| 共晶碳化物团球化对铸铁激光熔敷层抗裂性的影响 |
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| 引用本文： | 栾景飞,周振丰,胡建东,严密.共晶碳化物团球化对铸铁激光熔敷层抗裂性的影响[J].材料科学与工艺,2002,10(1):41-44. |
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| 作者姓名： | 栾景飞 周振丰 胡建东 严密 |
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| 作者单位： | 1. 浙江大学材料科学与工程系,浙江,杭州,310027
2. 吉林大学,材料科学与工程学院,吉林,长春,130025 |
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| 基金项目： | 国家自然科学基金(50171065)，教育部博士后基金(2000033507)，留学归国人员基金([2000]367) |
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| 摘 要： | 为提高铸铁表面大面积激光熔敷层抗裂性问题，通过冶金因元素控制熔敷层组织形态在熔敷材料中加入碱金属元素钾，研究了在激光快速加热条件下钾对铸铁激光熔敷层组织团球化的影响，进而分析了该球状组织对熔敷层抗裂性的影响，结果表明随熔敷金属内钾含量增多熔敷层内共晶碳化物组织呈球状及孤岛状，这种组织明显提高了熔敷层抗裂性，此外大量的渗碳体组织确保了熔敷层具有较高的耐磨性；获得了无裂纹的大面积搭接熔敷层，其对应合金系统为Fe-C-Si-Ni-K。
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| 关 键 词： | 共晶碳化物 团球化 激光熔敷层 裂纹 铸铁 抗裂性 表面处理 |
| 文章编号： | 1005-0299(2002)01-0041-04 |
| 修稿时间： | 2001年1月12日 |
Effect of nodulation of eutectic carbides on crack resistance of laser-clad layers on cast iron |
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| LUAN Jing-fei ,ZHOU Zhen-feng ,HU Jian-dong ,YAN Mi.Effect of nodulation of eutectic carbides on crack resistance of laser-clad layers on cast iron[J].Materials Science and Technology,2002,10(1):41-44. |
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| Authors: | LUAN Jing-fei ZHOU Zhen-feng HU Jian-dong YAN Mi |
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| Affiliation: | LUAN Jing-fei 1,ZHOU Zhen-feng 2,HU Jian-dong 2,YAN Mi 1 |
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| Abstract: | Potassium was added into the Baser cladding material with a special method.The nodulation effect of potassium on the microstructures of laser-clad layers on cast iron was investigated under rapid laser heating conditions.The effect of nodula tion on the crack resistance of clad layer was analyzed.It was shown that with increasing potassium content the eutectic carbides are nodulated and isolated,which enhanced the crack re-sistance of the cladding layers.As a result,large areas of overlapped clad layers are free from cracks.Fur ther-more,the wear resistance of clad layer was improved due to the presence of large contents of cementite. |
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| Keywords: | Eutectic carbides nodulating laser-cladding layer crack cast iron |
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