| Cr7C3 / Ni3Al 复合材料制备过程中碳化铬的溶解再析出行为 |
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| 引用本文： | 李尚平,冯涤,骆合力,刘君秋.Cr7C3 / Ni3Al 复合材料制备过程中碳化铬的溶解再析出行为[J].复合材料学报,2005,22(4):53-57. |
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| 作者姓名： | 李尚平 冯涤 骆合力 刘君秋 |
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| 作者单位： | 钢铁研究总院高温材料研究所, 北京 100081 |
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| 基金项目： | 国家高技术研究发展计划项目（2002AA331070） |
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| 摘 要： | 将真空常压烧结方法制得的Cr3C2-Ni2Al 复合焊丝堆焊于碳钢表面。分析表明, 在堆焊过程中, 利用氩弧物理热和Ni-Al 反应热, Ni 与Al 化合反应生成Ni3Al 金属间化合物, Cr3C2 则发生分解, 除少部分 C]与Cr ]固溶于Ni3Al 基体中外, 大部分反应析出更稳定的Cr7C3 相, 其尺寸取决于堆焊层中不同区域的冷却环境,较为均匀地分布于Ni3Al 基体中。由于Cr 在Ni3Al 中的固溶度远大于C , 加之Cr3C2 转化为Cr7C3 也造成部分富余的C , 结果造成在该Ni3Al 表面强化材料焊层中形成石墨相, 其密度轻、熔点高, 主要偏聚于焊层表层。Cr7C3 / Ni3Al 复合材料的室温、高温硬度远高于传统高温耐磨材料Stellite 合金, 该材料有望成为一种新型的高温耐磨表面强化材料。
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| 关 键 词： | Ni3Al 碳化铬 高温耐磨 溶解 析出 |
| 文章编号： | 1000-3850（2005）04-0053-05 |
| 收稿时间： | 09 7 2004 12:00AM |
| 修稿时间： | 2004-09-07 |
SOLUTION AND PRECIPITATION OF CHROMIUM CARBIDE DURINGTHE FABRICATED PROCESS OF Cr7C3 / Ni3Al COMPOSITE |
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| Li Shangping,FENG Di,LUO Heli,LIU Junqiu.SOLUTION AND PRECIPITATION OF CHROMIUM CARBIDE DURINGTHE FABRICATED PROCESS OF Cr7C3 / Ni3Al COMPOSITE[J].Acta Materiae Compositae Sinica,2005,22(4):53-57. |
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| Authors: | Li Shangping FENG Di LUO Heli LIU Junqiu |
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| Affiliation: | High Temperature Materials Research Institute, Cent ral Iron and Steel Research Institute, Beijing 100081, China |
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| Abstract: | A Cr3Cz-Ni-Al welding wire was produced by pressureless sintering process in vacuum. When the welding wires were welded on the surface of carbon steel, carbide particles reinforced Ni3Al base composite was formed due to the physical heat of arc and Ni-Al exothermic reaction. XRD shows that Ni reacts with Al to form Ni3Al and Cr3C2 is dissolved during welding. Most of Cr] and C] react to form Cr2C3 phase except that a few dissolve into Ni3Al matrix. The size of Cr7C3 particles mainly depends on the cooling rate of different welding regions.In addition, as the solid solubility of Cr in Ni3Al is much larger than that of C and Cr3C2 changes to Cr7C3 during welding, some graphites are formed in welding layers. The graphites mainly segregate on welding outer layers due to its low density and high melting point. The room and high temperature hardness of Cr7C3/ Ni3Al composite ismuch higher than that of stellite alloys. It is predicted that Cr7C3/ Ni3Al composite may become an attractive potential candidate for high-temperature surface wear-resistant material. |
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| Keywords: | Ni3Al chromium carbide high temperature wear resistance solution precipitation |
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