激光熔覆FeAlCrNiSix高熵合金涂层的显微组织与耐蚀性能
Microstructure and corrosion resistance of laser cladding FeAlCrNiSix high entropy alloy coating
尹燕 1茹恩光 1刘鹏宇 2吴怡霖 1宋曜祥 1张瑞华 2魏小红3
作者信息
- 1. 兰州理工大学 省部共建有色金属先进加工与再利用国家重点实验室,兰州 730050
- 2. 中国钢研科技集团有限公司,北京 100081;阳江市五金刀剪产业技术研究院,阳江 529533
- 3. 阳江市五金刀剪产业技术研究院,阳江 529533
- 折叠
摘要
采用激光熔覆技术在DH36高强度海洋工程结构用钢表面制备不同Si元素添加量的FeAlCrNiSix高熵合金熔覆层,进一步提升海洋结构用钢的耐蚀性能.采用X射线衍射仪(XRD)、光学显微镜(OM)和扫描电子显微镜(SEM)分析高熵合金熔覆层的物相组成和显微组织.测量熔覆层显微硬度,利用极化曲线分析了熔覆层的腐蚀行为.结果表明:Si元素的添加促使熔覆层的物相由FCC+BCC相转变为单一的BCC相,枝晶尺寸逐渐减小,最终完全转化为形状不规则的等轴晶,熔覆层的平均硬度先上升后下降,硬度最高值为430.15HV0.1.Si元素的加入也有效改善了熔覆层的耐蚀性能,熔覆层的耐蚀性能随着Si元素添加量的增多呈现先增强后降低的趋势.综合考虑电化学参数,FeAlCrNiSi0.25熔覆层的耐蚀性能最好.
Abstract
FeAlCrNiSix high-entropy alloy cladding layers with different Si content were prepared on the surface of DH36 high-strength ocean structural steel by laser cladding technology to further improve the corrosion resistance of ocean structural steel.The phase composition and microstructure of the high entropy alloy cladding layer were analyzed by X-ray diffraction(XRD),optical microscope(OM)and scanning electron microscope(SEM).The microhardness of cladding layer was measured and the corrosion behavior of cladding layer was analyzed by polarization curve.The results show that the addition of Si elements can change the phase of the cladding layer from FCC+BCC phase to a single BCC phase,and the dendrite size gradually decreases and finally completely transforms into irregularly shaped equiaaxial crystals.The average hardness of the cladding layer increases first and then decreases,and the highest hardness value is 430.15HV0.1.The addition of Si element also effectively improves the corrosion resistance of the cladding layer,and the corrosion resistance of the cladding layer increases and then decreases with the increase of Si element addition.Considering the electrochemical parameters,FeAlCrNiSi0.25 cladding layer has the best corrosion resistance.
关键词
激光熔覆/高熵合金/显微组织/耐蚀性能Key words
laser cladding/high entropy alloy/microstructure/corrosion resistance引用本文复制引用
基金项目
国家自然科学基金(52161007)
广东省科技计划(20170902)
广东省科技计划(20180902)
阳江市科技计划(SDZX2020063)
深圳市创新创业计划技术攻关重点项目(JSGG20210420091802007)
云浮市科技计划(2023)(S2023020201)
出版年
2024
NETL
NSTL
维普
万方数据