摘要
本文分别在钢(45碳素钢、1Cr18Ni9Ti不锈钢)和钛(Ti6A14V钛合金)基材上实施了NiCrBSi粉末的火焰喷焊,用SEM-EDAX和XRD研究了覆层的元素分布、界面相和表层相组成。结果表明:钢基材与覆层之间几乎没有发生元素扩散,基材元素扩散到覆层中的距离不到3μm,而钛基材与覆层之间发生了剧烈的元素扩散,基材元素扩散到覆层表层(距离约1 mm)。钛基材与覆层之间的界面上生成大量的低熔点物相NiTi_2,而扩散到覆层表层的钛元素改变了表层的相组成,增加了表层的非平衡度和硬度。基于相图对导致覆层出现巨大差异的机理进行了讨论。
Flames spray-welding of NiCrBSi powders on Fe-0.45C carbon steel, 1Cr1 8Ni9Ti stainless steel and Ti-6Al-4V titanium alloy substrate was performed, and the element distribution and the phase constituent of interface and surface for the coating were determined using SEM-EDS and XRD. Results show that the element diffusion between steel （Fe-0.45C, 1Cr1 8Ni9Ti） substrate and its coating is little, with the diffusion distance of less than 3 μm. On the other hand, the element diffusion between titanium substrate and its coating is considerably violent, with the diffusion up to top layer of coating, a distance of about 1 mm, leading to the formation of NiTi2 interface phase, the variation of phase constituents and the refinement of microstructure, and consequently increasing the micro-hardness of top layer of coating. The mechanism involved in the difference in coating was discussed based on Fe-Ni and Ti-Ni phase diagram.
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2007年第B08期259-262,共4页
Transactions of Materials and Heat Treatment
基金
江苏省材料摩擦学重点实验室基金(kjsmcx06005)
江苏省重点自然科学基金(BK2007707)
