南京航空航天大学学报2025，Vol.57Issue(1)：66-72,7.DOI:10.16356/j.1005-2615.2025.01.006
转向架用P355NL1钢MAG多层焊微观组织及温度场分析
Microstructure and Temperature Field Analysis of MAG Multi-layer Welding of P355NL1 Steel for Metro Bogies
尤君 1罗涛 1刘睿祖 2王建峰2
作者信息
- 1. 中车南京浦镇车辆有限公司,南京 210031
- 2. 南京航空航天大学材料科学与技术学院,南京 211106
- 折叠
摘要
Abstract
To further enhance the metal active gas(MAG)multi-layer welding quality of P355NL1 steel used in metro bogies,this paper conducts the MAG multi-layer welding tests of the butt joint of P355NL1 steel metro bogies,analyses the macro and micro morphologies of the butt joint structure,focuses on the study of the weld and the organisation of the heat-affected zone of each layer,establishes a MAG multi-layer welding model of the butt joint and performs calibration,and studies the distribution law of the temperature field of the MAG multi-layer welding.The results indicate that in the MAG multi-layer welding experiment,the heat input from the subsequent weld passes two phase transformations and recrystallization,which disrupts the columnar grain structure in the previous weld pass.This process leads to the refinement of the grain structure,forming fine ferrite grains and a small amount of pearlite.The double ellipsoid heat source model effectively simulates the welding process of P355NL1 steel in MAG multi-layer welding.The maximum temperature significantly increases during the welding of the upper layers.Therefore,controlling the welding temperature of the filler layers is crucial for grain refinement in multi-layer welding processes.关键词
MAG多层焊/地铁转向架/微观组织/温度场Key words
metal active gas(MAG)multi-layer welding/metro bogies/microscopic organization/temperature field分类
金属材料引用本文复制引用
尤君,罗涛,刘睿祖,王建峰..转向架用P355NL1钢MAG多层焊微观组织及温度场分析[J].南京航空航天大学学报,2025,57(1):66-72,7.
