| 摘要: |
| 为解决水泥、电力、冶金、矿山等行业立磨、辊压机、耐磨板等耐磨部件的耐磨损问题，对铁基硬面堆焊药芯焊丝进行了研究。通过调整药芯焊丝中碳、铬含量以及一种或多种强化合金元素种类与含量，制备了碳含量4%~6%，铬含量20%~35%，其他合金元素含量小于10%的铁基硬面堆焊合金，分析了堆焊合金显微组织和硬度，对合金中硬质碳化物面积百分比、碳化物尺寸进行了定量分析，对堆焊合金的耐磨性进行了试验。结果表明：堆焊合金的主要组织为初生碳化物(Cr，Fe)7C3、共晶碳化物(Cr，Fe)7C3、残余奥氏体及少量其他碳化物；随合金中初生碳化物的增加，合金硬度和耐磨性增加，但碳化物过多时，硬度继续增加，耐磨性反而下降；适量合金元素Nb、Mo等的加入，在合金中以固溶体和细小弥散分布的硬质相的形式存在，有利于提高合金的耐磨性。通过配方设计和应用试验，成功开发出6种硬面堆焊用药芯焊丝。 |
| 关键词: 铁基硬面堆焊 高碳 高铬 耐磨损 药芯焊丝 |
| DOI：10.3969/j.issn.1007-9289.2014.03.015 |
| 分类号: |
| 基金项目: |
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| Development and Application of Ironbased Hardfacing Flux-cored Wire |
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LIU Zhenying, ZHANG Li
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Beijing ARC Xinxing Science and Technology Co., Ltd., Beijing 100084
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| Abstract: |
| To solve the wear resistance of wear parts involving vertical mill, squeeze roller, and wear resistant plate used in cement, power, and metallurgical and mining industries, the ironbased fluxcored wire for hardfacing was developed. The hardfacing alloys with carbon (4%6%), chromium (20%35%) and other alloy elements of no more than 10% were prepared with the method of overlaying welding by designing different proportion of graphite, chromium carbideiron powder and some additive agents of fluxcored wire. The microstructure and hardness of hardfacing alloy were tested and analyzed. The percentage of area and size of carbides in hardfacing alloy were determined. The wear resistance of alloys was evaluated. The results show that the microstructures of hardfacing alloys consist of primary carbide(Cr，Fe)7C3, eutectic carbide(Cr，Fe)7C3, residual austenite and other trace amount of carbide. The more the amount of primary carbides is, the higher the hardness of hardfacing alloys is. The mass loss increases first, and then decreases. Proper additional elements such as Nb, and Mo can improve wear resistance of hardfacing alloy by forming solid solutions and producing fine and dispersed hard carbides. Six types of fluxcored wires are successfully developed by designing and expermenting. |
| Key words: ironbased hardfacing high carbon high chromium microstructure wear resistance fluxcored wire |
