近疲劳强度载荷下WC/Co涂层对300M钢疲劳性能的影响

机械工程材料, 2006, 30(9): 44-47. doi: 10.3969/j.issn.1000-3738.2006.09.013

近疲劳强度载荷下WC/Co涂层对300M钢疲劳性能的影响

邓春明 ^1, , 周克崧 ^2, , 刘敏 ^3, , 宋进兵 ^4, , 伍超群 ^5, , 况敏 ^6,

1.广东工业大学材料与能源工程学院,广东,广州,510640;广州有色金属研究院材料表面中心,广东,广州,510651

2.广州有色金属研究院材料表面中心,广东,广州,510651

3.广州有色金属研究院材料表面中心,广东,广州,510651

4.广州有色金属研究院材料表面中心,广东,广州,510651

5.广东工业大学材料与能源工程学院,广东,广州,510640;广州有色金属研究院材料表面中心,广东,广州,510651

6.广州有色金属研究院材料表面中心,广东,广州,510651

关键词： WC/Co涂层 , 电镀铬层 , 疲劳强度

Influence of WC / Co Coating on Fatigue Performance of 300M Steel at Stress Level Close to Fatigue Limit

研究了在近疲劳强度载荷下超音速火焰喷涂WC/Co涂层和电镀铬层对300 M低合金钢疲劳性能的影响.结果表明:WC/Co涂层、电镀铬层试样和300 M钢基体的疲劳强度分别为753,600和720 MPa.在近疲劳强度载荷下,WC/Co涂层试样的疲劳寿命分别为基体和电镀铬层试样的1.5～2和5～10倍.三者的主裂纹源均为基体内部的Al2O3和SiO2夹杂物.电镀铬层中的次裂纹穿过界面并向基体中扩展,在基体表面形成新的次裂纹源,加快了基体中主裂纹源的形成和主裂纹的扩展;而WC/Co涂层中的次裂纹经过界面时向界面方向偏转,形成无支撑涂层,并最终使涂层剥落.

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