不锈钢表面渗铝层/ZrO_2复合涂层残余应力模拟
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摘要
目的研究不同制备工艺参数对渗铝层/ZrO_2复合涂层残余应力的影响。方法采用ANSYS 18.1软件中的Workbench模块,采用热力耦合的方法,对沉积过程中不同制备工艺参数下产生的残余应力进行数值模拟。结果保温时间由2 h增长至5 h,等效应力由895 MPa减小至862 MPa。沉积温度由400℃升高至700℃,等效应力由541 MPa增加至999 MPa。ZrO_2层厚度从2μm增加至14μm,等效应力由925 MPa减小至835 MPa,但是渗铝层-氧化锆层界面的剪切应力由59 MPa增加至101 MPa。基体厚度的变化对基体及渗铝层内的热应力影响不大,但对ZrO_2层有较大的影响,基体厚度由0.3 mm增加至0.8 mm,等效应力由745 MPa增加至850 MPa。渗铝层使等效应力由877 MPa减小至745 MPa,径向应力由-1235 MPa减小至-1072 MPa,剪切应力由105 MPa降低到89 MPa,轴向应力由-375 MPa减小至-312 MPa,其中ZrO_2层中的轴向应力改变明显,由-128 MPa减小至-39 MPa。结论增加渗铝保温时间,整个复合涂层的应力降低。沉积温度与室温相差越大,热匹配失衡越严重。ZrO_2层厚度增加,基体和渗铝层的应力均有升高,ZrO_2层内部除剪切应力稍增加外,其余应力均减小。基体厚度增加,ZrO_2层等效应力和径向应力均明显增大,因此应降低基体的厚度。渗铝层起到很好的缓冲作用。
The work aims to study the influence of different preparation parameters on the residual stress of aluminized layer/ZrO_2 composite coating.Workbench module in ANSYS 18.1 software was used to generate residual stress under different preparation parameters in the deposition process with thermal mechanical coupling.As the holding time increased from 2 h to 5h,the equivalent stress decreased from 895 MPa to 862 MPa;As the deposition temperature increased from 400℃to 700℃,the equivalent stress is increased from 541 MPa to 999 MPa;As the thickness of ZrO_2 layer increased from 2μm to 14μm,the equivalent stress decreased from 925 MPa to 835 MPa,but the shear stress at the interface of aluminized layer and zirconia layer increased from 59 MPa to 101 MPa.The change of the thickness of the substrate had little effect on the thermal stress in the subsubstrate and the aluminized layer,but had a great influence on the ZrO_2 layer.As the thickness of the substrate increased from0.3 mm to 0.8 mm,the equivalent stress increased from 745 MPa to 850 MPa.The aluminized layer reduced the equivalent stress from 877 MPa to 745 MPa,the radial stress decreased from-1235 MPa to-1022 MPa,the shear stress decreased from105 MPa to 89 MPa,and the axial stress decreased from-375 MPa to-312 MPa.The axial stress in the ZrO_2 layer changed significantly from-128 MPa to-39 MPa.Increasing the aluminizing holding time can reduce the stress of the whole composite coating;The greater the difference between the deposition temperature and the room temperature is,the more serious the thermal matching imbalance is;As the thickness of the ZrO_2 layer increases,the stresses of the matrix and the aluminized layer increase,and the stress in the ZrO_2 layer decreases slightly except for the shear stress.As the thickness of the substrate increases,the equivalent stress and radial stress of the ZrO_2 layer increase significantly,and the thickness of the substrate decrease.The aluminized layer plays a good buffering role.
The work aims to study the influence of different preparation parameters on the residual stress of aluminized layer/ZrO_2 composite coating.Workbench module in ANSYS 18.1 software was used to generate residual stress under different preparation parameters in the deposition process with thermal mechanical coupling.As the holding time increased from 2 h to 5h,the equivalent stress decreased from 895 MPa to 862 MPa;As the deposition temperature increased from 400℃to 700℃,the equivalent stress is increased from 541 MPa to 999 MPa;As the thickness of ZrO_2 layer increased from 2μm to 14μm,the equivalent stress decreased from 925 MPa to 835 MPa,but the shear stress at the interface of aluminized layer and zirconia layer increased from 59 MPa to 101 MPa.The change of the thickness of the substrate had little effect on the thermal stress in the subsubstrate and the aluminized layer,but had a great influence on the ZrO_2 layer.As the thickness of the substrate increased from0.3 mm to 0.8 mm,the equivalent stress increased from 745 MPa to 850 MPa.The aluminized layer reduced the equivalent stress from 877 MPa to 745 MPa,the radial stress decreased from-1235 MPa to-1022 MPa,the shear stress decreased from105 MPa to 89 MPa,and the axial stress decreased from-375 MPa to-312 MPa.The axial stress in the ZrO_2 layer changed significantly from-128 MPa to-39 MPa.Increasing the aluminizing holding time can reduce the stress of the whole composite coating;The greater the difference between the deposition temperature and the room temperature is,the more serious the thermal matching imbalance is;As the thickness of the ZrO_2 layer increases,the stresses of the matrix and the aluminized layer increase,and the stress in the ZrO_2 layer decreases slightly except for the shear stress.As the thickness of the substrate increases,the equivalent stress and radial stress of the ZrO_2 layer increase significantly,and the thickness of the substrate decrease.The aluminized layer plays a good buffering role.
