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浙江大学学报(工学版)  2018, Vol. 52 Issue (2): 217-223    DOI: 10.3785/j.issn.1008-973X.2018.02.002
机械与动力工程     
S30408焊接接头低温力学性能试验
丁会明1, 吴英哲1, 郑津洋1,2,3, 陈朝晖4, 尹立军4
1. 浙江大学 化工机械研究所, 浙江 杭州 310027;
2. 浙江大学 流体动力与机电系统国家重点实验室, 浙江 杭州 310027;
3. 高压过程装备与安全教育部工程研究中心, 浙江 杭州 310027;
4. 全国锅炉压力容器标准化技术委员会, 北京 100029
Experimental study on low-temperature mechanical properties of S30408 welded joints
DING Hui-ming1, WU Ying-zhe1, ZHENG Jin-yang1,2,3, CHEN Zhao-hui4, YIN Li-jun4
1. Institute of Process Equipment, Zhejiang University, Hangzhou 310027, China;
2. State Key Laboratory of Fluid Power and Mechanical Systems, Zhejiang University Hangzhou 310027, China;
3. High-Pressure Process Equipment and Safety Engineering Research Center of Ministry of Education, Hangzhou 310027, China;
4. China Standardization Committee on Boilers and Pressure Vessels, Beijing 100029, China
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摘要:

为了研究国产奥氏体不锈钢S30408在低温下的力学性能变化规律,通过-196~20℃下的低温拉伸试验和冲击试验,获得S30408焊接接头与母材的低温拉伸性能和冲击性能数据.试验结果表明:焊接接头与母材的屈服强度和抗拉强度随温度降低呈现明显的增加趋势,低温强化效应显著;夏比冲击吸收能量和侧膨胀值则随温度降低呈现下降趋势;焊缝处铁素体含量最高,冲击韧性最差,且焊缝处冲击韧性的降低与其本身在低温下抵抗裂纹扩展能力的降低有关;铁素体分布的不均匀性致使焊接接头存在微观力学性能的差异,对接头处变形产生塑性拘束,削弱了焊接接头的承载能力.

Abstract:

Tensile and impact tests at -196~20℃ were conducted out to obtain the low-temperature tensile properties and impact toughness of the S30408 base metal and welded joint. The experimental results show that the yield strength and tensile strength of both base metal and welded joint significantly increase with temperature decreasing due to the cryogenic strengthening effect. The Charpy absorbed energy and lateral expansion tend to degrade when temperature decreases. The welding zone has the worst impact toughness because it contains the largest amount of the ferrite content. The reduction of the impact toughness in the welding zone is related to the decreasing in the crack propagation resistance at cryogenic temperatures. The inhomogeneous ferrite distribution in the welded joint leads to non-uniform micro-mechanical properties which causes a plastic constraint on the deformation, and consequently results into a weak ultimate bearing capacity of the welded joint.

收稿日期: 2016-12-20 出版日期: 2018-03-09
CLC:  TG407  
基金资助:

国家重点研发计划资助项目(2016YFC0801905).

通讯作者: 吴英哲,男,助理研究员.orcid.org/0000-0002-7246-8767.     E-mail: yzwu@zju.edu.cn
作者简介: 丁会明(1990-),男,博士生,从事新能源储运装备与深冷压力容器等研究.orcid.org/0000-0002-4145-8013.E-mail:ddhhmm558@163.com
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引用本文:

丁会明, 吴英哲, 郑津洋, 陈朝晖, 尹立军. S30408焊接接头低温力学性能试验[J]. 浙江大学学报(工学版), 2018, 52(2): 217-223.

DING Hui-ming, WU Ying-zhe, ZHENG Jin-yang, CHEN Zhao-hui, YIN Li-jun. Experimental study on low-temperature mechanical properties of S30408 welded joints. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 2018, 52(2): 217-223.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2018.02.002        http://www.zjujournals.com/eng/CN/Y2018/V52/I2/217

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