激光技术2018，Vol.42Issue(4)：476-481,6.DOI:10.7510/jgjs.issn.1001-3806.2018.04.009
高氮钢复合焊接接头微观组织及力学性能
Microstructure and mechanical properties of composite welded joints of high nitrogen steel
辛秀成 1黄根哲 1张今捷 1张宏 1王金钢1
作者信息
- 1. 长春理工大学机电工程学院,长春130022
- 折叠
摘要
Abstract
In order to study the microstructure and mechanical properties of welded joints of high nitrogen steel,high nitrogen steel plate with 8mm thickness was used as test material and Nd:YAG solid state laser with the rated power of 4kW was used to do laser-arc composite welding.The microstructure and fracture morphology of the welded joint were photographed and analyzed by a metallographic microscope and a scanning electron microscope.The microstructures of the base material,the heat affected zone and the welded zone were further analyzed in terms of element composition,content and phase composition by energy a spectrum analyzer and a X-ray diffractometer.The results show that the microstructure of the welded zone is typical dendrite and a small amount of equiaxial morphology.Both the base material and the heat affected zone are austenitic tissues.The welded zone is accompanied by a small amount of delta ferrite in addition to austenite tissues.The second phase particles in weld seam are mainly produced by metallurgical reaction in the form of TiO2,spinel(MnAl2O4)and silicate.It has obvious refinement to the grain and can increase the strength of weld seam.Tensile fracture occurs in the welded zone.Fracture morphology is typical of dimple fracture.The morphology of the cavity and the second phase particles can be found at the fracture.It is indicated that weld defects may lead to weak mechanical properties.The study lays a foundation for the application of laser-arc composite welding in the field of high nitrogen steel welding.关键词
激光技术/高氮钢激光-电弧复合焊接/微观组织/力学性能Key words
laser technique/high nitrogen steel laser-arc hybrid welding/microstructure/mechanical property分类
矿业与冶金引用本文复制引用
辛秀成,黄根哲,张今捷,张宏,王金钢..高氮钢复合焊接接头微观组织及力学性能[J].激光技术,2018,42(4):476-481,6.
