[1]童 健,朱志雄,刘爱军,等.球墨铸铁表面堆焊Inconel 625高温合金的微观组织与性能[J].焊管,2021,44(11):17-22.[doi:10.19291/j.cnki.1001-3938.2021.11.003]
　TONG Jian,ZHU Zhixiong,LIU Aijun,et al.Microstructure and Mechanical Properties of Surfacing Inconel 625 Superalloy on Ductile Cast Iron[J].,2021,44(11):17-22.[doi:10.19291/j.cnki.1001-3938.2021.11.003]
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球墨铸铁表面堆焊Inconel 625高温合金的微观组织与性能()
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《焊管》[ISSN:1001-3938/CN:61-1160/TE]

卷:
第44卷
期数:
2021年第11期
页码:
17-22
栏目:
试验与研究
出版日期:
2021-11-28

文章信息/Info

Title:
Microstructure and Mechanical Properties of Surfacing Inconel 625 Superalloy on Ductile Cast Iron
文章编号:
10.19291/j.cnki.1001-3938.2021.11.003
作者:
童 健; 朱志雄; 刘爱军; 钟志宏; 宋奎晶
合肥工业大学 材料科学与工程学院，合肥 230009
Author(s):
TONG Jian;  ZHU Zhixiong;  LIU Aijun;  ZHONG Zhihong; SONG Kuijing
School of Materials Science and Engineering, Hefei University of Technology, Hefei 230009, China
关键词:
球墨铸铁; 冷金属过渡焊; 熔覆层; Inconel 625合金
Keywords:
ductile cast iron;  cold metal transfer;  cladding layer;  Inconel 625 superalloy
分类号:
TG455
DOI:
10.19291/j.cnki.1001-3938.2021.11.003
文献标志码:
A
摘要:
为了改善球墨铸铁的耐蚀性能，采用冷金属过渡焊(CMT)工艺，在球墨铸铁表面熔覆了一层厚度为2～3 mm的Inconel 625高温合金涂层，采用光学显微镜、扫描电子显微镜、X射线衍射分析和EDS能谱等方法对试样截面的组织结构进行了表征，并对堆焊试样截面的显微硬度和界面结合性能等进行了研究。结果表明，部分熔化区（PMZ）为莱氏体和马氏体组织及少量未完全溶解的石墨相，而热影响区（HAZ）由珠光体和少量马氏体组织组成，熔覆层组织从熔合线至表面依次为胞状晶、柱状晶、树枝晶和等轴晶组织，相邻两道焊缝间存在重熔的均匀等轴晶区。界面区基本未发生明显的元素扩散迁移，稀释率小。熔覆层显微硬度明显高于基体，界面结合强度高于380 MPa，剪切断口形貌分析表明，断裂机制为脆性和韧性混合断裂；熔覆层耐腐蚀性高于基体。
Abstract:
In order to improve the wear resistance and corrosion resistance of ductile cast iron, a layer of Inconel 625 superalloy coating with thickness of 2~3 mm was coated on the surface of ductile cast iron by cold metal transfer (CMT) welding, the microstructure of the cross section was characterized by optical microscope, scanning electron microscope, X-ray diffraction analysis and EDS, and the microhardness and interfacial bonding properties of the cross section were studied. The results show that the partial melting zone (PMZ) is composed of ledeburite, martensite and a small amount of incompletely dissolved graphite, while the heat affected zone (HAZ) is composed of pearlite and a small amount of martensite. The microstructure of cladding layer from fusion line to surface is cellular crystal, columnar crystal, dendrite and equiaxed crystal, and there is uniform equiaxed crystal zone of remelting between two adjacent welds. There is no obvious element diffusion and migration in the interface area. The microhardness of the cladding layer is obviously higher than that of the substrate, and the interfacial bonding strength is higher than 380 MPa. The analysis of shear fracture morphology shows that the fracture mechanism is brittle and ductile mixed fracture. The corrosion resistance of cladding layer is higher than that of substrate.

参考文献/References:

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备注/Memo

备注/Memo:
收稿日期：2021-07-22基金项目： 安徽省自然科学基金项目“Zn对AA5083铝合金FSW接头应力腐蚀的影响机理研究”（项目编号1808085QE136）。作者简介：童 健（1996—），男，硕士研究生，主要研究方向为堆焊工艺与组织性能。
更新日期/Last Update: 2021-12-09