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材料工程  2015 

2024铝合金搅拌摩擦焊焊缝区疲劳过程中的温度演变

DOI: 10.11868/j.issn.1001-4381.2015.09.009, PP. 53-59

Keywords: 搅拌摩擦焊,红外热像仪,疲劳性能,弹塑性应变能

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Abstract:

在转速300r/min、焊速60mm/min的参数下制备了8mm厚AA2024-O搅拌摩擦焊(FSW)接头,对母材与FSW接头进行组织观察及力学性能测试,并用红外热像仪记录疲劳过程中试样表面的温度变化。结果表明FSW接头显示出了高梯度的组织结构不均匀性,具有较好的疲劳性能,前进侧热力影响区是其力学性能薄弱区;母材试样在循环载荷的作用下表面温度变化符合"三个阶段"的明显特征,而FSW接头表面温度在第一阶段与第三阶段的变化趋势与母材相似,在第二阶段呈下降趋势,焊核区与热力影响区晶粒通过不断的循环软化积累了大量的弹塑性应变能,使机械能向热能的转化率降低。

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