激光熔覆原位合成陶瓷相增强铁基熔覆层的组织和性能
Microstructure and properties of in-situ synthesized ceramic phase reinforced Fe-based coating by laser cladding
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摘要: 利用6 kW光纤激光器在Cr12MoV汽车模具钢表面激光熔覆含有Ti-Fe,B4C粉末的铁基合金粉,在汽车模具钢表面直接原位合成TiC+TiB2颗粒增强的铁基合金复合涂层.涂层与基体呈良好的冶金结合,涂层组织细小,结构致密,宏观质量较好. XRD分析结果表明,涂层组织由α-Fe,TiC,TiB2组成. TiC,TiB2相均匀分布于熔覆层中.由于TiC,TiB2硬质相的形成以及激光的快速凝固冷却获得的细晶组织,使得熔覆层的显微维氏硬度有了明显提高.在距离熔覆层表面1.2 mm处显微维氏硬度高达1000 HV,有利于促进熔覆层耐磨性的提高.Abstract: Laser cladding include Ti-Fe,B4C Fe-based alloy coating was fabricated on the surface of Cr12MoV automotive mold steel by using 6 kW fiber laser, in-situ synthesized TiC+TiB2 ceramic phase reinforced Fe-based coating on the surface of Cr12MoV automotive mold steel. The gains are refined. Phases were presented in the coating evolved into TiB2, TiC and α-Fe. Dese and defect-free coating with metallurgical joint to the substrate was obtained. Cladding layer 1.2 mm from the surface of the highest microhardness is up to 1000 HV.
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