YU Hui, XING Li, KE Liming. Effect of cooli ng conditions on microstructure and properties of plasma arc spray welding cladding layer of DZ125 alloy[J]. 2021,51(5):42-48. DOI： 10.7512/j.issn.1001-2303.2021.05.08.
为了实现定向凝固DZ125合金高效、高质量的等离子熔覆,在通水冷却的条件下,利用等离子弧喷焊在DZ125合金表面制备Eu Tro Loy16006钴基合金粉末熔覆层,研究不同冷却条件对熔覆层组织生长与硬度的影响。结果表明,熔覆层在基材的结合界面处形成的是外延生长的细小柱状晶组织,随着熔覆层厚度增加,组织由柱状晶向等轴晶转变。水冷条件下柱状晶的生长高度高于空冷条件下的。柱状晶的硬度与基材相近,等轴晶硬度低于柱状晶,接近熔覆层表面的等轴晶硬度最低,水冷条件下得到比空冷条件更宽的、与基材硬度一致的熔覆层。
In order to achieve high efficiency and high quality plasma cladding of directionally solidified DZ125 alloy,under the condition of water cooling,Eu Tro Loy16006 Co-based alloy powder cladding layer is prepared on the surface of DZ125 alloy by plasma arc spray welding to study the effect of different cooling conditions on the microstructure growth and hardness of cladding layer. The results show that the fine columnar crystal microstructure forms at the bonding interface of the base material,and the microstructure changes from columnar crystal to equiaxed crystal when the cladding layer thickness increases.The growth height of columnar crystal under water cooling condition is higher than that under air cooling condition. The hardness of the columnar crystal is similar to that of the base material,and the hardness of the equiaxed crystal is lower than that of the columnar crystal. The hardness of the equiaxed crystal close to the surface of the cladding layer is the minimum. The cladding layer with the same hardness as the base material obtained under the water cooling condition is wider than that under the air cooling condition.