尹研,王匀,许桢英,於伟杰,李瑞涛,刘宏.基于激光填丝熔覆的Cr12MoV模具修复及性能表征[J].表面技术,2019,48(11):312-319.
YIN Yan,WANG Yun,XU Zhen-ying,YU Wei-jie,LI Rui-tao,LIU Hong.Repair and Characterization of Cr12MoV Dies Based on Laser Cladding by Wire[J].Surface Technology,2019,48(11):312-319 |
| 基于激光填丝熔覆的Cr12MoV模具修复及性能表征 |
| Repair and Characterization of Cr12MoV Dies Based on Laser Cladding by Wire |
| 投稿时间：2019-01-19 修订日期：2019-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.11.035 |
| 中文关键词: Cr12MoV 激光填丝熔覆 表面粗糙度 形貌特征 微观组织 显微硬度 |
| 英文关键词:Cr12MoV laser cladding with wire surface roughness clad geometry microstructure hardness |
| 基金项目:国家自然科学基金资助项目（51575245，51679112）；江苏省重点研发计划（BE2016161） |
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| Author | Institution |
| YIN Yan | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
| WANG Yun | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
| XU Zhen-ying | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
| YU Wei-jie | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
| LI Rui-tao | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
| LIU Hong | School of Mechanical Engineering, Jiangsu University, Zhenjiang 212013, China |
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| 中文摘要: |
| 目的 引入基体表面粗糙度作为激光填丝熔覆工艺参数，在Cr12MoV表面获得综合性能优良的熔覆层，研究激光功率、送丝速度、扫描速度和表面粗糙度对熔覆层形貌的影响。方法 利用Nd:YAG脉冲激光在Cr12MoV基体上熔覆SDK11丝材，用于修复模具表面损伤。利用光学显微镜、SEM和EDS对熔覆层、热影响区微观结构和化学组成进行表征，通过显微硬度仪获得熔覆层纵向硬度分布。结果 因为陷光效应，表面粗糙度对熔覆层形貌影响较大，随着粗糙度变大，激光吸收率提高，熔深和稀释率增加，高度降低。影响机理的本质是有效体能量Ev和比填丝率ω。当Ev为80~100 J/mm3、ω为1~3时，可获得较为稳定的熔覆工艺，熔覆层由胞状晶、柱状晶和等轴晶混合组成，并且晶粒细小，存在硬质铬钒碳化物，可使硬度提升900 HV，是基体的3倍。结论 Ev和ω可以作为关键控制工艺因素，在特定范畴内可以获得稀释率低的扁平熔覆层，熔合缺陷少，熔覆层硬度高，不存在明显软化区域。激光填丝熔覆可以达到模具表面缺陷修复的要求。 |
| 英文摘要: |
| The work aims to obtain the cladding layer with excellent comprehensive properties on Cr12MoV by introducing the surface roughness of substrate as a process parameter of laser cladding with wire, so as to study the effects of laser power, wire feeding speed, scanning speed and surface roughness on clad geometry. SKD11 steel wire was deposited on Cr12MoV plate by Nd:YAG pulsed laser to repair the die surface damage. The microstructure and chemical composition of cladded samples were characterized by optical microscope, SEM and EDS and the microhardness profiles was determined via the microhardness tester. From the experiment results, the surface roughness had significant impact on morphology of cladding layer due to the light trapping effect. With the increases of roughness, the laser absorption ratio was improved and both the clad depth and the dilution increased, but the height decreased. The essence of influence mechanism was the effective body energy Ev and the specific filling rate ω. When Ev was 80~100 J/mm3 and ω was 1~3, a relatively stable cladding process could be obtained. The cladding layer consisted of a mixture of cellular grain, columnar grain and equiaxed grain where the grains were fine and hard vanadium carbide particles existed. Thus, the surface hardness increased to 900 HV, 3 times over that of the base metal. Ev and ω can be used as key process factors. In the specific category of Ev and ω, a flat cladding layer with low dilution, less fusion defects, high hardness and no apparently softened zone can be obtained and laser cladding with wire meets the requirement of die repair. |
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