Effects of boron on the microstructure and impact toughness of weathering steel weld metals and existing form of boron

被引：12
作者：
Cao, Rui [1 ,2 ]
Han, Cheng [1 ,2 ]
Guo, Xili [3 ]
Jiang, Yong [3 ]
Liao, Fen [3 ]
Yang, Fei [3 ]
Dou, Guishan [1 ,2 ]
Yan, Yingjie [1 ,2 ]
Chen, Jianhong [1 ,2 ]
机构：
[1] Lanzhou Univ Technol, State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Gansu, Peoples R China
[2] Lanzhou Univ Technol, Dept Mat Sci & Engn, Lanzhou 730050, Gansu, Peoples R China
[3] Atlantic China Welding Consumables Inc, Zigong 643000, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2022年 / 833卷
基金：
中国国家自然科学基金;
关键词：
Weathering steel weld metals; Boron content; Impact toughness; Fracture; SIMS; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; GRAIN-BOUNDARY; SEGREGATION; SILICON;
D O I：
10.1016/j.msea.2021.142560
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
In this study, the effects of various boron contents on the microstructure, impact toughness, and fracture surface of the weathering steel weld metals were firstly investigated. Secondly, the existence form and distribution of the boron element were also studied. Results indicated with the increase of boron content, the microstructure gradually changes from block ferrite to granular bainite, the amount of boron-containing second phases obviously increases, and the low temperature impact toughness first increases and then decreases. The weld metal with 0.0042% boron content has the best low temperature impact toughness. Compared to the weld metals with boron free and boron content of 0.0087%, the ductile brittle transition temperature of the weld metal with boron content of 0.0042% is reduced by 29 degrees C and 25 degrees C respectively. Due to the transformation of microstructure and the increase of second phases, the microhardness presents an increasing trend. By means of Secondary Ion Mass Sectrometry (SIMS), the distribution and existing forms of boron are accurately characterized. It is found that boron is mainly concentrated on the original austenite grain boundary in the form of boron oxide, and a very small amount of boron exists in the form of boron carbide. Therefore, the appropriate amount of boron can significantly improve the low-temperature impact toughness of the weathering steel weld metal. The optimal boron content in this study is 0.0042%. Excessive or insufficient boron addition leads to the reduction of low temperature impact toughness.
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页数：19
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