| Fe-Cr-Ti-C系药芯焊丝熔覆层中硬质相生长模式 |
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| 引用本文： | 孟凡玲,张桂清,苏允海.Fe-Cr-Ti-C系药芯焊丝熔覆层中硬质相生长模式[J].焊接学报,2015,36(3):93-96. |
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| 作者姓名： | 孟凡玲 张桂清 苏允海 |
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| 作者单位： | 1.沈阳理工大学 材料科学与工程学院, 沈阳 110159 |
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| 基金项目： | 辽宁省教育厅重点实验室资助项目(2008S164);沈阳市科技攻关资助项目(20082647-2) |
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| 摘 要： | 将Fe-Cr-Ti-C系耐磨药芯焊丝采用钨极氩弧焊堆焊到低碳钢表面,分析熔覆层中的物相组成,研究熔覆层中硬质相的形态分布和生长机理,探究熔覆层的耐磨性及表面硬度等力学性能变化的原因. 结果表明,药芯堆焊焊丝中的合金元素的过渡系数很高,可原位合成(Fe,Cr)7C3和TiC硬质相,TiC优先依附外来界面行核、长大,共晶(Fe,Cr)7C3硬质相则依附于初生马氏体相和TiC形核生长,点状TiC硬质相(少数为条状和十字状)弥散分布于马氏体、残余奥氏体的基体中,与网状的(Fe,Cr)7C3耐磨框架组成复合硬质相,提高熔覆层的耐磨性.
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| 关 键 词： | 耐磨药芯焊丝 原位合成 硬质相 生长机理 |
| 收稿时间： | 2014/8/2 0:00:00 |
Growth model of hard phase in layer surfaced with Fe-Cr-Ti-C flux cored wire |
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| MENG Fanling,ZHANG Guiqing and SU Yunhai.Growth model of hard phase in layer surfaced with Fe-Cr-Ti-C flux cored wire[J].Transactions of The China Welding Institution,2015,36(3):93-96. |
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| Authors: | MENG Fanling ZHANG Guiqing and SU Yunhai |
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| Affiliation: | 1.School of Material Science and Engineering, Shenyang Ligong University, Shenyang 110159, China2.School of Material Science and Engineering, Shenyang University of Technology, Shenyang 110870, China |
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| Abstract: | The Fe-Cr-Ti-C series of wear-resistant flux cored wire was surfaced on low carbon steel by GTAW method. The phase composition, distribution and growth mechanism of hard phase in surfacing layer were studied. The reasons for the increasing of abrasion resistance and surface hardness were discussed as well. The results show that the alloy elements of flux cored wire could effectively translate into surfacing layer, in-situ synthesis of (Fe,Cr)7C3 and TiC hard phase were obtained. TiC preferentially nucleated and grew up by attaching to external interface, the nucleation and growth of eutectic (Fe,Cr)7C3 hard phase was dependent on the primary martensite phase and TiC. Most of TiC hard phase was punctate, the minority was the strip and cross shaped. They dispersed in the matrix of martensite, and formed composite hard phase with (Fe,Cr)7C3, which could significantly improve the wear resistance of the surfacing layer. |
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