| 激光工艺对45钢表面梯度熔覆层组织性能的影响 |
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| 引用本文： | 许妮君,刘常升,冯欣俣,孙挺.激光工艺对45钢表面梯度熔覆层组织性能的影响[J].东北大学学报(自然科学版),2019,40(4):495-499. |
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| 作者姓名： | 许妮君 刘常升 冯欣俣 孙挺 |
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| 作者单位： | 东北大学 材料各向异性与织构教育部重点实验室,辽宁 沈阳 110819;西安建筑科技大学 化学与化工学院,陕西 西安 710005;东北大学 材料各向异性与织构教育部重点实验室,辽宁 沈阳 110819;东北大学 激光应用技术与装备辽宁省重点实验室,辽宁 沈阳 110819;东北大学 理学院,辽宁 沈阳,110819 |
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| 基金项目： | 国家自然科学基金资助项目(U1508213， 51771051); 国家重点研发计划资助项目(2017YFB0305801). |
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| 摘 要： | 研究了激光熔覆功率、扫描速度和熔覆材料对熔覆层组织结构与耐磨性等的影响.结果表明:梯度熔覆层连续完整，无裂纹、气孔等缺陷，与45钢基体呈冶金结合状态.熔覆层显微组织特征为枝晶、等轴晶等多种形貌的快速凝固组织，由α-Fe，CrNiFe-C和Cr7C3等组成.熔覆层显微硬度呈梯度分布，表层硬度达7.48GPa，过渡层硬度达5.52GPa，分别是基体硬度的3.74和2.76倍.激光熔覆技术可显著提高45钢的耐磨性能.
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| 关 键 词： | 激光熔覆 梯度涂层 层流冷却辊 45钢 组织性能 |
| 收稿时间： | 2018-06-10 |
| 修稿时间： | 2018-06-10 |
Effects of Laser Cladding Parameters on Microstructure and Properties of Gradient Cladded Coating on 45# Steel |
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| XU Ni-jun,LIU Chang-sheng,FENG Xin-yu,SUN Ting.Effects of Laser Cladding Parameters on Microstructure and Properties of Gradient Cladded Coating on 45# Steel[J].Journal of Northeastern University(Natural Science),2019,40(4):495-499. |
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| Authors: | XU Ni-jun LIU Chang-sheng FENG Xin-yu SUN Ting |
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| Institution: | 1.Key Laboratory for Anisotropy and Texture of Materials， Ministry of Education， Northeastern University， Shenyang 110819， China; 2. College of Chemistry and Chemical Engineering， Xi’an University of Architecture and Technology， Xi’an 710005， China; 3.Key Laboratory for Laser Application Technology and Equipment of Liaoning Province， Northeastern University， Shenyang 110819， China; 4. School of Sciences， Northeastern University， Shenyang 110819， China. |
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| Abstract: | The effects of laser cladding power， scanning speed and cladding materials on the microstructure and wear resistance of the cladded coating on 45# steel were investigated. The results show that the gradient cladded layer is continuous without the defects of crack pores and is metallurgically bonded to the 45# steel matrix.The microstructure of the cladded layer are characterized by dendritic crystals， equiaxed crystals and other rapid solidification structures， which is composed of α-Fe， CrNiFe-C and Cr7C3. The microhardness of the cladded layer is gradient， and the surface hardness of the cladded layer and the transition layer are 7.48GPa and 5.52GPa， respectively， which is 3.74 and 2.76 times of the hardness of the substrate.Therefore， the laser cladding technology can significantly improve the wear resistance of 45# steel. |
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| Keywords: | laser cladding gradient coating laminar flow cooling roll 45# steel microstructure and properties |
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