中国激光, 2018, 45 (3): 0302006, 网络出版: 2018-03-20   

宽带激光熔覆铁基非晶涂层的微观组织及形成机制 下载: 799次

Microstructures and Formation Mechanism of Fe-Based Amorphous Coatings by Broad-Band Laser Cladding
作者单位
中国石油大学(华东)机电工程学院, 山东 青岛 266580
摘要
采用宽带激光熔覆技术,在304L不锈钢表面制备了Fe-Cr-Si-P非晶涂层,分析了涂层的组织结构及形成机制,建立了激光熔覆物理和数学模型,得到了熔池沿深度方向的温度梯度及冷却速率的变化规律。结果表明,涂层微观组织的界面区是平面晶和外延生长树枝晶,中部区域为非晶区,表面为梅花状树枝晶区。凝固过程中,从熔池底部到表面的温度梯度逐渐减小,冷却速率逐渐增大。结合凝固理论,建立了涂层组织特征与形状控制因子及冷却速率的关系模型。
Abstract
The Fe-Cr-Si-P amorphous coatings are prepared on the 304L stainless steel surface by using the broad-band laser cladding technique. The microstructures and formation mechanism of these coatings are analyzed. The mathematical and physics models of laser cladding are established, and the change rules of temperature gradient and cooling rate of molten pool along the depth direction are obtained. The results show that the microstructures of the coating are planar crystalline and epitaxial growth dendrites in the bonding zone, amorphous character in the middle zone and fine equiaxed crystalline on the surface. During the solidification process, the temperature gradient from the bottom to the surface for the molten pool decreases and the cooling rate increases gradually. Based on the rapid solidification theory, the model of the relationship between the coating microstructure character and the shape control factor as well as that between the coating microstructure character and the cooling rate is established.

王彦芳, 李豪, 孙旭, 宋增金, 李娟, 石志强. 宽带激光熔覆铁基非晶涂层的微观组织及形成机制[J]. 中国激光, 2018, 45(3): 0302006. Wang Yanfang, Li Hao, Sun Xu, Song Zengjin, Li Juan, Shi Zhiqiang. Microstructures and Formation Mechanism of Fe-Based Amorphous Coatings by Broad-Band Laser Cladding[J]. Chinese Journal of Lasers, 2018, 45(3): 0302006.

本文已被 4 篇论文引用
被引统计数据来源于中国光学期刊网
引用该论文: TXT   |   EndNote

相关论文

加载中...

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!