摘要
对不同闪光留量条件下510CL车轮钢闪光对焊接头组织和性能进行研究。结果表明:焊接热影响区含界面区、粗晶区、重结晶区、部分重结晶区四个部分,其中界面区维氏硬度最高,峰值硬度范围为201~219HV。闪光留量较小时,界面区主要为块状铁素体与粒状贝氏体;闪光留量适中时,界面区出现力学性能优异的针状铁素体组织;闪光留量过大会使接头处产生的热量过大,此时界面区主要为力学性能较差的魏氏体与粒状贝氏体组织,并出现错边现象。闪光对焊错边与魏氏体组织过多是焊接接头断裂的主要原因,为了获得性能良好的闪光对焊接头,闪光留量的合理设计范围为3.5~5.5 mm。
The effect of different flash allowances on the microstructure and mechanical properties of flash butt welded joint for 510CL wheel steel was investigated. The results indicate that the heat affected zone consists of interfacial zone, coarse grain zone, annealed zone and incomplete annealed zone. The Vickers hardness of interface area is the highest, and the peak hardness range is 201 - 219 HV. When flash allowance is lower, interface area mainly consists of blocky ferrite and granular bainite. When flash allowance is moderate, the interface area consists of acicular ferrite with excellent mechanical performance. Excessive flash allowance generates too much heat, and the interface area will mainly consist of widmanstatten structure and granular bainite with poor mechanical properties. The welded joint fracture may be ascribed to the existence of too much widmentstatten structure with high density of mismatch. In order to obtain flash butt joint with good performance, the reasonable range design of flash allowance is 3.5 - 5.5 mm.
作者
张洪博
谭峰亮
陈志国
ZHANG Hongbo TAN Fengliang CHEN Zhiguo(School of Materials Science andEngineering, Central South University, Changsha 410083, China Department of Mechanical and Electrical Engineering, Hunan University of Humanities, Science and Technology, Loudi 417000, China Postdoctoral workstation of VALINLYSteel Co.Ltd, Loudi 417000, China)
出处
《材料研究学报》
EI
CAS
CSCD
北大核心
2017年第2期152-160,共9页
Chinese Journal of Materials Research
基金
湖南省自然科学基金(2016JJ6045)~~
关键词
金属材料
闪光留量
闪光对焊
显微组织
力学性能
metallic materials, flash allowance, flash butt welding, microstructure, mechanical properties
