[1]娄丽艳,李成新,张 煜,等.低功率超高速激光熔覆FeCr合金薄涂层微观结构与表面形貌演化[J].燕山大学学报,2020,44(2):116-124.[doi:10.3969/j.issn.1007-791X.2020.02.003]
 LOU Liyan,LI Chengxin,ZHANG Yu,et al.Microstructure and surface morphology evolution of FeCr alloy thin coatings deposited by ultra-high speed laser cladding with low laser power[J].Journal of YanShan University,2020,44(2):116-124.[doi:10.3969/j.issn.1007-791X.2020.02.003]
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低功率超高速激光熔覆FeCr合金薄涂层微观结构与表面形貌演化
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《燕山大学学报》[ISSN:1007-791X/CN:13-1219/N]

卷:
44
期数:
2020年第2期
页码:
116-124
栏目:
机械工程
出版日期:
2020-03-31

文章信息/Info

Title:
Microstructure and surface morphology evolution of FeCr alloy thin coatings deposited by ultra-high speed laser cladding with low laser power
文章编号:
1007-791X(2020)02-0116-09
作者:
娄丽艳123李成新1*张 煜1李长久1田洪芳4澹台凡亮4
1. 西安交通大学 材料科学与工程学院,陕西 西安 710049;
2. 天津职业技术师范大学 天津市高速切削与精密加工重点实验室,天津 300222;
3. 天津职业技术师范大学 汽车模具智能制造技术国家地方联合工程实验室,天津 300222;
4. 山东能源重装集团大族再制造有限公司,山东 泰安 271222
Author(s):
LOU Liyan123 LI Chengxin1 ZHANG Yu1 LI Changejiu1 TIAN Hongfang4 TANTAI Fanliang4
1. College of Material Science and Engineering, Xi′an Jiaotong University, Xi′an, Shaanxi 710049, China;
2. Tianjin Key Laboratory of High Speed Cutting & Precision Machining, Tianjin University of Technology and Education, Tianjin 300222, China;
3. National local Joint Engineering Laboratory of Intelligent Manufacturing Oriented Automobile Die & Mould,Tianjin University of Technology and Education, Tianjin 300222, China;
4. Shandong Energy Heavy Equipment Group Dazu Remanufacturing Co. Ltd., Taian, Shandong 271222, Chin
关键词:
超高速激光熔覆涂层搭接率激光重熔表面形貌
Keywords:
ultra-high speed laser cladding coating overlapping ratio laser remelting surface morphology
分类号:
TG176
DOI:
10.3969/j.issn.1007-791X.2020.02.003
文献标志码:
A
摘要:
超高速激光熔覆涂层易出现表面粗糙的缺陷,熔覆后需精磨处理。明确涂层表面形貌演化机制,控制涂层表面粗糙度,是制备高质量涂层的关键。本文采用自行设计的超高速激光熔覆头,聚焦熔覆态涂层表面形貌演化,在1.5 kW激光功率,线速度147 mm/s下,制备了稀释率<2%,表面粗糙度Ra<10 μm的FeCr合金薄涂层,分析了粉末粒度、基体形貌、搭接率以及重熔激光功率对涂层表面形貌的影响。结果表明,受快速冷却影响,超高速激光熔覆涂层表面颗粒状特征明显,粉末粒径影响涂层表面质量;由于熔覆涂层稀释率低、过渡区小,基体表面形貌具有一定遗传特性,基体越粗糙,涂层表面粗糙度越大;提高搭接率可降低熔覆涂层表面高度差、改善涂层表面质量,搭接率超过70%,表面质量趋于平稳;在激光重熔作用下,熔覆涂层表面颗粒状特征逐渐消失,表面粗糙度值降低,重熔功率达0.7 kW后,变化不再显著。
Abstract:
The coating deposited by the ultra-high speed laser cladding process could produce a rough surface and, therefore, subsequent fine grinding becomes a necessary procedure. To prepare high quality coatings, it is critical to clarify the evolution mechanism of surface morphology to control the coating surface roughness. Focusing on surface morphology, FeCr alloy thin coating with dilution less than 2% and surface roughness Ra<μ10 m is deposited by ultra-high speed laser cladding process with home-designed powder feeding nozzle at 1.5 kW laser power and 147 mm/s linear speed. The effects of powder size, substrate morphology, overlapping ratio and remelting laser power on the surface morphology of the coatings are analyzed. The result shows that the coating has obvious granular characteristics due to the rapid cooling rate of the melting pool and, powder particle size markedly affects surface quality of the coating. Due to the low dilution, small transition zone, and memory effects of the substrate surface morphology, the rougher the substrate corresponds to the greater roughness of the coating surface. Increasing overlapping ratio can reduce height difference of the coating and improve its surface quality, while the surface roughness tends to be stable if the overlapping ratio exceeds 70%. Using laser remelting, the granular characteristics of the coating disappear gradually and the surface roughness reduces. No remarkable difference is observed when the remelting laser power is over 0.7 kW

相似文献/References:

[1]俞进辉,张一帆,魏博,等.梯度M7C3增强铁基堆焊涂层显微结构与耐磨性研究[J].燕山大学学报,2018,42(3):225.[doi:10.3969/j.issn.1007-791X.2018.03.006]
 YU Jinhui,ZHANG Yifan,WEI Bo,et al.Investigation on microstructure and abrasion resistance of gradient M7C3 reinforced arc hardfaced coatings[J].Journal of YanShan University,2018,42(2):225.[doi:10.3969/j.issn.1007-791X.2018.03.006]

备注/Memo

备注/Memo:
收稿日期:2019-10-15        责任编辑:温茂森
基金项目:国家重点研发计划资助项目(2018YFB2002000);天津市自然科学基金资助项目(19JCQNJC03800);天津市企业科技特派员项目(18JCTPJC68600)
作者简介:娄丽艳(1988-),女,内蒙古赤峰人,博士研究生,主要研究方向为激光增材制造;*通信作者:李成新(1974-),男,河北乐亭人,博士,教授,博士生导师,主要研究方向为防护与功能涂层,Email:licx@xjtu.edu.cn
更新日期/Last Update: 2020-04-22