摘要
使用超音速等离子喷涂设备在45钢基体上制备了Fe基合金涂层,采用扫描电镜、透射电镜等设备对涂层组织结构进行了表征。以球盘式接触疲劳试验机为平台,考察了涂层在1.58、1.84、2.04 GPa 3种应力水平下的接触疲劳寿命。采用Weibull概率统计方法处理离散的接触疲劳寿命数据,建立了Weibull失效概率统计模型和失效概率-应力-疲劳寿命(P-S-N)曲线图。结果表明,涂层结构致密且呈典型的层状结构,涂层粒子结合界面平整;涂层粒子内部析出弥散分布的点状碳化物,而在边界处析出连续分布的片状碳化物;涂层微裂纹周围分布有强韧性极高的纳米晶;根据建立的Weibull失效概率统计模型和P-S-N曲线图,可以有效地预测涂层的接触疲劳寿命。
Fe-based alloy coating was prepared on 1045 steel by a supersonic plasma spraying device. Microstructure of the coating was characterized by using scanning electron microscopy （SEM） and transmission electron microscopy （ TEM）. Contact fatigue life of the coating under three stress levels of 1.58,1.84 and 2.04 GPa was researched on a ball-on-disk tester. The discrete data of contact fatigue life was processed using method of Weibull probability statistics,and it was constructed that Weibull failure probability statistic model and P-S-N curve. The results show that dense microstructure of the coating is characterized by the typical lamellar structure,and the interfaces among the coating particles are smooth. Spotted carbides particles precipitated in the coating are evenly distributed, but platy carbides precipitated in the interfaces of the coating particles are continuously distributed. High-strength and high-tenacity nanocrystals are distributed around the cracks within the coating. Contact fatigue life of the coating can be effectively predicted by Weibull failure probability statistic model and P-S-N curve.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2013年第9期167-172,共6页
Transactions of Materials and Heat Treatment
基金
"十二五"国家科技支撑计划课题(2011BAF11B08)
国家杰出青年科学基金(51125023)
