摘要
超大型支承辊再制造是保障中厚板轧制产业链安全与经济效益的关键环节,退火热处理作为再制造过程的核心工序,直接决定修复层的最终性能。本文针对当前超大型支承辊再制造中存在的修复层性能不稳定、服役寿命短等问题,采用埋弧堆焊技术制备Cr5钢修复层试样,系统研究了不同退火温度(原始态、450℃、650℃)对修复层拉伸性能、断口形貌和硬度的影响规律。研究结果表明:热处理温度对修复层性能影响显著,原始态时修复层抗拉强度最高,随着热处理温度升高,抗拉强度降低,延伸率提高,断口形貌分析表明随退火温度升高,塑性提升,断裂机制均为韧性断裂。该研究为制定高可靠性、长服役寿命的超大型支承辊再制造工艺规范提供了重要的实验依据。
The remanufacturing of ultra-large backup rolls constitutes a key link in ensuring the security and economic efficiency of the medium-to-heavy plate rolling industry.Within this process,annealing heat treatment serves as the core step that directly dictates the final performance of the repaired layer.To address prevalent issues such as unstable performance and short service life of the repaired layer in current remanufacturing practices,this study fabricated Cr5 steel repaired layer samples via submerged arc surfacing.A systematic investigation was conducted on the effects of different annealing temperatures(as-deposited,450℃,650℃)on the tensile properties,fracture morphology,and hardness of the layer.The results demonstrate a significant influence of annealing temperature.The as-deposited sample exhibited the highest tensile strength.With increasing temperature,the strength decreased while the elongation improved.Fractography indicated enhanced plasticity with higher annealing temperatures,with the fracture mechanism remaining ductile across all conditions.This work provides valuable experimental evidence and insights for establishing remanufacturing process specifications targeting ultra-large backup rolls with high reliability and prolonged service life.
作者
刘士彬
解俊
李浩政
季策
LIU Shibin;XIE Jun;LI Haozheng;JI Ce(Sinosteel Group Xingtai Machinery and Roll Co.,Ltd.,Xingtai 054025,China;State Key Laboratory of High Performance Roll Materials and Composite Forming,Xingtai 054000,China;College of Mechanical Engineering,Yanshan University,Qinhuangdao 066004,China;National Engineering Research Center for Equipment and Technology of Cold Strip Rolling,Yanshan University,Qinhuangdao 066004,China)
出处
《重型机械》
2026年第1期43-47,共5页
Heavy Machinery
基金
河北省中央引导地方科技发展资金项目(246Z1023G)
河北省自然科学基金项目(E2024203066)
河北省高等学校科学研究项目(CXZX2025057,BJ2025139)
邢台市重点研发计划项目(2025ZC001)。
关键词
超大型支承辊
再制造
热处理温度
修复层性能
ultra-large backup roll
remanufacturing
heat treatment temperature
repair layer properties
