陈翔,张德强,孙文强,王一臣,张吉庆.M2高速钢刀具表面激光熔覆WC/Co涂层的组织与红硬性[J].表面技术,2019,48(11):236-243.
CHEN Xiang,ZHANG De-qiang,SUN Wen-qiang,WANG Yi-chen,ZHANG Ji-qing.Microstructure and Red Hardness of WC/Co Coating on M2 High-speed Steel Cutter Surface Prepared by Laser Cladding[J].Surface Technology,2019,48(11):236-243 |
| M2高速钢刀具表面激光熔覆WC/Co涂层的组织与红硬性 |
| Microstructure and Red Hardness of WC/Co Coating on M2 High-speed Steel Cutter Surface Prepared by Laser Cladding |
| 投稿时间：2019-02-02 修订日期：2019-11-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2019.11.025 |
| 中文关键词: 激光熔覆 M2高速钢 WC/Co粉末 红硬性 显微组织 显微硬度 |
| 英文关键词:laser cladding M2 high-speed steel WC/Co powders red hardness microstructure microhardness |
| 基金项目:辽宁省自然科学基金优秀人才培育项目（2015020170）；辽宁教育厅项目（L2015231） |
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| Author | Institution |
| CHEN Xiang | 1. a. Engineering Training Center, Liaoning University of Technology, Jinzhou 121001, China |
| ZHANG De-qiang | 1. b. School of Mechanical Engineering and Automation, Liaoning University of Technology, Jinzhou 121001, China |
| SUN Wen-qiang | 1. a. Engineering Training Center, Liaoning University of Technology, Jinzhou 121001, China |
| WANG Yi-chen | 2.Wonder Auto Group Limited, Jinzhou 121000, China |
| ZHANG Ji-qing | 3.Shandong Steel Rizhao Fine Steel Base, Rizhao 276800, China |
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| 中文摘要: |
| 目的 利用激光强化技术在M2（W6Mo5Cr4V2）高速钢刀具表面熔覆WC/Co涂层，研究涂层组织成分、切削性能的变化规律及强化机理。方法 采用IPG光纤激光器，在通用M2高速钢刀具表面制备一组单道熔覆层，运用显微硬度计、扫描电镜（SEM）、能谱仪（EDS）、X射线衍射仪（XRD）等表征手段分析了熔覆层显微硬度、宏观形貌、显微组织、物相组成及红硬性等情况。结果 在激光功率为1.1 kW，送粉电压为14 V，扫描速度为3 mm/s时，熔覆层截面出现少量气孔，并在左右边界部位出现裂纹，主要物相为Fe3W3C、WC、W2C、M6C型硬质相和间隙碳化物。其上部组织更为细腻，以碳化钨和钨钴化合物为主；中部及下部组织以弥散形式分布于熔覆层中，主要组织为Fe3W3C和碳化钨。熔覆层硬度明显高于基体，最高硬度达到1411HV，出现在距熔覆层顶点0.4 mm左右的次表层范围内。600 ℃时，熔覆层红硬性达到60HRC以上；1000 ℃时，熔覆层红硬性仍达到50HRC以上。由600 ℃逐渐升高到1000 ℃时，熔覆层组织晶界强化作用逐渐减小，择优取向强化表现明显。结论 在M2高速钢表面熔覆WC/Co涂层，可以有效地提高刀具材料的硬度及红硬性。熔覆层最高硬度可以提高为刀具基体的1.64倍；600 ℃时，熔覆层红硬性远高于高速钢基材的红硬性指标；1000 ℃时，熔覆层红硬性近似接近于硬质合金的红硬性要求，是高速钢基材的2.94倍。生成的碳化物硬质相及间隙碳化物对熔覆层的硬度及红硬性的提高起到了主要作用。 |
| 英文摘要: |
| The work aims to study the change rules of microstructure and cutting properties and the strengthening mechanism of WC/Co coating on the surface of M2 (W6Mo5Cr4V2) high-speed steel cutter by laser strengthening technique. A series of single-pass cladding layers were fabricated on the surface of common M2 HSS cutter by IPG fiber laser system. The microhardness, macro-morphology, microstructure, phase composition and red hardness of the cladding layer were analyzed by the microhardness tester, scanning electron microscope (SEM), energy disperse spectrometer (EDS) and X-ray diffraction (XRD). When the laser power was 1.1 kW, the powder feeding voltage was 14 V and the scanning speed was 3 mm/s, a few pores appeared at the cross section of the cladding layer and the cracks appeared at the left and right boundaries. The main phases were Fe3W3C, WC, W2Cb and M6C hard phases and interstitial carbides. The upper structure was finer and mainly composed of the tungsten carbide and the tungsten-cobalt compound. The middle and lower tissues were distributed in the cladding layer in the form of dispersion and the main structures were Fe3W3C and tungsten carbide. The microhardness of the cladding layer was obviously higher than that of the substrate, and the highest microhardness reached 1411HV, which appeared in the sub-surface area of about 0.4mm from the apex of the cladding layer. The red hardness of the cladding layer reached more than 60HRC at 600 ℃, and it reached more than 50HRC at 1000 ℃. When the temperature increased from 600 ℃ to 1000 ℃, the grain boundary strengthening of the cladding layer decreased gradually after red hardness, and the preferred orientation strengthening was obvious. Cladding WC/Co coating on the surface of M2 HSS can effectively improve the microhardness and red hardness of the cutter material. The maximum microhardness of cladding layer can be increased by 1.64 times as much as that of the cutter substrate, the red hardness is much higher than that of the HSS substrate at 600 ℃ and the red hardness is close to the requirement of cemented carbide at 1000 ℃, which is 2.94 times higher than that of the substrate. The carbide hard phase and gap carbides play major roles in improving the microhardness and red hardness of the cladding layer. |
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