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

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摘要

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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	王昌盛
	熊江涛
	李京龙
	李鹏
	张赋升
	杨俊

关键词 ：搅拌摩擦焊, 红外热像仪, 疲劳性能, 弹塑性应变能

Abstract：

The weld joints were fabricated by friction stir welding (FSW) on 8mm thick 2024-O aluminum alloy with a rotating speed of 300r/min and a welding speed of 60mm/min. The microstructure and mechanical properties of parent material and weld joints were investigated. The fatigue tests were conducted on both parent metal and weld joint, during which the surface temperatures were recorded by an infrared thermal imager. The results show that the welds exhibit high gradient inhomogeneity in microstructure, and have good fatigue properties. The thermal mechanical affected zone (TMAZ) in advancing side is the weak area as examined by the tensile tests. The temperature change of the specimen surface of the parent material meets the characteristic of "three stages". Surface temperature variation tendency of the FSW welds is the same with that of the parent material in the first stage and the third stage, but has a downward trend in the second stage. The grains of the weld nugget zone and TMAZ accumulate lots of elastic and plastic strain energy through cyclic softening in the second stage that depress the conversion rate of mechanical energy to thermal energy.

Key words： friction stir welding thermal infrared imager fatigue property elastic and plastic strain energy

收稿日期: 2014-05-23 出版日期: 2015-09-26

基金资助:陕西省科技统筹创新工程计划项目(2012HBSZS021);西北工业大学基础研究基金(GrantJC20120224)

通讯作者: 李京龙 E-mail: lijinglg@nwpu.edu.cn

作者简介: 李京龙(1964-),男,教授,博士生导师,主要从事焊接和热喷涂领域的科研和教学工作,联系地址:陕西省西安市碑林区友谊西路127号西北工业大学公字楼403室(710072),E-mail:lijinglg@nwpu.edu.cn

引用本文:

王昌盛, 熊江涛, 李京龙, 李鹏, 张赋升, 杨俊. 2024铝合金搅拌摩擦焊焊缝区疲劳过程中的温度演变[J]. 材料工程, 2015, 43(9): 53-59.
Chang-sheng WANG, Jiang-tao XIONG, Jing-long LI, Peng LI, Fu-sheng ZHANG, Jun YANG. Temperature Evolution in Fatigue Test of 2024 Aluminum Alloy Weld Fabricated by Friction Stir Welding. Journal of Materials Engineering, 2015, 43(9): 53-59.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2015.09.009 或 http://jme.biam.ac.cn/CN/Y2015/V43/I9/53

Table 1 2024-O铝合金名义化学成分(质量分数/%)

Fig.1 拉伸试样尺寸

Fig.2 疲劳试样尺寸

Fig.3 疲劳实验系统

Fig.4 2024-O铝合金母材组织形貌

Fig.5 FSW焊缝区组织形貌
(a)整体形貌；(b)热影响区；(c)热力影响区；(d)焊核区

Table 2 2024-O铝合金母材与FSW焊缝拉伸性能

Fig.6 母材和FSW焊缝区疲劳寿命与加载应力的关系曲线

Fig.7 部分试样疲劳断裂后的实物图
(a)母材；(b)FSW接头

Fig.8 疲劳寿命在3×10³~5×10³周次时，试样温升值与循环次数关系曲线
(a) 母材;(b)FSW焊缝

Fig.9 疲劳寿命在1×10⁴~2×10⁴周次时，试样温升值与循环次数关系曲线
(a)母材;(b)FSW焊缝

Fig.10 试件疲劳过程中第二阶段的温度变化值

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