超音速火焰喷涂WC-10Co4Cr涂层的高周疲劳损伤
High Cycle Fatigue Damage of HVAF WC-10Co4Cr Coating
摘 要
采用超音速火焰喷涂方法在300M钢基体上制备了WC-10Co4Cr涂层,对其和在300M钢上的电镀铬层进行了高周疲劳试验,采用SEM及EDS等对经高周疲劳后的涂层开裂和剥落机理进行了研究.结果表明:经过2/3疲劳寿命周次的高周疲劳后,WC-10Co4Cr涂层出现多条平行周向裂纹,裂纹与载荷方向垂直,为正断;试样疲劳断裂后,WC-10Co4Cr涂层断口附近有剥落,随载荷的增加,剥落面积增大;而电镀铬层在试样断裂后表面裂纹也不十分明显,高载荷下断裂后有少许镀层剥落.
电镀铬
高周疲劳
WC-10Co4Cr coating
chrome plating
high cycle fatigue
Abstract
The high cycle fatigue (HCF) properties of chrome plating and WC-10Co4Cr coating prepared by HVAF (high velocity air fuel) on 300M steel were tested.The crack and delamination mechanism of the coatings after HCF were analyzed by means of SEM and EDS.The results indicate that many parallel cracks,perpendicular to the loading direction,were found on WC-10Co4Cr coating after 2/3 HCF life,indicating normal fracture.Delamination of WC-10Co4Cr coating was observed near to the fracture surface after fatigue fracture,and with the increase of load,the delamination area increased.No obvious crack was found on chrome plating after fracture.There was a little delamination of the coating under high load.
中图分类号 TG115.5
所属栏目 试验研究
基金项目
收稿日期 2008/12/3
修改稿日期 2009/7/16
网络出版日期
作者单位点击查看
备注邓春明(1976-),男,江西黎川人,博士.
引用该论文: DENG Chun-ming,LIU Min,ZHOU Ke-song,SONG Jin-bing,XIAO Wei-hao. High Cycle Fatigue Damage of HVAF WC-10Co4Cr Coating[J]. Materials for mechancial engineering, 2010, 34(1): 1～4
邓春明,刘敏,周克崧,宋进兵,肖伟昊. 超音速火焰喷涂WC-10Co4Cr涂层的高周疲劳损伤[J]. 机械工程材料, 2010, 34(1): 1～4
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参考文献
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【3】BODGER B E,EMERY W A,SOMMERVILLE D A.An example of the decision making process for the evaluation of tungsten carbide thermal spray process as replacements for electrodeposited chrome plating[C]//Proceedings of the American Electroplaters and Surface Finishers Society (AESF) 33rd Aerospace/ Airline Plating and Metal Finishing Forum.Burlingame,California:The American Electroplaters and Surface Finishers Society,1997:207-216.
【4】SARTWELL B D,BRETZ P E.HVOF thermal spray coatings replace hard chrome[J].Advanced Materials Processes,1999,156(2):25-28.
【5】邓春明,周克崧,刘敏,等.近疲劳强度下WC/Co涂层对300M 低合金钢疲劳性能的影响[J].机械工程材料,2006,30(9):44-47.
【6】VERSTAK A,BARANOVSKI V,AC-HVAF sprayed tungsten carbide properties and applications [C]//Proceedings of the 2006 International Thermal Spray Conference.Washington:Seatle,2006.
【7】SAHRAOUI T,GUESSASMA S,FENINECHE N E,et al.Friction and wear behaviour prediction of HVOF coatings and electroplated hard chromium using neural computation[J].Materials Letters,2004,58(5):654-660.
【8】李长久,王豫跃,大森明.粉末结构对超音速火焰喷涂WC系金属陶瓷涂层结和强度的影响[J].中国表面工程,2000,4(2):1-4.
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【10】QIAO Yun-fei.Mechanical and tribological properties of thermally sprayed WC-Co coatings[D].New Jersey:Steven Institute of Technology,2001.
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