摘要
在45钢试样表面采用真空熔覆法制得碳化钨／钴基合金复合涂层，按照45钢热处理工艺对复合涂层进行正火处理，并借助扫描电子显微镜、x射线衍射仪等先进的测试手段对复合涂层的组织结构和表面形貌进行观察分析。应用疲劳试验机对不同碳化钨含量的复合涂层进行弯曲疲劳试验。结果表明：复合涂层在正火处理后的弯曲疲劳强度大大提高，比熔覆状态合金涂层高150～200MPa；在高周疲劳时比正火45钢的疲劳强度高80MPa左右；正火处理后，含15％（质量分数）WC的复合涂层的弯曲疲劳强度最大；复合涂层的疲劳强度除与硬度相关外，还与复合涂层和45钢基体的界面结合强度、涂层内部缺陷等因素有关。
The WC-Co composite coating bonded strongly with 45 steel matrix was made by vacuum fusion sintering （VFS）, which were normalized according to the 45 steel heat treatment technology. The constitution and the morphology of the composite coating were observed and analyzed by SEM, X-ray diffraction meter and micro- hardness instrument. A series of experiments on the cobalt based composite coatings of the different tungsten carbide percentage were fulfilled by a fatigue machine. The results show that the bending fatigue strength of normalized WC/Co coatings is about 80MPa higher than that of the normalized 45 steel and that 150 N200MPa higher than that of VFS coatings without heat treatments in high cycle fatigue; the normalized coating with 15% tungsten carbide content possesses optimal corrosion resistance; The fatigue strength of the VFS coatings are influenced by the hardness, interracial strength etc.
出处
《粉末冶金技术》
CAS
CSCD
北大核心
2008年第3期192-195,共4页
Powder Metallurgy Technology
关键词
真空熔覆
正火
疲劳强度
钴基合金
碳化钨
VFS
homogenization treatment
fatigue strength
cobalt based alloy
tungsten carbide
