304/304L不锈钢TIG焊两种搭接接头的组织及力学性能

金雪; 朱平; 李晗; 秦兴元

doi:10.13433/j.cnki.1003-8728.2018.0320

304/304L不锈钢TIG焊两种搭接接头的组织及力学性能

doi: 10.13433/j.cnki.1003-8728.2018.0320

金雪^1,2,
朱平^1,2, ,,
李晗^1,2,
秦兴元^1,2

1.
上海交通大学机械系统与振动国家重点实验室, 上海 200240;
2.
上海交通大学上海市复杂薄板结构数字化制造重点实验室, 上海 200240

详细信息

作者简介:
金雪(1991-),硕士研究生,研究方向为金属结构焊接及疲劳性能,jinxue0927@sjtu.edu.cn

通讯作者:
朱平,教授,博士生导师,博士,pzhu@sjtu.edu.cn

计量
- 文章访问数: 250
- HTML全文浏览量: 45
- PDF下载量: 6
- 被引次数: 0
出版历程
- 收稿日期: 2017-02-17
- 刊出日期: 2018-03-05

Microstructure and Properties of Different TIG Lap Joint of 304/304L

Jin Xue^1,2,
Zhu Ping^{1,2
, ,},
Li Han^1,2,
Qin Xingyuan^1,2

1.
State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University, Shanghai 200240, China;
2.
Shanghai Key Laboratory of Digital Manufacture for Thin-walled Structures, Shanghai Jiaotong University, Shanghai 200240, China

摘要

摘要: 搭接接头焊缝在实际工况中存在受拉力和剪切力两种受力状态，其力学性能的差异对工程应用中选取焊缝形式有重要意义。对不锈钢304及304L进行钨极惰性气体保护焊（TIG焊），研究了两种样件焊接接头的显微组织、硬度、拉伸性能和疲劳特性。结果表明：两种搭接形式下的焊接接头从母材到焊核，可根据晶粒类型和大小分为7个区域。焊缝受拉力样件的断裂延伸率为19.3%，在接头区域两种组织过渡处断裂；受剪切力样件的断裂延伸率为12.7%，在材料尺寸变化、应力集中处断裂。焊缝受拉力样件断裂韧性、抗拉强度和疲劳性能更强，结构尺寸变化和应力集中对受剪切力样件力学性能的影响较大。
- 304L不锈钢 /
- 搭接接头 /
- 微观组织 /
- 拉伸试验 /
- 疲劳试验
Abstract: There exists two stress state by the tensile force and shear force of lap joint weld, the differences of mechanical performance make sense for choosing weld form in engineering application. Tungsten inert gas (TIG) is used to weld 304 and 304L stainless steel. With metallographic, hardness, quasi static tensile and fatigue experiments, the structure microstructure, hardness distribution and mechanical properties of two different laps are obtained. The results show that the lap weld joint from the parent metal to the welding is divided into seven areas for the difference of microstructure. Besides, the tensile sample's elongation rate is of 19.3% and fructures at differences in the organization, while the shear sample's elongation rate is of 12.7% and fructures for size changing and stress concentration. The tensile sample has higher fracture toughness, tensile strength and fatigue damage properties, while joint strength of shear sample is significantly affected by the change in structure size and the stress concentration.
- lap weld /
- microstructure /
- experiments /
- mechanical properties /
- fatigue damage

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参考文献(12)

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