摘要
通过离心铸造法获得了WCp/Fe-C再生复合材料圆环铸件,利用光学显微镜、扫描电镜、EDAX电子能谱仪及X射线衍射仪分析了再生复合材料组织中增强相的分布、形态及基体组织。结果表明,在试验条件下,圆环试样组织中WCp沿径向偏聚于外侧,形成由表面10～15mm厚的WCp/Fe-C复合材料工作层和芯部Fe-C合金基体层组成的复合结构试样。通过对比发现,离心转速越大,WCp向工作层偏聚的趋势就越大。环形试样工作层组织中,大量未溶WCp均匀地分布于贝氏体基体中,并有少量枝状碳化物析出;在中间过渡层中,WCp体积含量急剧下降,并出现细小的WCp层;在芯部Fe-C合金贝氏体基体上,原位析出短杆状碳化物及网状碳化物,并含有少量球状石墨。
Ring WCp/Fe-C recycled composites castings were prepared by centrifugal casting,and distribution and morphology of reinforcement as well as microstructure of the alloy matrix were analyzed by optical microscope,JSM-5160LV scanning electron microscope (SEM) and EDAX electron spectrometer and XRD (X-ray diffraction).The results show that WC particles are gathered in the outer layer along the radial direction of the sample under the experiments,leading to the formation of compound structural sample which consists of WCp/Fe-C composites working layer with 15 mm in thickness and Fe-C alloy matrix in core.It is found that the increase of rotating speed of centrifugal machine is beneficial to the gathering of WCp in the working layer.Microstructure of the as-cast sample exhibits as follows:in the working layer,a large amount of un-dissolved WCp with a little in-situ formed dendritic carbides are uniformly distributed into the bainite matrix;in the transition layer,the volume fraction of WCp is decreased sharply and a fine WCp layer is observed;in the core matrix layer,in-situ short-rod carbide and net-like carbide with little spheroidal graphite are created.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第5期441-443,共3页
Special Casting & Nonferrous Alloys
基金
河南省科技发展项目(0524250022)
