锻压技术

6082铝合金锻造组织不均匀性及其对锻件性能的影响

英文标题：Forging microstructure inhomogeneity of 6082 aluminum alloy and its effect on properties of forgings

作者：张劲蒋震虞大联白玉琳邓运来

分类号：TG31

出版年,卷(期):页码：2020,45(9):8-15

摘要：

针对带筋板的连杆类锻件，结合有限元数值模拟，得到锻件的等效应变和有效应力，采用电子背散射衍射(EBSD)方法观察了不同应变区域的微观结构，并研究了锻造组织不均匀性对锻件力学性能和晶间腐蚀性能的影响。研究结果表明，在锻件不同区域，应力、应变存在很大的差距，锻件的微观组织、强度和晶间腐蚀性能存在不均匀性。在等效应变最小的区域，没有足够的变形能，主要是晶粒粗大的变形组织；在等效应变为2.1的区域，晶粒细化效果最为明显，在同样条件下的人工时效处理后的屈服强度和抗拉强度最高，分别为318和340 MPa，并且晶间腐蚀性能也是最佳的；在等效应变最大的区域，由于加大了变形储能，再结晶程度提高，晶粒长大导致强度有所下降。

For the connecting rod forgings with ribbed plates, the equivalent strain and effective stress of forgings were obtained by combining with finite element numerical simulation, and the effects of forging microstructure inhomogeneity on the mechanical properties and intergranular corrosion properties of forgings were studied by the electron backscattering diffraction (EBSD) method to observe the microstructures of different strain regions. The results show that the stress and strain vary greatly in different areas of forgings, and the microstructure, strength and intergranular corrosion properties of forgings are not uniform. In the region with the smallest equiralent strain, there is not enough deformation energy, and the deformation structure with coarse grain is the main. However, in the area with equivalent strain of 2.1, the grain refinement effect is the most obvious, the yield strength and the tensile strength after artificial aging treatment under the same conditions are the highest with 318 and 340 MPa respectively, and the intergranular corrosion property is also the best. In the region with the maximum equivalent strain, due to the increasing of deformation energy storage, the degree of recrystallization increases, and the growth of crystal grains results in decreased strength.

基金项目：

国家重点研发计划重点专项项目(2016YFB0300900)

张劲（1986-），男，博士，副教授 E-mail：zhangjinlari@csu.edu.cn

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