摘要
采用真空电子束扫描以Cr3C2与铁的混合粉为原料在低合金钢表面熔覆制备了（Cr，Fe）7C3／γ-Fe合金层，对合金层进行了金相、X射线衍射和扫描电镜分析以及显微硬度测试和室温干滑动磨损试验。结果表明：合金层的组织均匀细小，由枝状晶奥氏体相和共晶碳化物相组成；合金层的显微硬度达到950-1050HV，约为基材显微硬度（360HV）的2．6～3．2倍；相对于基材，合金层的耐磨性能提高了5．2倍；合金层只有轻微的摩擦划痕，为磨粒磨损；而基材有片状剥落，属典型的粘着磨损。
Cr3 C2 and Fe powder mixtures were employed as raw material to prepare on the surface of a low alloy steel substrate with vacuum electron beam scanning. The alloy layer was analyzed by using optical microscopy, XRD, SEM, microhardness tesing and wear resistance testing under dry sliding condition. The results show that the alloy layer had a uniform and refined mierostructure. It was mainly composed of eutectic carbide phase and dendritic austenite phase. Microhardness of the layer reached 950--1 050 HV, about 2. 6--3. 2 times higher than that of the substrate（360 HV）. The relative wear resistance of alloy layer was increased 5. 2 time of substrate. There were only shallow friction in the worn surface of allooy layer, indicating an abrasive wear mechanism. While there were exfoliations in the worn surface of suhstrate, indicating adhesive wear.
出处
《机械工程材料》
CAS
CSCD
北大核心
2009年第9期10-12,16,共4页
Materials For Mechanical Engineering
