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| 球墨铸铁表面电弧增材制造Fe‒Cr合金结合区组织和性能 |
| Microstructure and Property of Bonding Zone of Fe-Cr Alloy Prepared by Arc Additive Manufacturing on Nodular Cast Iron |
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| DOI：10.3969/j.issn.1674-6457.2023.02.013 |
| 中文关键词: 球墨铸铁 电弧增材制造 Fe-Cr合金 结合区 微观组织 |
| 英文关键词: nodular cast iron arc additive manufacturing Fe-Cr alloy bonding zone microstructure |
| 基金项目: |
| Author Name | Affiliation | | HE Zhong-pu | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China | | ZENG Da-xin | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China | | SHI Qiu-yue | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China | | ZHAO Hong-li | School of Materials Science and Engineering, Hubei University of Automotive Technology, Hubei Shiyan 442002, China |
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| 中文摘要: |
| 目的 在球墨铸铁基体上电弧增材制造Fe-Cr合金，研究结合区组织和性能，以期获得具有良好冶金结合、满足冲裁模具性能要求的双金属构件。方法 采用GMAW工艺增材制造，用金相显微镜和扫描电子显微镜表征结合区的显微组织，并分析其形成机制。结果 Fe-Cr合金与球墨铸铁结合区无明显裂纹和气孔，其凝固组织为柱状晶和等轴晶，冷却后转变为马氏体和残余奥氏体，但其分布不均匀，在界面处有一富奥氏体层。结合区内球墨铸铁受热影响发生奥氏体化和部分熔化，熔化发生在临近结合界面的石墨球周围，其冷却后形成一层马氏体和一层莱氏体的双层壳型组织结构，未熔化部位的组织为马氏体和铁素体，珠光体球墨铸铁比铁素体球墨铸铁形成的马氏体多。结合区内硬度分布不均匀，球墨铸铁的硬度从基材到结合界面逐渐升高，最高达630HV，Fe-Cr合金平均硬度为510HV。结论 电弧增材制造Fe-Cr合金与球墨铸铁基体冶金结合良好，Fe-Cr合金组织为马氏体和残余奥氏体，有较高的硬度，能满足冲裁模具的性能要求。 |
| 英文摘要: |
| The work aims to prepare Fe-Cr alloy by arc additive manufacturing on nodular cast iron substrate, and study the microstructure and property of the bonding zone, in order to obtain bimetallic components with good metallurgical bonding that can meet the performance requirements of blanking die. GMAW process was used for additive manufacturing. The microstructure of the bonding zone was characterized by optical microscope and scanning electron microscope, and its formation mechanism was analyzed. There were no obvious cracks and pores in the bonding zone of Fe-Cr alloy and nodular cast iron. The solidification structure of Fe-Cr alloy was columnar crystal and equiaxed crystal, which transformed into martensite and retained austenite after cooling, but the distribution was uneven and there was an austenite-rich layer at the interface. The nodular cast iron in bonding zone was austenitized and melted partially by heat effect. Melting occurred at the place around the nodular graphite near interface and the melted metal transformed to a double-layer shell structure of martensite and ledeburite around the nodular graphite after cooling. The unmelted metal existed as martensite and ferrite and there was more martensite formed in pearlite nodular cast iron than ferritic nodular cast iron. The hardness distribution in the bonding zone was uneven. The hardness of nodular cast iron increased gradually from substrate to bonding interface, up to 630 HV, and the average hardness of Fe-Cr alloy was 510 HV. Fe-Cr alloy with good metallurgical bonding with nodular cast iron can be prepared by arc additive manufacturing and its microstructure is composed of martensite and retained austenite with high hardness, which can meet the performance requirements of blanking die. |
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