Co-P合金镀层热疲劳裂纹萌生扩展的研究
Study on Incubation and Propagation of Thermal Fatigue Crack of Co-P Coating
张 焱1, 尤显卿2, 潘江锋2, 丁 峰1
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作者单位：1.安徽职业技术学院 机械工程系, 安徽 合肥 230011; 2.合肥工业大学 材料科学与工程学院, 安徽 合肥 230009
中文关键字：Co-P合金镀层； 热疲劳裂纹； 萌生； 扩展
英文关键字：Co-P alloy coating; thermal fatigue crack; incubation; propagation
中文摘要：对钢结硬质合金表面进行Co-P合金化学镀，对镀层进行25 ～680 ℃的热疲劳试验，研究了热疲劳裂纹在镀层的萌生与扩展特征。结果表明：热裂纹的出现包括孕育期、萌生期与扩展期； 热裂纹优先在镀层表面应力最集中的区域萌生；在热裂纹萌生和扩展的同时伴随着氧化腐蚀，氧化腐蚀缩短裂纹的孕育期，促进裂纹的萌生。
英文摘要：A Co-P alloy coating was done by electroless plating on the surface of steel bonded carbide, and the thermal fatigue testing of the coating was performed at 25 ～680 ℃. The characteristics of incubation and propagation of the thermal fatigue cracks in the coating were studied. The results show that the thermal cracks include incubation, incubation and propagation period. Thermal cracks nucleate preferentially in the area of the most stress concentrated in the coating. There is oxidation and corrosion in the incubation and propagation of cracks, which shorten the incubation period of crack and promote the crack to incubate.