摘要
通过双层辉光等离子技术在TA15钛合金表面制备了渗Cr层和Cr-Si复合渗层。采用扫描电镜(SEM)、能谱仪(EDS)和X射线衍射(XRD)等手段研究了渗层的微观结构、成分分布及相结构。此外,还测定了渗层与基体金属的结合强度、纳米压痕硬度和弹性模量。结果表明,40μm厚的CrSi复合渗层均匀、致密,且大致可分为三部分;而渗Cr层则由12μm的Cr沉积层和18μm的扩散层组成。Cr-Si复合渗层的硬度和弹性模量分别为16 306 MPa和519 GPa,远大于渗Cr层的6 750MPa和364 GPa。在300℃进行了高温球盘磨损试验,以研究渗层的高温摩擦学行为。结果表明,Cr-Si复合渗层的磨痕比渗Cr层更窄更浅,摩擦因数和比磨损率也更小。
Cr layered layer and Cr-Si plasma surface metallurgy technology. co-alloyed layer were prepared on TA15 titanium alloy by a double glow The microstructure, composition distribution and phase structure of the layers were investigated by means of scanning electron microscope （ SEM）, energy dispersive spectrometer （EDS） and X- ray diffraction （XRD）. Besides, the adhesion of the layer to the basis metal, nanoindentation hardness and elastic modulus of the two layers also were measured. The results show that the 40 μm-thick Cr-Si co-alloyed layer is dense and even, and composed of three zones, whereas the Cr alloyed layer is composed of 12 μm-thick Cr-deposited zone and 18 μm-thick diffusion zone. The hardness and elastic modulus of the Cr-Si co-alloyed layer are respectively 16 306 MPa and 519 GPa, whereas ones of the Cr alloyed layer are respectively 6 750 MPa and 364 GPa, with the former being significantly greater than the latter. Ball disk milling tests at 300 ℃ were performed to investigate high temperature tribological behaviors of the layers. From this investigation it is seen that the Cr-Si co-alloyed layer exhibits narrower and shallower wear marks, and lower friction coefficient and specific wear rate as compared with the Cr alloyed layer.
出处
《热处理》
CAS
2017年第3期9-17,共9页
Heat Treatment
