摘要
某载重货车制造企业在焊接、加工组装车厢中梁的过程中发现YQ450NQR1乙字钢腿部“舌状”裂纹,采用显微组织分析、缺陷宏观形貌观察、能谱分析和化学成分测试等系统检测方法分析了裂纹形成原因。结果表明:冶炼过程钢水液面波动使铸坯产生振痕,铸坯的强冷和脆性区矫直形成了铸坯微裂纹,有缺陷的铸坯进入加热炉后,由于升温速度过快,炉温高且停留时间长,裂纹继续扩大,恶化的横向裂纹在沿纵向轧制时形成“舌状”裂纹。
A certain heavy-duty truck manufacturing enterprise discovered“tongue-shaped”cracks in the leg of YQ450NQR1 H-section steel during the welding,processing,and assembly of the middle beam of the truck body.The cause of crack formation was analyzed using systematic detection methods such as microscopic structure analysis,defect macro morphology observation,energy spectrum analysis,and chemical composition testing.The results show that the fluctuation of the steel liquid level during the smelting process causes oscillation marks on the slab,and the severe cooling and straightening of the brittle zone in the slab lead to the formation of micro-cracks.When the defective slab enters the heating furnace,the cracks continue to expand due to the rapid heating rate,high furnace temperature,and long dwell time,and the aggravated transverse cracks form“tongue-shaped”cracks during rolling along the longitudinal direction.
作者
冯岩青
吴娟
张世忠
王厚昕
赵一臣
Feng Yanqing;Wu Juan;Zhang Shizhong;Wang Houxin;Zhao Yichen(Baotou Vocational&Technical College,Baotou,Inner Mongolia 014030;CITIC Metal Co.,Ltd.,Beijing,100004;Hebei Provincial Academy of Building Steel Structure Industry Technology,Tangshan,Hebei 064001)
出处
《包头职业技术学院学报》
2023年第2期1-4,共4页
Journal of Baotou Vocational & Technical College
基金
包头职业技术学院基金项目“包头职业技术学院2022科研创新团队《新材料工艺改进及性能控制》”(KJ202104)成果。
关键词
高强耐候
YQ450NQR1
裂纹
连铸
加热
High-Strength Weather-Resistant
YQ450NQR1
Cracks
Continuous Casting
Heating