引文
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[15]SUN Y H,DONG J,ZHAO P Z,et al.Formation and phase transformation of aluminide coating prepared by low-temperature aluminizing process[J].Surface and coatings technology,2017,330:234-240.
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[2]虞勇,李威龙,张建辉.低温各向同性热解炭涂层热应力有限元分析[J].杭州电子科技大学学报,2018,38(2):73-77.YU Yong,LI Wei-long,ZHANG Jian-hui.Finite element analysis of thermal stress of low temperature Isotropic pyrolytic carbon coating[J].Journal of Hangzhou Dianzi University(nawral Sciences),2018,38(2):73-77.
[3]郜健.氧化铝/氧化锆复合涂层的制备及其氢渗透性能研究[D].北京:北京有色金属研究总院,2014.GAO Jian.Investigation of preparation and hydrogen permeation properties of alumina/zirconia composite coating[D].Beijing:General Research Institute for Nonferrous Metals,2014.
[4]谢华,陈东,黄健萌.双涂层界面接触应力分析[J].表面技术,2014,42(2):1-5.XIE Hua,CHEN Dong,HUANG Jian-meng.Analysis of the contact stress at interface of double coatings[J].Surface technology,2014,42(2):1-5.
[5]刘红兵,陶杰,张平则,等.316L不锈钢基材防氚渗透Al2O3涂层残余热应力分析[J].核科学与工程,2007,27(2):126-132.LIU Hong-bing,TAO Jie,ZHANG Ping-ze,et al.Residual stresses of A12O3 tritium penetration barrier on 316Lstainless steel substrate[J].Chinese journal of nuclear science and engineering,2007,27(2):126-132.
[6]谢玲玲,陈文亮,牛亚然,等.C/C材料表面ZrB2-SiC功能梯度涂层残余应力分析[J].表面技术,2016,45(12):97-102.XIE Ling-ling,CHEN Wen-liang,NIU Ya-ran,et al.Residual stress in ZrB2-Si C functionally graded coating on C/Csubstrate[J].Surface technology,2016,45(12):97-102.
[7]DONG J,SUN Y H,DOU B S,et al.Preparation and characterization of aluminide/zirconia composite coatings by a three-step combined process[J].Surface and coatings technology,2018,354:184-193.
[8]HAIDER J,RAHMAN M,CORCORAN B,et al.Simulation of thermal stress in magnetron sputtered thin coating by finite element analysis[J].Journal of materials processing technology,2005,168(1):36-41.
[9]ABBAS M,GUO H B,RAMZAN S M.Comparative study on effect of oxide thickness on stress distribution of traditional and nanostructured zirconia coating systems[J].Ceramics international,2013,39(1):475-481.
[10]文政颖,时蕾,陈晓鸽,等.Sm2Ce2O7/8YSZ层残余热应力及隔热性能计算机模拟[J].表面技术,2015,51(8):23-28.WEN Zheng-ying,SHI Lei,CHEN Xiao-ge,et al.Computer simulation of residual stresses and thermal insulation property of Sm2Ce2/8YSZ thermal barrier coatings[J].Surface technology,2015,51(8):23-28.
[11]陈枭,纪岗昌,王洪涛.MoB/CoCr梯度涂层残余热应力ANSYS模拟分析[J].材料热处理技术,2012,41(10):146-148.CHEN Xiao,JI Gang-chang,WANG Hong-tao.Simulation and analysis of residual thermal stress of MoB/CoCr gradient coating[J].Material&heat treatment,201241(10):146-148.
[12]龙芬.Mo箔基体上金刚石薄膜的制备及残余应力的研究[D].长沙:中南大学,2014.LONG Fen.Study of preparation and residual stress of diamond films on Mo foil[D].Changsha:Central South University,2014.
[13]张昊明,李振军,桑玮玮,等.Sm2Ce2O7/YSZ功能梯度热障涂层的残余热应力[J].表面技术,2017,46(9):1-6.ZHANG Hao-ming,LI Zhen-jun,SANG Wei-wei,et al.Residual thermal stress of Sm2Ce2O7/YSZ functional graded thermal barrier coatings[J].Surface technology,2017,46(9):1-6.
[14]范世通,汤海波,张述泉,等.梯度复合材料热应力影响因素正交有限元分析[J].材料工程,2012(8):1-4.FAN Shi-tong,TANG Hai-bo,ZHANG Shu-quan,et al.Finite element analysis of factors to thermal stressin uradient composite with orthogonal method[J].Journal of materials engineering,2012(8):1-4.
[15]SUN Y H,DONG J,ZHAO P Z,et al.Formation and phase transformation of aluminide coating prepared by low-temperature aluminizing process[J].Surface and coatings technology,2017,330:234-240.
[16]ZHANG X C,XU B S,WANG H D,et al.Modeling of the residual stresses in plasma-spraying functionally graded ZrO2/Ni Co Cr Al Y coatings using finite element method[J].Materials&design,2006,27(4):308-315.