Mo和Ni对Cr12MoV轧辊表面Fe90熔覆层冲击韧性和耐磨性的影响  

Effect of Mo and Ni on Impact Toughness and Wear Resistance of Fe90 Cladding Layer on Cr12MoV Roller Surface

作　　者：杨仁人 刘立培 林英华[1,2] 彭龙生 王新林 Yang Renren;Liu Lipei;Lin Yinghua;Peng Longsheng;Wang Xinlin(College of Mechanical Engineering,University of South China,Hengyang 421001,Hunan,China;Hunan Province Key Laboratory for Ultra-Fast Micro/Nano Technologyand Advanced Laser Manufacture,Hengyang 421001,Hunan,China;Hunan Lifang Roller Co.,Ltd.,Hengyang 421681,Hunan,China;Hunan High Wear Resistant Alloy Material Advanced Manufacturing Engineering Technology Research Center,Hengyang 421681,Hunan,China)

机构地区：[1]南华大学机械工程学院,湖南衡阳421001 [2]超快微纳米技术与激光先进制造湖南省重点实验室,湖南衡阳421001 [3]湖南力方轧辊有限公司,湖南衡阳421681 [4]湖南省高耐磨合金材料先进制造工程技术研究中心,湖南衡阳421681

出　　处：《中国激光》2024年第20期138-151,共14页Chinese Journal of Lasers

基　　金：福建省技术创新重点攻关及产业化项目(2023XQ017);湖南省自然科学基金-省市联合基金(2022JJ50019);衡阳市指导性计划项目(hyzdxjh202101);南华大学人才引进项目(210XQD017)。

摘　　要：损伤Cr12MoV冷轧工作辊的激光修复需要实现熔覆层性能恢复至与原母材性能相当,然而,采用激光熔覆Fe90合金粉末制备的熔覆层的冲击韧性、耐磨性与Cr12MoV冷轧工作辊性能存在差异。本课题组在Fe90合金粉末的基础上,通过添加一定的Mo和Ni元素来解决熔覆层冲击韧性和耐磨性不足的问题。结果表明:Mo和Ni添加前,Fe90熔覆层的显微组织主要为包覆等轴晶和柱状晶的类网状组织,晶粒度为5.47μm,物相为α-(Fe,Cr)和M_(7)C_(3),显微硬度、冲击吸收能(带基底)、磨损量和摩擦因数分别为795.71 HV、2.37J/cm^(2)、0.8 mg和0.75;共同添加Mo和Ni后,熔覆层的显微组织主要为包覆等轴晶的类网状组织,晶粒度降低至5.28μm,α-(Fe,Cr)物相含量降低,Mo_(2)C硬质相含量提高,显微硬度、冲击吸收能(带基底)、磨损量和摩擦因数分别为689.92 HV、2.74 J/cm^(2)、0.4 mg和0.65。Mo和Ni的共同添加使得熔覆层的冲击韧性和耐磨性都得以提高,这主要得益于Mo_(2)C耐磨相含量提高、晶粒细化以及Cr偏析率降低的协同作用。Objective The Cr12MoV roller is commonly used in rolling mills for rolling stainless steel sheets owing to its good impact toughness and wear resistance.However,surface spalling,sticking roller,and cracking inevitably occur during service of Cr12MoV rollers,which will consequently undergo damage.Currently,the most frequently used methods for remanufacturing and repairing Cr12MoV rollers are surfacing,thermal spraying,and laser cladding.Laser repair is a high-performance method for repairing damaged rollers because it produces dense tissue and metallurgical bonding at the interface.Thus,it has become an important technique for repairing damaged Cr12MoV rollers.The process of repairing damaged Cr12MoV cold rollers with lasers requires the restoration of the properties of the cladding layer for them to be comparable to those of the original base material.However,the impact toughness and wear resistance of the Fe90 alloy cladding prepared using laser cladding technology differ from those of the Cr12MoV cold rolling work roller.This study aims to 1)address the issue of insufficient impact toughness and wear resistance of the fusion cladding layer by adding a certain amount of Mo and Ni to the Fe90 alloy powder,and 2)provide a reference for repairing damage to Cr12MoV rollers.Methods First,the surface and internal cracks of cladding layers with different Mo and Ni contents were characterized.The presence of red lines on the surface of the cladding layer was used to determine the formation of cracks,which were mainly based on the permeation,capillary action,and adsorption principles of the testing agent.The internal cracks were identified by longitudinally and transversely intercepting,grinding,and polishing the fused cladding at different locations.Second,we investigated the effects of different Mo and Ni contents on the microstructure,physical phase composition,and elemental distribution of the fused cladding layers.XRD,SEM,and EDS surface and spot scans were used for this purpose.The lattice stress field of each fuse

关 键 词：激光熔覆 Cr12MoV轧辊 微观组织 硬度 耐磨性 冲击韧性 

分 类 号：TG142.1[一般工业技术—材料科学与工程]