摘要
通过激光熔覆在304不锈钢表面制备了Stellite 12涂层,研究了添加不同质量分数的Ti/B_4C对Stellite 12涂层组织及性能的影响,分析了涂层组织的生长,测试了涂层的显微硬度及耐磨性能。研究结果表明,Stellite 12涂层主要由面心立方的γ-Co与Cr_7C_3相组成。随着Ti/B_4C的添加,涂层原位合成了TiC亚微米颗粒相。残存的B_4C作为异质形核点,形成了亚微米结构TiC/B_4C强化相,且颗粒尺寸逐渐减小。TiC/B_4C颗粒对涂层晶粒有细化作用。涂层显微硬度随着添加Ti/B_4C的质量分数的增加逐渐增大,最高为624 HV。涂层耐磨性能随添加的Ti/B_4C质量分数的增加逐渐增强。
The Stellite 12 coating is synthetized on the 304 stainless steel surface by laser cladding,and the effect of the addition of Ti/B4C with different contents on the microstructure and properties of the Stellite 12 coating is discussed.The microstructural growth of the coating is analyzed,and the microhardness and wear resistance of the coating are also tested.The research results show that the Stellite 12 coating is mainly composed of face-centered cubeγ-Co and Cr7C3 phases.The in-situ TiC sub-micron particle phase is synthesized with the addition of Ti/B4C.The remaining B4C acts as a heterogeneous nucleation point,and thus a TiC/B4C strengthening phase with sub-micron structure is formed and the particle size gradually decreases.The TiC/B4C particles have an obvious grain refinement effect on the coating.The micro-hardness of the coating gradually increases with the addition of Ti/B4C with the maximum value of 624 HV.In addition,the wear resistance of the coating gradually increases with the addition of Ti/B4C.
作者
何珊珊
于治水
张培磊
李明川
闫华
李绍伟
He Shanshan;Yu Zhishui;Zhang Peilei;Li Mingchuan;Yan Hua;Li Shaowei(School of Materials Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Collaborative Innovation Center of Laser Advanced Manufacturing Technology y Shanghai 201620,China)
出处
《中国激光》
EI
CAS
CSCD
北大核心
2019年第3期93-99,共7页
Chinese Journal of Lasers
基金
国家自然科学基金(51605276)
上海市"创新行动计划"基础研究领域项目(17JC1400600
17JC1400601)
上海汽车工业科技发展基金会(1604)
