GH901基体表面等离子喷焊司太立6#合金层的组织与性能研究

随着汽轮机设计参数的日趋提升,对高温材料及相关的表面改性技术的需求也日趋强烈。GH901材质及其氮化、熔覆的零部件也广泛地应用于抗高温氧化、耐高温磨损的工况。通过使用等离子喷焊(PTA)方式,在GH901材质上进行单层或双层喷焊司太立合金试验,研究了焊接单层及双层司太立合金对焊接接头热影响区组织性能的影响。结果表明,采用PTA方式进行堆焊司太立时,接头熔合线处易形成较大的成分扩散区,且在扩散区晶界及晶内产生大量的TiC等析出相,且随着两层焊接热循序,焊层与基体间的扩散区宽度增大,析出相的数量和尺寸均增加。

Study on microstructure and properties of Stellite 6#alloy layer by plasma spray welding on GH901 substrate

With the improvement of design parameters of steam turbine,the demands for high-temperature materials and related surface modification technology are becoming increasingly strong.GH901 material and its nitriding and cladding parts are also widely used in high temperature oxidation resistance and high temperature wear resistance working conditions.In this paper,plasma spray welding(PTA)is used to test stellite alloy on GH901.The effect of welding single and double stellite alloy on the microstructure and properties of the HAZ of the welded joint is studied.The results show that when using PTA method to weld Stellite,a large diffusion area of components is easy to form at bond line of the joint,and a large number of precipitates such as TiC are produced in the grain and at the grain boundary of the diffusion area.With the welding heat sequence of the two layers,the width of the diffusion area between the welding layer and the matrix increases,and the number and size of precipitates also increase.