不锈钢表面等离子渗锆改性层渗碳处理后的碳化物及硬度研究  

Research on Carbides and Microhardness of Plasma Zr Layer and Carburizing for Stainless Steel

作　　者：蔡航伟[1] 高原[1] 马志康[1] 王成磊[1] 

机构地区：[1]桂林电子科技大学材料科学与工程学院,广西桂林541004

出　　处：《热加工工艺》2013年第20期171-173,178,共4页Hot Working Technology

摘　　要：利用双辉等离子渗金属技术在0Cr18Ni9Ti不锈钢表面形成了厚约65μm、均匀致密连续的渗锆合金层,然后对渗锆后的试样进行920℃固体渗碳处理;并对不锈钢基材、渗锆试样及渗锆+渗碳后的试样分别进行硬度检测。结果表明:渗碳后,试样的表面硬度较基材及渗Zr试样均有显著提高,且试样由表及里,硬度呈逐渐降低趋势;920℃固体渗碳后,碳化物呈颗粒状弥散分布在渗层上,无共晶碳化物生成;渗碳层的物相为ZrC、Fe3C、FeC8、ZrFe2、ZrO2、Cr2O3、α-Fe、Fe-Cr、Cr1.36Fe0.52;且实际检测到的试样表面中的含碳量要比理论值略大。A continuous and compact zirconium modified surface alloying layer was prepared on 0Crl 8Ni9Ti stainless steel substrate by double-glow plasma surface alloying technology. Then the samples conducted by Zr surface alloying process were processed by solid carburizing at 920 ℃. The microhardness of stainless steel, Zr-alloyed layer and zirconizing ＋ carburizing were measured. The results show that the microhardness of the sample after carburizing process is higher than those of stainless steel and Zr-alloyed layer, and the microhardness of the sample decreases gradually from the surface to the inside. After the samples conducted by solid carburizing at 960 ℃, the granular carbides distribute dispersively and uniformly in alloying layer, and no eutectic carbide exists at the grain boundaries. The phases of carburized layer are ZrC,Fe3C, FeC8, ZrFe2, ZrO2, Cr203, α-Fe, Fe-Cr, Crl.36Fe0.52. The practical carbon content of the sample＇ surface is more than the theoretical.

关 键 词：双辉等离子渗金属 渗锆改性层 硬度 固体渗碳 碳化物 

分 类 号：TG156.8[金属学及工艺—热处理]