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181904-718H 模具钢表面等离子熔覆Ni60A 镍基高温合金层的 微观组织形成温度特征与显微硬度分布

   日期:2018-11-06     作者:李蓝特,陈雨楠,等    浏览:24    评论:0    
核心提示:中文核心期刊,中国科技核心期刊! DOI: 10.19289/j.1004-227x.2018.19.004718H 模具钢表面等离子熔覆Ni60A 镍基高温合金层的微
 

中文核心期刊,中国科技核心期刊!


DOI: 10.19289/j.1004-227x.2018.19.004

718H 模具钢表面等离子熔覆Ni60A 镍基高温合金层的微观组织形成温度特征与显微硬度分布

李蓝特,陈雨楠,张天,胡永俊*,刘伟聪,肖小亭,刘岗,李风,成晓玲(广东工业大学材料与能源学院,广东 广州 510006)

摘要:在718H 模具钢表面等离子熔覆Ni60A 镍基高温合金层。采用金相显微镜、X 射线衍射和维氏硬度计考察了熔覆层的微观组织、相结构和显微硬度。利用ANSYS 有限元分析软件分析了等离子熔覆过程中Ni60A 合金层微观组织形成的温度场和温度梯度特征,讨论了熔覆层的形成条件与机制。实验结果表明,熔覆层亚层组织由表及里分别为细等轴晶、柱状晶、胞状晶和等轴晶。熔覆过程中的最高温度约为1 580 °C,最大温度梯度达1.6 × 106 °C/m,均出现在熔覆层表面。在熔覆和凝固过程中,表层呈现间隔的正温度梯度,熔覆层界面处则呈现负温度梯度。Ni60A 合金层的显微硬度在接近表面的区域最高(达508 HV),但在最表面稍低,越靠近基体则越低。

关键词:模具钢;镍基高温合金;等离子熔覆;微观组织;温度场;数值模拟;显微硬度

中图分类号:TG178; TG76 

文献标志码:A 

文章编号:1004 – 227X (2018) 19 – 0880 – 05

Characteristics of microstructure formation temperatures and microhardness distribution for Ni60A

nickel-based superalloy layer prepared by plasma cladding on 718H die steel surface // LI Lan-te, CHEN Yu-nan,

ZHANG Tian, HU Yong-jun*, LIU Wei-cong, XIAO Xiao-ting, LIU Gang, LI Feng, CHENG Xiao-ling

Abstract: A layer of Ni60A nickel-based superalloy was plasma clad on the surface of 718H die steel. Its microstructure,phase composition, and microhardness were examined using metallographic microscope, X-ray diffractometer, and Vickers hardness tester. The temperature field and temperature gradient characteristics corresponding to the formation of microstructures of the Ni60A alloy layer were studied by ANSYS finite element analysis software. The formation conditions and mechanism of the cladding layer were discussed. The experimental results showed that fine equiaxed crystal, columnar crystal, cellular crystal, and equiaxed crystal were formed in the cladding layer along the depth direction from the surface to the substrate. The maximum temperature reached about 1 580 °C in the cladding process, and the temperature gradient was up to 1.6 × 106 °C/m, both of which occurred at the surface of the cladding layer. During the process of cladding and solidification,the temperature gradient is positive at the surface, but negative at the cladding layer/substrate interface. The microhardness of the clad Ni60A alloy layer is as highest as 508 HV at the area adjacent to the surface, but lower at the outermost surface, and reduced when approaching the substrate.

Keywords: die steel; nickel-based superalloy; plasma cladding; microstructure; temperature field; numerical simulation;microhardness

First-author’s address: School of Materials and Energy, Guangdong University of Technology, Guangzhou 510006,China

PDF全文下载,请点击   1819004_0880-0884_175753.pdf

 
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