Effect of cerium oxide on microstructure and toughness of the hybrid welding joints of high strength steels

被引：0
|
作者：
Wang L. [1 ,2 ]
Liu F. [1 ]
Zhang H. [1 ]
Liu S. [1 ]
Liu W. [1 ]
Liu S. [1 ]
Shao Q. [1 ]
机构：
[1] College of Mechanical and Electric Engineering, Changchun University of Science and Technology, Changchun
[2] Changchun UP Optotech Co., Ltd., Changchun
来源：
Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2016年 / 52卷 / 22期
关键词：
Cerium oxide; Impact toughness; Inclusion; Laser-arc hybrid welding; Microstructure;
D O I：
10.3901/JME.2016.22.070
中图分类号：
学科分类号：
摘要：
Rare earth is an ideal modification and alloying element. Cerium oxide is transited into welding pool through preset method for Nd:YAG laser-MAG arc hybrid welding. Then microstructure and low temperature (-40℃) impact properties of welded joints are studied. Results indicated that proper amount of cerium oxide can control the grain growth and refine the microstructure of weld; the grain refinement level is very obvious in the addition of 0.3%. Grain size and dendrites gap are increased with the increase of cerium oxide, but cerium oxide doesn't change its microstructure, they are still dominated by lath martensite. Cerium oxide can purify the weld, modify the inclusion effectively and play a heterogeneous nuclei role; inclusions of the weld zone are mainly cerium oxides and cerium oxysulfide. Through low temperature impact test, it was found that the impact energy of the weld and heat affect zone is first increased and then decreased with the increase of the amount of cerium oxide, the impact energy is the maximum in the addition of 0.3% and 0.5%, there are many and deep dimples in the fracture, It is mainly ductile fracture for welded joint. © 2016 Journal of Mechanical Engineering.
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页码：70 / 77
页数：7
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