超声冲击处理MB8镁合金十字接头的表层组织及疲劳性能

doi:10.11868/j.issn.1001-4381.2016.001439

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摘要

采用超声冲击方法对MB8镁合金十字接头焊趾处进行超声冲击处理，对比测试焊态及冲击处理态接头的表层组织和疲劳性能。结果表明：超声冲击处理可以在MB8镁合金焊接接头表面获得纳米晶组织。在循环寿命为2×10⁶条件下，焊态试样的条件疲劳强度为32.07MPa，冲击处理态试样的条件疲劳强度为41.88MPa，提高了30.59%。未冲击接头疲劳断裂大多发生在焊缝缺陷处，冲击处理后的接头则发生在热影响区。超声冲击处理不仅可以大幅提高MB8镁合金十字接头的疲劳寿命，还可以改变接头疲劳断裂位置。此外，热影响区也是MB8镁合金十字接头疲劳断裂的薄弱区域，这与热影响区晶粒粗大有很大的关系。

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	何柏林
	江明明
	于影霞
	李力

关键词 ：超声冲击, MB8镁合金, 十字接头, 疲劳性能, 断口形貌

Abstract：

Surface treatment was carried out on the weld toe of MB8 magnesium alloy welded joints with ultrasonic impact treatment(UIT) method. The Surface microstructure and the fatigue property of treated and as-welded MB8 magnesium alloy welded joints were investigated. The experimental results show that after ultrasonic impact treatment, nano-crystalline microstructure is obtained by UIT method. Under the condition of the cycle life of 2×10⁶, the conditional fatigue limit of as-welded joints is 32.07MPa, and the conditional fatigue limit of treated joints is 41.88MPa, which is increased by 30.59% than that of as-welded. The fatigue fracture of as-welded joints occurs mostly in the defects of weld zone, and the fatigue fracture of treated joints occurs mostly in the heat-affected zone. The ultrasonic impact treatment can not only increase the fatigue life of the joints, but also can change the fracture position of the samples. In addition, the heat affected zone is also a weak area of the fatigue fracture of the MB8 magnesium alloy cross joints, which is greatly related with the coarse grains in the heat affected zone.

Key words： ultrasonic impact MB8 magnesium alloy cross joint fatigue property fracture morphology

收稿日期: 2016-11-30 出版日期: 2018-10-17

中图分类号:	TG405
	TG457.19

基金资助:国家自然科学基金项目(51265013);江西省自然科学基金项目(20151BAB206007);江西省工业支撑重点项目(20161BBE50072)

通讯作者: 何柏林 E-mail: hebolin@163.com

作者简介: 何柏林(1962-), 男, 教授, 博士, 博士生导师, 主要研究方向为材料强度与断裂及表面强化技术, 联系地址:江西省南昌市华东交通大学材料学院(330013), E-mail:hebolin@163.com

引用本文:

何柏林, 江明明, 于影霞, 李力. 超声冲击处理MB8镁合金十字接头的表层组织及疲劳性能[J]. 材料工程, 2018, 46(10): 70-76.
Bo-lin HE, Ming-ming JIANG, Ying-xia YU, Li LI. Microstructure and Fatigue Property of MB8 Magnesium Alloy Cross Welded Joints with Ultrasonic Impact. Journal of Materials Engineering, 2018, 46(10): 70-76.

链接本文:

http://jme.biam.ac.cn/CN/10.11868/j.issn.1001-4381.2016.001439 或 http://jme.biam.ac.cn/CN/Y2018/V46/I10/70

Table 1 MB8和MB3镁合金的化学成分(质量分数/%)

Fig.1 MB8十字接头的形状与尺寸
(a)俯视图；(b)主视图

Table 2 MB8镁合金的焊接工艺参数

Fig.2 MB8镁合金十字接头的金相组织
(a)焊缝及热影响区；(b)热影响区及母材

Fig.3 冲击处理表面组织的TEM明场像(a)和对应选区电子衍射花样图(b)

Fig.4 冲击处理后表层组织内部位错缠结、位错墙和亚晶的TEM图

Table 3 两组试样的疲劳实验数据

Fig.5 焊态及超声冲击态试样的S-N曲线

Table 4 MB8镁合金十字接头S-N曲线对应的参数

Fig.6 接头疲劳寿命与应力的关系

Fig.7 冲击态(a)和焊态(b)接头断裂位置

Fig.8 焊态(1)和冲击态(2)疲劳断口的表面形貌
(a)疲劳裂纹源区；(b)扩展区；(c)瞬断区

Fig.9 疲劳断口中的解理台阶(a)和二次裂纹(b)

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