焊接速度对2205不锈钢激光焊接热循环及组织的影响
Effect of Welding Speed on the Thermal Cycle and Microstructure of During Laser Welding of 2205 Stainless Steel
杨景卫 1李涛 1李政 1陈嘉乐 1乔健1
作者信息
- 1. 佛山科学技术学院机电工程与自动化学院,广东佛山 528000
- 折叠
摘要
采用比色高温计对2205双相不锈钢激光焊接熔池的热循环进行实验检测,研究不同焊接速度下凝固过程冷却速率与固相冷却速率的变化趋势,并分析熔池凝固过程对焊缝微观组织结构及显微硬度的影响.结果表明,焊缝截面形貌均呈现"钉"形,焊缝熔宽、熔深及截面面积随着焊接速度的增大而减小;熔池凝固过程中冷却速率随着焊接速度的增大而显著增大,致使焊缝晶粒发生明显的细化,并且焊缝中心的晶粒形态从等轴晶逐渐演变为柱状晶;随着焊接速度的增大,固相冷却速率逐渐增大,致使析出相的析出数量减少;焊缝均发生了硬化,平均显微硬度随焊接速度的增大而增大.
Abstract
In this paper,a colorimetric pyrometer was used to determine the molten pool thermal history parameters in laser welding of 2205 duplex stainless steel.The cooling rate of solidification under different welding speed was investigated.The effect of molten pool thermal history on the microstructure and microhardness of the joints was studied.The weld morphologies present a"nail"shape.With an increase in welding speed,the width,depth and section area of the joints were found to de-crease,while the cooling rate increases.As a result,the grains were refined obviously.Further,the grain morphology in the center of the weld evolves from equiaxed grains to columnar grains.The solid phase cooling rate increases with the welding speed,resulting in a decreasement of the precipitated phase.All the welds are hardened,and the average microhardness increa-ses with the welding speed.
关键词
激光焊/2205双相不锈钢/热循环/微观组织Key words
laser welding/2205 duplex stainless steel/thermal cycle/microstructure引用本文复制引用
基金项目
国家自然科学基金(51805084)
国家自然科学基金(52265062)
广东省教育厅科技项目(2022KTSCX125)
季华实验室科技计划(X220391TH220)
出版年
2024
NETL
NSTL
万方数据