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采用等离子熔覆技术在Q235钢基体上制备了fcc结构的Co Cr Cu Fe Ni Mn高熵合金熔覆层,并研究了熔覆层的组织结构以及合金元素在基体中的扩散。结果发现,熔覆层显微组织为树枝晶,枝晶间为富Cu面心立方固溶体,晶格常数为0.3597 nm,有纳米编织组织析出。枝晶内为多种元素固溶的面心立方固溶体,晶格常数为0.3664 nm。高熵组元元素在熔合线靠近热影响区一侧形成元素的过渡区,过渡区宽度约为10μm。临近熔合线的热影响区内出现了大约70μm宽的铁素体带,该区域的珠光体因脱碳分解生成铁素体,Co在该区域扩散的距离最远。
The cladding structure of CoCuCuFeNiMn high-entropy alloy with fcc structure was prepared on Q235 steel by plasma cladding technique. The microstructure and the diffusion of alloying elements in the matrix were studied. The results show that the microstructure of the cladding layer is dendrite, and the dendrite is Cu-rich face-centered cubic solid solution with a lattice constant of 0.3597 nm, which is precipitated by nano-braided structure. Dendrite solution for the various elements of the face-centered cubic solid solution, the lattice constant of 0.3664 nm. The high entropy group element forms the transition zone of the element near the heat affected zone on the fusion line, and the width of the transition zone is about 10 μm. In the HAZ adjacent to the fusion line, a ferrite band approximately 70 μm wide appears. The pearlite in this zone is decomposed to form ferrite by decarbonization. Co diffuses most far in this zone.