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采用激光合金化技术在38Cr Mo Al钢表面制备了不同Y2O3质量分数的纳米WC/Co-Y2O3合金化层。采用X射线衍射仪(XRD)、扫描电镜(SEM)、显微硬度计和摩擦磨损试验机,系统研究了Y2O3含量对合金化层组织和性能的影响。结果表明,不同Y2O3含量的合金化层主要是由马氏体、奥氏体、Fe3W3C和WC相组成。有所不同的是,随着Y2O3含量的增加,组织中Fe3W3C、纳米WC和奥氏体的相对含量逐渐增加,而马氏体的相对含量则逐渐减少;而当Y2O3质量分数超过1.0%时,纳米WC的数量开始降低,凝固组织略有粗化。受上述组织变化的影响,合金化层硬度与耐磨性随着Y2O3含量的增加而呈现出先增后降的趋势,即当Y2O3质量分数为1.0%时,合金化层具有最高的硬度和最佳的耐磨性能。
The nanocrystalline WC / Co-Y2O3 nanocrystallites with different mass fraction of Y2O3 were prepared on the surface of 38Cr MoAl steel by laser alloying. The effects of Y2O3 content on the microstructure and properties of the alloying layer were systematically investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), microhardness tester and friction and wear tester. The results show that the alloying layers with different content of Y2O3 mainly consist of martensite, austenite, Fe3W3C and WC phase. The difference is that with the increase of Y2O3 content, the relative content of Fe3W3C, nano-WC and austenite gradually increases while the relative content of martensite decreases gradually. When the mass fraction of Y2O3 exceeds 1.0% The amount of nano-WC began to decrease and the solidified tissue slightly roughened. The hardness and wear resistance of the alloyed layer showed a trend of first increasing and then decreasing with the increase of Y2O3 content under the influence of the above-mentioned organizational changes. That is, when the Y2O3 content is 1.0%, the alloying layer has the highest hardness and the best wear resistance Wear resistance.