摘要
板坯连铸工艺中连铸辊承受交变热应力载荷,极易引发外辊面裂纹、剥落等失效问题,成为制约高效连续稳定成形的关键技术瓶颈,复合轧辊兼具耐高温与高强度等性能优势,有望成为该问题的有效解决途径,但是复合结构对服役性能的影响尚不清晰。基于Abaqus软件建立414N/42CrMo连铸复合辊等效服役瞬态有限元仿真模型,分析不同连铸板坯表面温度及不同覆层金属厚度对温度场分布的影响规律,研究表层温度梯度演变规律和高温敏感区范围,并对增材再制造连铸复合辊服役后的组织性能进行分析。研究结果表明,414N覆层与42CrMo基体因相近的热物性参数和相容性而无明显温度梯度,板坯表面温度变化对连铸复合辊整体温度场影响较大,板坯表面温度升高100℃,连铸复合辊表面温度平均升高35℃,覆层金属厚度变化主要影响连铸辊表层温度,高温敏感区的径向厚度为0~6 mm,随着与外辊面距离增加,温度峰值和温度变化幅值均降低;为确保外辊面具有良好的耐高温氧化腐蚀及抗热疲劳性能,需要控制熔覆层厚度为4~8 mm;服役后414N覆层组织呈现梯度分布特征,复合界面存在合金成分过渡区,拉剪试验断口位于42CrMo基体侧,表明复合界面结合强度高于基体剪切强度,证明实现完全冶金结合并在服役过程中保持良好结合状态。因此,研究结果为连铸复合辊制造与再制造过程中结构优化设计提供了理论支撑,助力钢铁资源循环再利用的实现。
In slab continuous casting processes,continuous casting rolls are subjected to alternating thermal-mechanical loads,which frequently lead to outer roll surface cracks,spalling,and other failures,posing a critical technical bottleneck to efficient and stable continuous forming.Composite rolls,combining high-temperature resistance and superior strength,offer a potential solution.However,the impact of composite structures on service performance remains unclear.A transient finite element model of 414N/42CrMo continuous casting composite rolls under simulated service conditions was established using Abaqus software to analyze the effects of varying slab surface temperatures and cladding thickness on temperature field distribution.The evolution of surface temperature gradients and the range of high-temperature sensitive zones are investigated,followed by structural optimization of the composite roll and post-service microstructural and mechanical property analysis of wire arc additive repaired continuous casting composite rolls.The results demonstrate that no significant temperature gradient exists between the 414N cladding and the 42CrMo substrate due to their similar thermophysical properties and compatibility.Variations in slab temperature significantly impact the overall temperature field of the composite roll,leading to an average surface temperature increase of approximately 35℃per 100℃rise in slab surface temperature.Conversely,changes in cladding thickness mainly influence the temperature within the surface layer of the continuous casting roll.The high-temperature sensitive zone has a radial thickness of 0-6 mm below the outer roll surface,where both the peak temperature and the temperature variation amplitude decrease with increasing distance from the roller surface.Controlling the remanufactured cladding thickness within the range of 4-8 mm is crucial to ensure excellent high-temperature oxidation corrosion resistance and thermal fatigue resistance of the outer roll surface.Post-service metallographic analysis revealed a progressive transition from boundary toward interior of the 414N cladding,followed by a distinct alloying element transition zone at the composite interface.Tensile-shear testing results showed fracture occurred within the 42CrMo substrate,indicating that the interfacial bonding strength exceeds the shear strength of the substrate material,confirming the achievement of complete metallurgical bonding and maintenance of good bonding integrity throughout service.Consequently,these findings provide theoretical support for the structural optimization design during the manufacturing and remanufacturing of continuous casting composite rolls,facilitating the recycling and reuse of iron and steel resources.
作者
季策
李浩政
邸鑫
李鹏瑞
陈晋峰
胡兵
马晓龙
黄华贵
JI Ce;LI Haozheng;DI Xin;LI Pengrui;CHEN Jinfeng;HU Bing;MA Xiaolong;HUANG Huagui(College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,Hebei,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,Hebei,China;Hai'an and Taiyuan University of Technology Advanced Manufacturing and Intelligent Equipment Industrial Research Institute,Hai'an 226601,Jiangsu,China;Tangshan Caofeidian Industrial Zone Changbai Mechanical and Electrical Equipment Maintenance Co.,Ltd.,Tangshan 063200,Hebei,China;Hebei Metallurgical Continuous Casting Equipment Remanufacturing Technology Innovation Center,Tangshan 063200,Hebei,China;Technology Center,Taiyuan Heavy Industry Co.,Ltd.,Taiyuan 030024,Shanxi,China;Sinosteel Xingtai Machinery and Mill Roll Co.,Ltd.,Xingtai 054025,Hebei,China;National Key Laboratory of High-Performance Roll Materials and Composite Forming,Xingtai 054025,Hebei,China)
出处
《中国冶金》
北大核心
2025年第11期101-111,共11页
China Metallurgy
基金
国家自然科学基金资助项目(52205406,52375390)
河北省自然科学基金资助项目(E2024203066,E2023203260)
河北省高等学校科学研究资助项目(BJ2025139)
海安太原理工大学先进制造与智能装备产业研究院开放研究基金资助项目(2024HA-TYUTKFYF018)。
关键词
板坯连铸
连铸辊
复合辊
有限元分析
温度场
覆层金属厚度
复合界面
slab continuous casting
continuous casting roll
composite roll
FEM
temperature field
cladding thickness
bonding interface
