热输入对<strong>Q1100</strong>钢焊接接头低温韧性及耐蚀性能的影响

doi:10.11901/1005.3093.2021.360

材料研究学报

2022, Vol. 36

Issue (8): 617-627 DOI: 10.11901/1005.3093.2021.360

研究论文

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热输入对Q1100钢焊接接头低温韧性及耐蚀性能的影响

陈杰¹, 李红英¹(

), 周文浩², 张青学², 汤伟², 刘丹²

^1.中南大学材料科学与工程学院长沙 410083
^2.湖南华菱湘潭钢铁有限公司湘潭 411101

Effect of Heat Input on Low Temperature Toughness and Corrosion Resistance of Q1100 Steel Welded Joints

CHEN Jie¹, LI Hongying¹(

), ZHOU Wenhao², ZHANG Qingxue², TANG Wei², LIU Dan²

^1.School of Materials Science and Engineering, Central South University, Changsha 410083, China
^2.Xiangtan Iron & Steel Co. Ltd. of Hunan Valin, Xiangtan 411101, China

引用本文:

陈杰, 李红英, 周文浩, 张青学, 汤伟, 刘丹. 热输入对Q1100钢焊接接头低温韧性及耐蚀性能的影响[J]. 材料研究学报, 2022, 36(8): 617-627.
Jie CHEN, Hongying LI, Wenhao ZHOU, Qingxue ZHANG, Wei TANG, Dan LIU. Effect of Heat Input on Low Temperature Toughness and Corrosion Resistance of Q1100 Steel Welded Joints[J]. Chinese Journal of Materials Research, 2022, 36(8): 617-627.

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摘要:

采用10 kJ/cm和15 kJ/cm两种焊接热输入对Q1100超高强钢进行熔化极气体保护焊,研究焊接接头的组织性能及局部腐蚀行为。结果表明：两种热输入焊接接头的焊缝组织主要为针状铁素体和少量的粒状贝氏体,粗晶区组织均为板条贝氏体,细晶区组织均为板条贝氏体和粒状贝氏体,临界相变区组织为多边形铁素体、马奥岛和碳化物的混合组织。两种热输入焊接接头中电荷转移电阻均为母材>热影响区>焊缝区,母材耐蚀性最好,热影响区次之,焊缝区耐蚀性最差。在腐蚀过程中,焊缝区作为阳极最先被腐蚀,当腐蚀一定时间后,腐蚀位置发生改变,阳极腐蚀区域转移到母材区,而焊缝区作为阴极得到保护。热输入为10 kJ/cm时,焊接接头具有更好的低温韧性和耐蚀性,其焊缝和热影响区-40℃冲击功分别为46.5 J和30.2 J。

关键词 ：金属材料, Q1100超高强钢, SVET, 热输入, 焊接接头, 耐腐蚀性能

Abstract：

Welded joints of Q1100 ultra high strength steel were made via gas shielded arc welding with welding heat inputs of 10 kJ/cm and 15 kJ/cm respectively. The microstructure, mechanical properties and local corrosion behavior of welded joints were studied. The results show that the microstructure of weld zone for the two welded joints is mainly acicular ferrite and a small amount of granular bainite. The microstructure is lath bainite for the coarse grain zone, and lath bainite and granular bainite for the fine grain zone of the weld joints. The microstructure of the critical phase transition zone is a mixture of polygonal ferrite, Mayo islets and carbide. The charge transfer resistance of various portions of the two welded joints could be ranked as the following order: base metal > heat affected zone > weld zone. The base metal had the best corrosion resistance, followed by the heat affected zone, and the weld zone had the worst corrosion resistance. During the corrosion process, the weld zone was first corroded as an anode. After a certain time of corrosion, the corrosion position changed, and the anode corrosion area was transferred into the base metal, while the weld zone was protected as a cathode. The welded joint with heat input of 10 kJ/cm has better low temperature toughness and corrosion resistance. The impact energies are 46.5 J and 30.2 J for the weld zone and heat affected zone respectively at -40℃.

Key words： metallic materials Q1100 ultra high strength steel scanning vibrating electrode technique heat input welded joint corrosion resistance

收稿日期: 2021-06-16

ZTFLH:

TG172.2

基金资助:长株潭国家自主创新示范区专项(2018XK2301)

作者简介: 陈杰,男,1996年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.360 或 https://www.cjmr.org/CN/Y2022/V36/I8/617

表1 实验钢的化学成分(质量分数,%)

图1 实验钢原始组织的SEM照片

图2 焊接实验用钢板尺寸

图3 焊接接头截面取样示意图

图4 焊接接头表面取样示意图

图5 电化学试样示意图

图6 两种热输入条件下焊缝区的SEM照片

图7 两种热输入条件下熔合区的SEM照片

图8 两种热输入焊接接头热影响区的SEM照片

图9 两种热输入焊接接头的电化学阻抗谱

图10 焊接接头硬度分布曲线

图11 两种热输入焊接接头-40℃冲击功对比

图12 等效电路图

表2 电化学阻抗谱拟合的电化学参数

图13 10 kJ/cm焊接接头腐蚀不同时间后表面电流密度分布图及其宏观腐蚀形貌

图14 15 kJ/cm焊接接头腐蚀不同时间后表面电流密度分布图及其宏观腐蚀形貌

图15 两种焊接接头表面平均腐蚀电流分布曲线

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