蚀性能时效析出相2219 Large Ring Rolled Pieces Cold-Deformation Mechanical Properties Corrosion ResistanceAge Precipitation Phase

 

摘要:

本文采用维氏硬度计、拉伸力学性能测试,透射电镜(TEM)、扫描电镜(SEM)等实验分析手段,研究了2219环轧件在不同冷变形条件下的组织和力学性能。结果表明:随着冷变形程度的增加,合金达到峰值时效的时间明显缩短,其峰值硬度逐渐增加;材料的抗拉强度和屈服极限随时冷变形量的增加先增加后略微下降,冷变形量为3%时性能最佳,抗拉强度为426.54 MPa (轴向)、436.62 MPa (切向)、445.67 MPa (径向)和屈服强度为323.88 MPa (轴向)、334.35 MPa (切向)、336.72 MPa (径向);随着冷变形量的增加,合金塑性整体呈下降趋势,以切向降低最为显著。随着冷变形程度的增加,合金析出相逐渐增长加厚,第二相粒子位错运动机制由切过机制转换为绕过机制。综合考虑,当变形量为3%时性能最佳。

The effect of cold-deformation about 2219 aluminum alloy ring rolled pieces was investigated by Vicker hardness TEM, SEM, and mechanical testing. Study shows that hardness and time of peak-aging gradually increase following the adding of cold-deformation. Yield strength or tensile strength increases firstly and then maintains as the cold-deformation adding. At deformation 3%, it has best properties with the tensile strength: 426.52 MPa (axial direction), 436.62 MPa (tangent direction) and 445.67 MPa (radial direction), and yield strength: 323.88 MPa (axial direction), 334.35 MPa (tangent direction), 336.72 MPa (radial direction). The elongation will decrease along with the cold-deformation adding, which is particularly significant along tangent direction. As cold-defor- mation increases, precipitation of alloy becomes longer and wider, the mechanism of dislocation changes to Orowan from the cross precipitation. In general, forge pieces have best prop-erties at 3% deformation.

文章引用:

陈运强 , 陈康华 , 陈送义 , 邢 军 (2016) 冷变形对2219铝合金环轧件组织和力学性能的影响。 材料科学, 6, 197-206. doi: 10.12677/MS.2016.63025

 

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