摘要
目的明确轴套、衬瓦间锌腐蚀-磨损的交互作用机制对合理选材、有效控制磨损的重要意义。方法使用陶瓷纤维马弗炉将纯锌粒加热到460℃后,对轴套、衬瓦试样进行液锌浸蚀试验,利用Ansys模拟出三辊轴套、衬瓦间的接触应力,采用多功能磨损试验机测出试样的摩擦系数以及磨损量,使用三维视频显微镜观察试样的三维形貌,使用扫描电镜对试样进行表面形貌观察和微观组织分析。结果当316L不锈钢试样浸入高温锌液1 h后,可以看到基体外表面出现多个合金层,总厚度达600~800μm。在带钢张力20 kN,矫正辊插入量10 mm的常见工况下,沉没辊轴套、衬瓦间接触应力可达65.14 MPa,稳定辊轴套、衬瓦间接触应力可达17.79 MPa,矫正辊轴套、衬瓦间接触应力可达26.69 MPa。无渗锌处理,垂直施加载荷为81 N时,在900 s以后摩擦系数稳定到0.03;当载荷为154.5 N时,摩擦系数维持在较低水平。渗锌处理时,无论载荷是81 N还是154.5 N,摩擦系数均在0.1上下波动。渗锌处理并加入硬质锌渣时,摩擦系数进一步的升高,波动幅度更大。无论施加的垂直施加载荷是81 N还是154.5 N,磨损量在无渗锌处理、渗锌处理、渗锌处理并加入硬质锌渣3种工况下依次递增。结论316L不锈钢经高温渗锌腐蚀形成的渗锌层、硬质锌渣显著提升了轴套、衬瓦间的摩擦系数以及磨损量,使表面低硬度合金层快速磨损。磨损磨去合金层,使新鲜基体持续暴露,促进了高温锌腐蚀的持续进行,不断形成新的腐蚀层,又不断被磨损掉,两者间的交互协同使得不锈钢轴套磨损速率提高而迅速失效。
It is of great significance to clarify the interaction mechanism of zinc corrosion and wear between sleeves and bushings for rational selection of materials and effective control of wear.The ceramic fiber muffle furnace was used to heat the pure zinc particles to 460℃,then the liquid zinc etching test was conducted on the sleeve and bushing samples.Ansys was applied to simulate the contact stress between the sleeves and the bushings of three rolls.A MFT3000 multifunctional wear tester was used to measure the friction coefficient and wear amount of the samples.A Hirox-7700 three dimensional video microscope was adopted to observe the three-dimensional morphology of the samples.A JSM-6510LV scanning electron microscope was used to analyze the microstructure and observe the surface morphology.When the 316L stainless steel samples were immersed in high temperature zinc solution for 1 h,there were several alloy layers on the external surface of the substrate,with a total thickness of 600-800μm.When the tension of the strip steel was 20 kN and the insertion amount of the correction roll was 10 mm,the contact stress between the sleeves and the bushings of the sink roll,the stabilizing roll and the correction roll could reach 65.14 MPa,17.79 MPa and 26.69 MPa respectively.For the friction coefficient between the sleeves and the bushings under the three working conditions,the following contents could be known.When the vertical applied load was 81 N,the friction coefficient was high at the initial wear stage without the zinc penetration treatment,but it was stable to 0.03 after 900 s.When the vertical applied load rose to 154.5 N without zinc penetration treatment,the friction coefficient remained extremely low.After the zinc penetration treatment,it could be found that the friction coefficient fluctuated around 0.1 whether the vertical applied load was 81 N or 154.5 N.When the hard zincilate particles were added to the zinc penetration treatment,the friction coefficient would be further increased,and the fluctuation range of the friction coefficient would be greater.Whether 81 N or 154.5 N was applied vertically,the wear amount increased in turn under three working conditions:no zinc penetration treatment,zinc penetration treatment,zinc penetration treatment and hard zincilate particles addition.After high temperature galvanizing corrosion,316L stainless steel could form multiple alloy layers structures on its surface.From the outside to the inside of the corrosion layer formed,they were theηphase,theζphase,theδ1 phase,and theγphase.The Cr rich layer on the surface of the stainless steel substrate could limit the expansion of the sherardizing layer,but the sherardizing layer formed could significantly improve the friction coefficient and wear amount between the sleeves and the bushings,which made the low hardness alloy layer on the surface wear rapidly.When the hard zincilate particles were further involved in the wear,they would be pressed into the surface of the sleeve and damage the surface,so that the friction coefficient would fluctuate significantly and the wear amount would further increase.The wear between the sleeves and the bushings in the hot-dip galvanizing line belongs to the mixed wear of adhesive wear,corrosion wear and abrasive wear.The abrasion removes the alloy layer,which makes the fresh substrate continuously be exposed and continue to generate new alloy layer.The mutual cooperation between the two makes the wear rate of stainless steel increase and the sleeves lose efficacy rapidly.
作者
饶思贤
左竞成
黄国辉
石亚飞
王孝义
RAO Si-xian;ZUO Jing-cheng;HUANG Guo-hui;SHI Ya-fei;WANG Xiao-yi(China International Science and Technology Cooperation Base on Intelligent Equipment Manufacturing in Special Service Environment,Department of Mechanical Engineering,Anhui Polytechnic University,Anhui Maanshan 243032,China;Hefei General Machinery Research Institute,Hefei 230031,China)
出处
《表面技术》
EI
CAS
CSCD
北大核心
2023年第6期266-275,共10页
Surface Technology
基金
安徽省教育厅重大自然科学研究项目(KJ2016SD09)
安徽省自然科学基金(1908085ME148)
特殊服役环境的智能装备制造国际科技合作基地开放基金(ISTC2021KF02)。
关键词
热镀锌线
沉没辊系统
轴套衬瓦
锌腐蚀
混合磨损失效
hot-dip galvanizing line
sink roll system
sleeves and bushings
zinc corrosion
mixed wear failure
